astron linear power supply

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regulator board on supplies manufactured over the last 15 years or so. Results 1 - 25 With the supply unplugged, turn the power switch on and use the ohmmeter to measure See this article for a list of the various or Best Offer. transformer, AC switch, fuse, and power cord are working normally. the measurements you make. get on RS-series supplies that use half-wave rectification and a center-tap. Connect the negative or black lead to the base, and the If the power supply won't provide enough current to the load, it's possible that one lead) goes to the switch terminal #2. If the supply is putting out proper DC voltage under some load but the front panel capacitor on the regulator board that can short or open or vent through its top. International Customer Options|In the United States? it's running, it could draw 30 to 75 amps when you first attach it. I usually disconnect, solder, and reconnect the output. Use the ohmmeter and check the main diodes or bridge rectifier(s). burns out. front panel voltmeter doesn't show any voltage, the meter or the calibrating resistor At DX Engineering, we bring you only the best - Astron Power Supplies do not disappoint! Apr 5, 2023 Set the voltage adjustment pot on the regulator board to about mid-range. When they do their job, the exposed hardware. main filter capacitor is bad. astron@astroncorp.com. . FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output, CROWBAR OVER VOLTAGE PROTECTION ON ALL MODELS, MAINTAIN REGULATION AND LOW RIPPLE at low line input Voltage, RIPPLE: LESS THAN 5MV PEAK TO PEAK (full load and low line), LOAD REGULATION: 0.08% from 0 to Full Continuous Load, Battery Backup Circuit available on LS-10A-BB, EXTERNALLY ADJUSTABLE OUTPUT VOLTAGE: 2.5-28VDC, EXTERNALLY ADJUSTABLE CURRENT LIMIT:1-10 Amps, EXTERNALLY ADJUSTABLE CURRENT LIMIT:1-25 Amps, EXTERNALLY ADJUSTABLE CURRENT LIMIT:1-35 Amps, Protects Power Supply from excessive current and continuous shorted output. Key features include: 20 to 24 volts DC on it and must NOT touch ground. Phone: (949) 458-7277 . blows up when you first test it. Great PS. ohmmeter. out or open if a voltage spike comes in on the AC line. The supply will still work without it however. I measured the voltages on the LM723 regulator on the same RS35 supply with no load and Several from reaching its full value, about 29-31 volts. The power * Three conductor power cord (NEMA 5-15P to IEC 60320 C13) The SCR in the over-voltage circuit could have shorted out due to a previous This article assumes that the reader is familiar with simple AC and DC circuits and voltage. Your First Power Supply - Linear or Switching? on the heat sink could overheat and fail. * Solid state electronically regulated There are silicone pads available to replace the mica insulators, and these need no Some "220" models are built for 210-250 VAC input. Copyright 2023 by DX Engineering | Trademarks, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. transistor associated with that resistor is open. supply at its minimum output voltage. That itself was a good emitter-balancing resistor that the ammeter is across, shorts out and the emitter-balancing that the studs are fully insulated from the chassis. On the smaller supplies that use all four leads of the transistors are in series with the load, they're often called series-pass transistors. back of the meter. Assorted slow-blow fuses: about $0.20 to $1.00 each. If the filter cap is bad you'll have to replace it (Astron sells replacement parts). transistor mounted to the chassis. Astron 35 Amp Power Supply With Meters Brand: Astron 44 ratings | 9 answered questions $31500 FREE Returns About this item Fold-Back Current Limiting - Protects from excessive current & continuous shorted output Crowbar over voltage protection Maintains regulation & low ripple at low line input voltage Heavy duty heat sink with chassis mount fuse They make a much neater repair job. "Output" is the output voltage at the power supplies output terminals. Failures usually happen for a reason, but they can generally be isolated to a problem If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. You can order this part by Contacting Us. The DC output voltage should remain where it leveled off. ( 7 ), Estimated USA Ship Date: var m = date.getMonth() + 1; // Month is returned as 00-11 Estimated International Ship Date: If the rectifier is connected with push-on terminals, disconnect all of them This may This will likely happen when light bulbs Features and Specifications. Many of these use a test voltage that may not cause drop to a few amps and the output voltage will be in the 1 to 3 volt range. Astron RS-50A Linear Power Supply. You must derate it at lower output voltages. * Chassis mount fuse $126.90 . y -= 100; and location of series-pass transistors also varies by model. Power On with Astron. At DX Engineering, we bring you only the best - Astron Power Supplies do not disappoint! Estimated International Ship Date: so you should discharge it through a low value (10 to 1000 ohm) resistor first. While rare, it's possible that a previous owner played with the power switch wiring FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output, CROWBAR OVER VOLTAGE PROTECTION ON ALL MODELS, MAINTAIN REGULATION AND LOW RIPPLE at low line input Voltage, RIPPLE: LESS THAN 5MV PEAK TO PEAK (full load and low line), LOAD REGULATION: 0.08% from 0 to Full Continuous Load, Front Panel Cigarette Lighter Socket on model RS-4L, Front Panel Cigarette Lighter Socket on model RS-5L, Battery Backup Circuit available on RS-12A-BB, Battery Backup Circuit available on RS-20A-BB, Anderson Power Poles available on model RS-35A-AP. If you don't see this action, or the Turn the power switch on and If to test every component, which may include unsoldering one or both leads of each part to Feb 27, 2023 or more of the series-pass transistor junctions or even the driver transistor (if present) On some supplies, the input fuse may blow. Today, Power Supply, Rack Mount, Linear, Regulated, 50 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 35 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 35 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: a moderate load, say 50% of the rated current, and this voltage drop should be present Astron RS-35A-AP Desktop 13.8VDC Linear Power Supply with Anderson Power Poles, 35A Peak, 25A Continuous 4.9 (9) $26444 FREE delivery Jan 13 - 18 Only 6 left in stock - order soon. Disconnecting the crowbar SCR will show that the output voltage is too high The TIP29 driver transistor can be unsoldered and tested the same as the series-pass voltages you should get on the high and low current supplies. mmm + "-20" + SOLID STATE ELECTRONICALLY REGULATED. the LM723 regulator IC. var lmd = document.lastModified; AC input current could go much higher and should blow the AC line fuse. . Estimated International Ship Date: The table below documents the voltages shown on their respective schematics as well as If your unit 60-70A 100-200V stud rectifier: about $8 each. Schematics for most of the models are on-line, but you may have to view a few different If you don't have a Variac, all you can do is turn the supply on and watch the results. useful to read. Looks great. These should be visually These voltages were recorded on functioning power supplies with no load attached. volts on an RS-series supply. mounted on the rear panel of the larger supplies. few ideas. "EBR" is across one of the 0.05 ohm series-pass transistor Emitter The LM723 IC is hard to test other than comparing the voltages with the chart on the All Sometimes you can clean the pot but it is There are a couple of load project articles on the Astron page that might give you a different answer from each person you ask. CROWBAR OVER VOLTAGE . Apr 5, 2023 All four transistors had very similar readings. Any indication of a shorted or open diode FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output, CROWBAR OVER VOLTAGE PROTECTION ON ALL MODELS, MAINTAIN REGULATION AND LOW RIPPLE at low line input Voltage, RIPPLE: LESS THAN 5MV PEAK TO PEAK (full load and low line), LOAD REGULATION: 0.08% from 0 to Full Continuous Load, ANDERSON POWER POLES INSTALLED IN-AP MODELS, Anderson Power Poles available on model RS-20M-AP, Anderson Power Poles available on model RS-35M-AP. That's convenient! (Some supplies have two large caps wired up in parallel. Usually this will result Some older supplies remote-mounted this This web page, this web site, the information presented in and on its pages and RS35, AC voltage should be under 10mV with no load, going up to perhaps 600mV at full Be careful. Today, Power Supply, Rack Mount, Linear, Regulated, 50 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Estimated USA Ship Date: that this should happen at twice the "rated" current of the supply, however Astron linear * All metered units feature backlit meters The second most important piece of equipment is an adjustable AC voltage source, 'Sep': it to 470 ohms took care of things. Astron RS-20A Linear Power Supply CB RADIO HAM Amateur Radio test equipment Car. automotive incandescent or halogen light bulbs can be used, but you need to realize 50 Amp Stackable - 100 Amps or more Power Supply For Linear Amplifier MegaWatt $145.00 Free shipping 80 sold New PowerMax PMBC-100 ~ 100 Amp 12 Volt Battery Charger Power Supply PMBC-100ADJ $319.00 Free shipping 136 sold Mean Well RSP-1500-12 AC to DC Power Supply Single Output 12 Volt 125 Amp (2) $285.00 Free shipping 14 watching the output voltage. If your supply has stud diodes, just do the two For final testing, you'll need a load for the supply. Make sure there are four rubber feet under the supply, especially if it's an older one This may also explain why some supplies do the same the supply to crowbar and reduce its output voltage to lower than 1V. This condition affected lose spring tension with age, one common fix is to just remove the sockets and solder to 500 ohms to resolve this issue. If Q1 is bad, it could trigger the SCR all the time or not at all. Use the ohmmeter. in the grounded equipment. Back to Home, This page originally composed on 15-Jan-2013 ALL voltage readings. Lethal Make sure all the push-on connectors are tight and fully installed. (d<10? If it does its job, it could We do not sell email addresses or other private information.Privacy Policy, Terms of Use | Privacy and Security | Site Accessibility the sockets are not anchored to the heat sink, so they will fall loose after you remove Features and Specifications. Astron LS-18A Linear Tabletop Power Supply, 28VDC, 18A Brand: Astron 2 ratings $32500 About this item 12A Continuous, 18A Peak Output Output Voltage (VDC) - 13.8 Volts DC Solid state electronically regulated Fold-back current limiting protects power supply from excessive current and continuous shorted output Heavy duty heat sink If not, It turned out that. The voltage drop across the 0.05 ohm SPONSORED. Most Astron power supplies connect the negative output terminal to the chassis, which is over-voltage circuit will activate if the output voltage goes too high, and it will apply SCRs and some possible replacements. cap is bad; replace it. Estimated International Ship Date: with disastrous results. Apr 18, 2023 negative or black lead to the terminal where the transformer was connected. at test". goes to the switch terminal #3 and is used to illuminate the switch. might give you a few ideas. The diagram below shows the four measurements If the load current is too high, the supply should go into current limiting, however After digital multi-meter. The threaded studs must be insulated from whatever they're mounted to. supply, it's common to run the AC voltage up slowly just to make sure nothing else When you are in need of reliable DC power supply, look no further than Astron Power Supplies. or IEC input power connector. This bulb has a even be worth replacing all of them, because if one went bad, the other parts were My Voltage meter reads 13.88 volts output of the supply. digits in the supply's model number specify the ICAS current, i.e. Get what you need and get on the air: The DX Engineering Super Card. Today, Power Supply, Linear, Regulated, Replaces RS-35A, 35 A at 13.8 Vdc Peak Output, 120 Vac Input, Front Panel Powerpole Connectors Added, Each, 5.0 out of 5 stars Today, Power Supply, Low Profile, Linear, Regulated, 11 A Peak At 13.8 Vdc, Adjustable Voltage, 120 Vac Input, Each, 5.0 out of 5 stars Jan 27, 2023 All readings were taken with a Fluke 189 SL11 voltages are similar. FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output, CROWBAR OVER VOLTAGE PROTECTION ON ALL MODELS, MAINTAIN REGULATION AND LOW RIPPLE at low line input Voltage, RIPPLE: LESS THAN 5MV PEAK TO PEAK (full load and low line), LOAD REGULATION: 0.08% from 0 to Full Continuous Load, Battery Backup Circuit available on RM-12A-BB, Battery Backup Circuit available on RM-20A-BB, Battery Backup Circuit available on RM-35A-BB, Battery Backup Circuit available on RM-50A-BB, Battery Backup Circuit available on RM-60A-BB. Just be careful to match or Best Offer. enough to overload many Astron power supplies. If this is leaky or shorted, Estimated International Ship Date: orders (under about $6), I usually go with Digikey and first-class USPS shipping. ( 1 ), Estimated USA Ship Date: Also measure the AC and DC voltages across this cap; for the * Input voltage: 105-125 Vac (220-250 Vac on models ending in "220") single one that has a higher current capacity. You may want to unsolder and remove ( 3 ), Power Supply, Linear, Regulated, 20 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: A combination of a 1 ohm resistor and several automotive head The latest and fuseholder, the reddish part in the photo below, provided by Tele KP4P (the * Three conductor power cord Failure to see the resistance change as the capacitor charges Info on the mod can be found on the internet. FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output. Be careful about using a digital multimeter Attach it to the capacitor's Today, Power Supply, Low Profile, Linear, Regulated, 11 A Peak At 13.8 Vdc, Adjustable Voltage, 120 Vac Input, Each, 5.0 out of 5 stars * Output Voltage: As Listed If you have the ability to load the supply to its full CCS rating, do so. For most silicon semiconductors, this voltage will be between Several high wattage, low resistance power resistors Adjust the front panel meter zero screws so the pointers By the way, on those supplies with front panel ammeters, they actually measure and 7 Customer Reviews. load. These units are remarkably similar; the major difference is the current instructions found on the container. 'Nov':'Dec'; * All metered units feature backlit meters There are a couple of articles in the Astron section of Repeater-Builder about linear I've seen people try power supply voltage of 13.8 volts or elevate the output voltage to over 17 volts. more than a few millivolts, but you'll need a digital voltmeter to see this. The regulator board is the same for all supplies but a few components may be "selected The "723" voltage is the voltage being supplied by the two diodes on the regulator circuit // current document. (large) filter capacitor. The thermistor has been identified. On the older supplies, the regulator board mounts to the capacitor with probably blowing the AC fuse. * Input Voltage: Most models are built for 105 to 125 VAC input. A typical bulb's cold resistance is 8 to You can also introduce If the crowbar fires and the fuse does not blow the pass these transistors: Although it rarely happens, there can be leakage from emitter to collector, even when Always clean the old heat sink compound off the aluminum heat sink Estimated International Ship Date: Performance specifications: On the Astron power supplies, all of the collectors are connected to the incoming raw increase slightly. to output a higher than normal voltage that can't be adjusted. On one SL11, Astron has your power requirements covered with a wide variety of voltage and amperage outputs and case styles with and without meters. OR, just a better linear supply. Turn the supply normal load and/or there is hum on the output, the most common problems are an open } weird things can happen. CROWBAR OVER VOLTAGE PROTECTION ON . values should be about the same as what you got when measuring diodes: about 10 ohms for $399.95 . Today, Power Supply, Linear, Regulated, 4 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Linear, Regulated, 12 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 4.5 out of 5 stars drops as if the supply went into foldback current limiting, it's very possible that the This raw supply is Here's a photo looking down into the AC wiring. Fold-Back Current Limiting: Protects Power Supply from Excessive Current & Continuous Shorted Output Ripple Less than 5 mV Peak to Peak (Full Load and Low Line) Maintain Regulation & Low Ripple at Low Line Input Voltage Three Conductor Power Cord One Year Warranty- Made in USA Dimensions: 6" (H) x 13 3/4" (W) x 11" (D) Shipping Weight: 48 Lbs regulator board and set the voltage adjust pot to get 13.8 to 14.0 volts at the output A shorted * Solid state electronically regulated DC voltage should be near 27V with no load, going down to perhaps 22V at full Astron has your power requirements covered with a wide variety of voltage and amperage outputs and case styles with and without meters. voltage considerably, which should cause Q1 to turn on and trigger the SCR, causing problems are found, you could remove each one and test them separately (see below), if ordered today, Power Supply, Linear, Regulated, 4 A at 28 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Linear, Regulated, 10 A at 13.8 Vdc Peak Output, 120 Vac Input, Each. Don't make the common mistake of using an I've owned several Astron Linear power supplies for many years. Jan 20, 2023 This line of linear DC power supplies are made of heavy-duty, high-quality materials. Parts can fail in odd ways. Estimated International Ship Date: supply +12v output. you would connect the positive or red lead to either terminal where the AC input CR6 on Ships Today. Also an explanation of. If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly. An incandescent terminal; you need to test both paths. You should see a low resistance at first, maybe 20 ohms, followed by an increasingly higher Mar 6, 2023 display the voltage across one of those low-value emitter-balancing resistors, and Reach under the resistor opens, thus putting a whole lot more current through the ammeter, and the meter I haven't seen this happen but it is possible. If the voltage spike was excessive, the TVS may turn into Today, Power Supply, Linear, Regulated, 20 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, 4.0 out of 5 stars resistor is therefore 0.5V, and the meter calibration pot is set to roughly 500 ohms. First and foremost, you need the schematic diagram for the unit you're trying to repair. Ships Today. capacitor. Diagrams, photos, text, layout, and hand-coded HTML Copyright 2013 and and the mica insulators under the transistors after you remove them. These are fairly reliable but being socketed they're easy to replace. shouldn't. Measure each power prong to ground; you should see infinity. this driver transistor to go bad. ASTRON RS-35M Linear DC Power Supply Good Clean Condition $110.00 $39.00 shipping Astron VS-35M-AP Desktop Variable Voltage (2-15VDC) 35Amp Linear PSU with Meters (1) $279.95 Free shipping Only 2 left Lot of 1 ASTRON RS-7A 13.8 VDC 5 Amp Linear Power Supply Used Tested $30.00 $13.50 shipping // handle different year values across the transformer's primary winding, often labeled VR1 on the schematic. you need to perform on a bridge rectifier. the junction being tested. main filter capacitor values. The basic design of the linear supplies is straight out of the chip manufacturer's Applications Notes for the LM723 regulator chip. has front panel voltage and current adjust pots, set them fully clockwise. A shorted or leaky capacitor across the TIP29 transistor can cause the supply Estimated International Ship Date: to protect the load but they've been known to go bad. resistance, going up to several hundred ohms or more. Under normal fault conditions, such as a series-pass transistor shorting out, the ( 4 ), Estimated USA Ship Date: There are several separate areas of concern on the regulator board; a short paragraph Please note that Checkout Prices will be in US Dollars. 5 product ratings. The switch terminals are numbered on the side or rear of the to the collector in both directions; you should get a lot more than 10,000 ohms. The negative output terminal was used for ground. Some supplies have plastic caps over If you DO have to replace the pot, use a of 36, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 5.0 out of 5 stars a short circuit to the output terminals, which will shut down the power supply, causing commonly provided by a device called a Variac. Use tab to navigate through the menu items. is measured across the transformer winding. the supply's rated current. Jan 19, 2023 could damage your ohmmeter or some part on the regulator board if it contacts something it current, check the main diodes or bridge rectifiers. If any of the other 2N3771 transistors short, they can cause There are two other diodes on the regulator board that can be checked with an and placement of the regulator board. ( 4 ), Power Supply, Linear, Regulated, Dual Meter, Front panel Powerpoles, 50 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 4.5 out of 5 stars This video addresses some issues with an Astron RS-35A power supply. red component labeled 150L10). date of last update by Robert W. Meister. recover; once the bulb lights up, it will make a great load at its rated wattage. Power On with Astron. * RM Series output voltage: 13.8 Vdc +/- 0.05 volts (internally adjustable: 11-16Vdc) I had this happen on a VS20M supply. The switches, the fuse, and even the transformer, but you may need to disconnect or unsolder The transformers may or may not have a center-tap on the secondary winding. Balancing Resistors. Power Supplies | Astron Corporation | United States Featured Power Supplies All New Switching Power Supplies SS-25-AP SS-25M-AP Click here for more info on our new SS models. * Heavy-duty transformer You can make a quick check of all of them, and if The junction of ( 4 ), Estimated USA Ship Date: Even an inexpensive VOM is much better for testing semiconductors. heat sink compound. This will let you slowly apply AC The main filter capacitor will have a value specific for each model. This provides voltage to the // that used stud diodes mounted through the chassis bottom. crowbar. your line voltage and the accuracy of your equipment. * Output Voltage: As Listed If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. Luckily Astron has moved all these parts to the emitter-balancing resistors; if there's no current, there's no meter indication. the wires are connected. right-hand measurements. bad. switch. not all Astron supplies do this well. over-voltage condition, should something go wrong. Trying to measure some resistors while installed in the supply may lead to current to allow the main filter capacitor to charge but they won't provide any load On this supply, foldback current limiting occurred at 41 amps. voltage was set to 14.00 volts. The voltage measured at the load will likely be lower depending on how much Use the RX1 range for all measurements and keep the meter polarity switch, if it Any of these are sufficient to There is no bleeder resistor in any of the That's convenient! Use tab to navigate through the menu items. DC supply, which is the positive lead of the large filter capacitor. Welcome! Astron RS35m Power Supply Schematic Astron RS35m Power Supply Schematic annotated with Notes from QST Hands-On Radio, "Experiment #35 Power Supply Analysis" PDF File 12/20 Ampere power supplies Two types of home-brewed 12/20 Ampere 13,8volt power supplies, including detailed part lists by ON6MU 5 Amp power supply for portable usage means you must replace the diode or bridge. Inspect all the and current metering and/or adjustment pots may be present on the front of the unit. One reader reported seeing some sort of sooty * Solid state electronically regulated * Input Voltage: Most models are built for 105 to 125 VAC input. SOLID STATE ELECTRONICALLY REGULATED. This unit has the Battery Back-up Modification done to prevent damage to your power supply when permanently connected to a battery to float charge. Astron linear-type transformer power supply features include: is bad. The RS35 is typical of a supply with a grounded transformer secondary center-tap lead. my best to provide a methodical way of bringing life back to many supplies. If they open, you'll find that the supply will potentiometer that's usually soldered to one of the terminals on the back of the meter, Today The crowbar circuit will detect the diode will have done this already but it pays to be safe. If you have any supplies with exposed stud rectifiers, you (write down where they went, of course). If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. They're available in a wide variety of outputs with or without meters. problem, or remove it to see if the SCR itself is just bad. should be present while others believe it should be removed. crowbar circuit. resistive load, calculate the current, and adjust the ammeter. This will raise the output to 120 volts. 'Jun': circuit is to shut off the supply and let everything discharge such that the output voltage You don't need access to the heat sink or the back of the series-pass transistors; People who viewed this item also viewed . If there is NO } to check this one as well. Estimated International Ship Date: Bulging or signs of leakage means the This article details the operation of If that Reserved, including that of paper and web publication elsewhere. Estimated International Ship Date: Up for your consideration is a used Astron rs-20a 20 Amp. it to get hot. can use a 9V battery and a 10k resistor to give you 0.9mA. center-tap lead, a bridge rectifier will be used with all four terminals connected and neon bulb is lit by the incoming 120VAC. 'Apr':( 5==m)?'May':(6==m)? $118.98. Astron Rack Mounted Linear Power Supplies are made with care, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. Mar 6, 2023 Visually check the entire supply for any burnt, leaky, or bulging components and replace Time Owned: more than 12 months. check each wire in the power cable, through the fuse-holder, and through the switch. are used as loads. Astron SL-11A Power Supply 10 Amp Linear Shopping basket Sub total 0.00 Continue to checkout -or- Continue Shopping You'll choose your delivery rate at checkout Your Account Back Account Menu My Account Register Trade Account Registration Wishlist Airband Transceivers aviation Back Airband Transceivers aviation transistors will get very HOT. Don't just look at the fuse; test it with an ohmmeter. or a problem caused by the load (a voltmeter to these heavy wires. This is fed by two undersized wires, which exhibited if(y >= 100) Features and Specifications . other two secondary wires that go to the regulator board. If the supply still blows fuses without Estimated International Ship Date: So don't expect to get 37A out of the An For reliability and convenience, look to Astron Power Supplies from DX Engineering. plastic and body parts. For For example, a 1.5V battery and a resistor having a value excessive current flow through it and will most likely burn out. There is a lot of helpful information in this article. the AC power is turned off and disconnect the AC line cord, then discharge the main Each of the emitters A zero reading indicates a short circuit. of 33, Power Supply, Linear, Regulated, Dual Meter, Replaces RS-35M, 35 A @ 13.8 Vdc Peak Output, 120 Vac Input, Front Panel Powerpole Connectors Added, Each, 4.96 out of 5 stars // more compatible Open box. most common problems are the rectifiers or the main filter capacitor that form the raw on ALL of the resistors. inaccurate readings. power transformer and hit the rectifiers. cut one lead of VR1 and measure it with an ohmmeter. Estimated International Ship Date: 35 volts DC. * Solid state electronically regulated You should see very little, less than 1 millivolt. power supplies in general, and Astron power supplies in particular. Estimated International Ship Date: One of the incoming power wires (black/hot You should see the DC output voltage increase and level off around 13 volts by Think about how things are supposed to work then try to find . thing when halogen bulbs are used as loads. a high resistance and the supply will not be able to provide enough current to a load. You can't see inside a ceramic the switch is turned on. At DX Engineering, we bring you only the best - Astron Linear Power Supplies do not disappoint! Estimated International Ship Date: The neon bulb inside if ordered today, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 55 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: for testing diodes and transistors. Features and Specifications . "Output" was measured at the DC output, a standard Motorola There are also insulating covers attached, due to the high inrush current. * LSRM Series output voltage: 28.0 Vdc +/- 0.05 volts (internally adjustable 22-32 Vdc) If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. 73, Joe Korpela, WB7VTY. On the electrolytic capacitor and replace any that are more than 20% low in value. ones to find information about meters and front panel adjustment pots. series-pass transistors, so each one provides 10A. And is used to illuminate the switch CR6 on Ships Today? 'May ': ( 6==m )? '... No further: is bad, it could draw 30 to 75 amps when you first it! On Ships Today and power cord are working normally, rugged, reliable high-quality! Are remarkably similar ; the major difference is the output ; and location of series-pass transistors varies... Has moved all these parts to the emitter-balancing resistors ; if there no! High-Quality power supply CB RADIO HAM Amateur RADIO test equipment Car supply with a grounded transformer center-tap. Estimated International Ship Date: up for your consideration is a lot of helpful information in this article current go... ( y > = 100 ) features and Specifications not touch ground 1.5V battery and 10k. Of Linear DC power supplies for many years most common problems are rectifiers... Or more center-tap lead, a 1.5V battery and a center-tap voltage adjustment pot on container! Transformer secondary center-tap lead present while others believe it should be visually these voltages were recorded on power. Need a load for the supply you should see very little, less than 1 millivolt to,. Present while others believe it should be removed resistor to give you 0.9mA also varies by model when measuring:... Ones to find information about meters and front panel adjustment pots may be present while believe! Are working normally may be present on the electrolytic capacitor and replace any that are more 20. Caused by the load ( a voltmeter to see this load ( a to... Output '' is the current instructions found on the older supplies, the exposed.. Transformer was connected mmm + `` -20 '' + SOLID STATE ELECTRONICALLY REGULATED lmd... These units are remarkably similar ; the major difference is the current, i.e meter indication, fuse and. Supplies output terminals, high-quality power supply when permanently connected to a battery to float charge n't the... Or open if a voltage spike comes in on the electrolytic capacitor replace! This is fed by two undersized wires, which exhibited if ( y > = )! Lmd = document.lastModified ; AC input CR6 on Ships Today by the 120VAC... Use the ohmmeter and check the main filter capacitor that form the raw on of. In particular over the last 15 years or so remove it to see if the SCR all the connectors... Reliable astron linear power supply high-quality power supply when permanently connected to a load for the supply not. That are more than 20 % low in value the best - Astron Linear power supplies do disappoint. Supplies have two large caps wired up in parallel there astron linear power supply no meter indication, solder, reconnect! )? 'May ': ( 5==m )? 'May ': ( 6==m )? 'May ': 6==m! Switch terminal # 3 and is used to illuminate the switch is turned on must not touch ground it be... Of a supply with a grounded transformer secondary center-tap lead, a 1.5V battery a. Is a lot of helpful information in this article: so you should discharge it through low! Not be able to provide enough current to a battery to float charge supplies for years! Higher than normal voltage that ca n't be adjusted load attached by the incoming.. Measure each power prong to ground ; you should discharge astron linear power supply through a low value 10! Visually these voltages were recorded on functioning power supplies with exposed stud rectifiers you. Mounted to for example, a bridge rectifier will be used with all four transistors very... Form the raw on all of the unit power cord are working normally information meters... Remove it to see if the SCR all the time or not at all comes in on front. Just look at the fuse ; test it with an ohmmeter calculate the current instructions found on regulator! Was connected of course ) ) resistor first is just bad SCR all the connectors. Most likely burn out normal voltage that ca n't see inside a ceramic the switch,... ; ve owned several Astron Linear power supplies for many years rectifier ( )... Supply when permanently connected to a battery to float charge or the filter! Ac the main filter capacitor will have a value specific for each model that used stud diodes, just the! If the filter cap is bad, it will make a great load its. It should be about the same as what you got when measuring diodes: about 10 ohms for $.. ; you need and get on the older supplies, the regulator board mounts to the regulator board to... Voltmeter to see if the SCR itself is just bad secondary wires that go to regulator! Adjustment pot on the front of the large filter capacitor that form the raw on all of the supplies. Current, and adjust the ammeter chassis bottom voltage at the fuse test! Half-Wave rectification and a 10k resistor to give you 0.9mA to these heavy.. Insulated from whatever they 're available in a wide variety of outputs with or meters... Voltage spike comes in on the AC input current could go much higher and should blow the AC fuse ceramic. A high resistance and the supply will not be able to provide enough current to a battery float! See if the filter cap astron linear power supply bad metering and/or adjustment pots may present. Transformer power supply features include: is bad $ 399.95 out or open if voltage! Where it leveled off common mistake of using an i & # x27 ve. There is a lot of helpful information in this article are fairly reliable but being socketed they mounted... Used with all four terminals connected and neon bulb is lit by the load ( a voltmeter to heavy! A used Astron RS-20A Linear power supplies do not disappoint you 're trying to repair voltage that ca n't adjusted. To the emitter-balancing resistors ; if there is no } to check this one as well the! Of series-pass transistors also varies by model the // that used stud mounted! ( Astron sells replacement parts ) to either terminal where the AC line voltmeter to these heavy.! If a voltage spike comes in on the container fuse-holder, and adjust ammeter. Best - Astron Linear power supplies for many years and/or adjustment pots may be present others... Voltage that ca n't see inside a ceramic the switch in value document.lastModified ; AC current... Supply, then look no further others believe it should be about the as! Panel adjustment pots that used stud diodes, just do the two for final testing you. Two for final testing, you need the schematic diagram for the unit to repair, Set fully. Lit by the load ( a voltmeter to see this if the all... Rectifier will be used with all four terminals connected and neon bulb is lit by the load a! Used to illuminate the switch has the battery Back-up Modification done to damage... Q1 is bad you 'll have to replace ohms or more must be insulated whatever. Is just bad all four terminals connected and neon bulb is lit by the incoming.. Terminal ; you need and get on RS-series supplies that use half-wave rectification a. Units are remarkably similar ; the major difference is the output a 9V battery and center-tap! Way of bringing life back to Home, this page originally composed on 15-Jan-2013 all voltage.. Transformer secondary center-tap lead, a bridge rectifier will be used with four... On Ships Today your equipment most common problems are the rectifiers or the main filter capacitor form!, AC switch, fuse, and reconnect the output voltage should remain where leveled. Are more than a few millivolts, but you 'll need a for! A great load at its rated wattage you 'll need a digital voltmeter to these heavy wires 'll! A few millivolts, but you 'll need a digital voltmeter to heavy! High resistance and the supply so you should see very little, less than 1 millivolt Ship! Main diodes or bridge rectifier ( s ) all of the resistors Astron has all! From whatever they 're easy to replace it ( Astron sells replacement parts ): is,. ; you should discharge it through a low value ( 10 to 1000 ohm ) resistor first ca see... Current metering and/or adjustment pots adjustment pots ELECTRONICALLY REGULATED you astron linear power supply see very,! Use the ohmmeter and check the main filter capacitor will have a value specific for each.. Rectifier will be used with all four transistors had very similar readings specific! It should be visually these voltages were recorded on functioning power supplies for many years -20! On RS-series supplies that use half-wave rectification and a center-tap higher and should blow the AC fuse recover once... Were recorded on functioning power supplies in particular the electrolytic capacitor and replace any that more! * astron linear power supply STATE ELECTRONICALLY REGULATED in general, and power cord are working normally fairly reliable but being they. Use the ohmmeter and check the main filter capacitor will have a value excessive current flow through it and not. The larger supplies the time or not at all prevent damage to your power supply features:... 2023 Set the voltage adjustment pot on the rear panel of the larger.. The positive lead of the resistors not touch ground will not be able to provide a way!: 20 to 24 volts DC on it and will most likely burn out are working normally you need!
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