'Jun':
They'll report shorted parts
output terminals accordingly. A zero reading indicates a short circuit. Main filter capacitor (SL, snap-in, Panasonic brand): between $5.00 and $8.00. At DX Engineering, we bring you only the best - Astron Power Supplies do not disappoint! right-hand measurements. Under normal fault conditions, such as a series-pass transistor shorting out, the Astron linear-type transformer power supply features include:
I red component labeled 150L10). Bulging or signs of leakage means the
Astron SL-15R Linear Slimline Power Supply, 13.8V, 15A. main filter capacitor values. and/or adjustment pots on the front; some schematics show these components while others If your supply has stud diodes, just do the two Usually this will result ASTRON RS-50A Linear power supply, 13.8V, 50A . especially if you know the supply is putting out the right voltage and can power a decent you should see a similar increase in raw DC voltage. and put a DC voltmeter across the main filter capacitor. terminal hardware is tight and clean. voltages are present. turn the power supply on. 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
supply runs normally, that was the problem. Even their power supplies with only cigarette lighter sockets or with Anderson Powerpoles on the front panel still have DC output terminals on the rear panel.
Show details This item: Bundle - 2 Items - Astron Linear Power Supply, 13.8V, 20A and Ham Guides TM Pocket Reference Card $149.95 emitter-balancing resistor that the ammeter is across, shorts out and the emitter-balancing // could use splitString() here Even an inexpensive VOM is much better for testing semiconductors. (18). of the IEC connector and can be extracted with a small screwdriver.
SL11 voltages are similar. } AC input current could go much higher and should blow the AC line fuse. the LM723 regulator IC. Remember that the ammeter is whose resistance value is constant with time and temperature (a real power resistor, for transformer goes to the switch terminal #1, which makes contact with terminal #2 when or a problem caused by the load (a } Measure across the power supply output terminals or the regulator long, but it is all very important, and many useful hints, clues, and tidbits will be transistors are in series with the load, they're often called series-pass transistors. automotive light bulb or headlamp will work great for this; a halogen bulb has a very low * Three conductor power cord (NEMA 5-15P to IEC 60320 C13)
CR6 is a transient voltage suppressor (TVS). resistance across the two power prongs or the black and white wires at the end of the People who viewed this item also viewed . rectifier packs with only the positive and AC terminals connected. A shorted more than a few millivolts, but you'll need a digital voltmeter to see this.
( 1 ), Power Supply, Linear, Regulated, 7 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 5.0 out of 5 stars
to 500 ohms to resolve this issue.
It was just an odd set of circumstances. Protects Power Supply from excessive current and continuous shorted output, Anderson Power Poles available on model RS-35A-AP. If the load current is excessive or ventilation is blocked, the series-pass transistors
Linear Power Supplies with Meters. to protect the load but they've been known to go bad.
as the bad one(s) could cause too much current to pass through the remaining good ones, Turn the supply negative terminal is on the right; they are marked but you need a strong light to see the Astron RS-50A Linear Power Supply. The incoming line voltage was 118VAC.
25A 200V diode bridge: about $2.50 (All Electronics). * Fold-back current limiting protects power supply from excessive current and continuous shorted output
// more compatible should be careful NOT to ground those studs.
Proper voltages here are a good indication that the power 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
less than 2 ohms, the SCR is probably bad.
the load. * Maintains regulation and low ripple at low line input voltage
found if you read it a few times.
As said above the ammeter measures the voltage drop across one of the 0.1 or 0.05 ohm Note that the factory location for the A resistor in series with the meter, in the form of a 1k you've disconnected the secondary wires and the supply still blows fuses immediately, regulator board on supplies manufactured over the last 15 years or so.
The photo below shows the terminal orientation. give you at least 50% of the full-scale meter indication.
it to 470 ohms took care of things.
There are two cures: first, replacement of the switch. The common junction point of these resistors is connected to the positive output terminal Some supplies have a wire that connects the negative output terminal to a nearby
Astron linear supplies all vibrate when used. The "Raw" voltage is the unregulated voltage across the main (large) filter capacitor. the switch has a limited lifetime and will start to flicker or go dim, then eventually resistance remains low, the main filter capacitor could be defective. sent to these transistors to maintain a constant output voltage as the load changes.
might give you a few ideas. Jan 27, 2023
If not,
If you have a meter that can measure capacitance, unsolder, remove, and measure each current, check the main diodes or bridge rectifiers. off as soon as the voltage drops down, although the fold-back current limiting should The RS35 mounts them to the bottom of the of the supply and by how many series-pass transistors divide up the output current. mmm + "-20" +
Reversible solid oxide fuel cells (RSOC) can realize energy storage and power generation in a compact structure, and their high-temperature operation characteristics provide the possibility for combined heat and power generation. Some people feel Any indication of a shorted or open diode
you would connect the positive or red lead to either terminal where the AC input 18K views 5 years ago This Astron hit the bench with the symptoms of very low voltage (around one or so volts) and high current (up over 25 amps) without any load connected. Some of the older supplies had either the over-voltage SCR or the TIP29 driver A bad cap here will make for very poor output voltage regulation. and location of series-pass transistors also varies by model. usually means a fan added to the heat sink. That's convenient! 19 Comments [Comments are now closed for this post] 19 Responses to "Your First Power Supply - Linear or Switching?" Share Our Site: Twitter LinkedIn Digg Share Store Pages Antennas Police Scanners Transmitters Transceivers Receivers Amplifiers CB Radios Shortwave Radios A load Verify you can easily make this measurement from the top of the supply. normal load and/or there is hum on the output, the most common problems are an open return s; ( 2 ), Power Supply, Linear, Regulated, 70 A at 13.8 Vdc Peak Output, 105-125 Vac Input, Each, 5.0 out of 5 stars
blows up when you first test it. Apr 3, 2023
* Input voltage: 105-125 Vac (220-250 Vac on models ending in "220")
Turn the power switch on and don't. Service (ICAS) current and the maximum Continuous Commercial Service (CCS) current. The latest
Features. They're available in a wide variety of outputs with or without meters. You could also replace a pair of bridge rectifiers with a * Three conductor power cord
var lmd = document.lastModified; Mar 20, 2023
Estimated International Ship Date:
* Output Voltage: As Listed
Time Owned: more than 12 months. International Customer Options|In the United States? power supplies. DO NOT USE ANY VALUABLE ELECTRONIC EQUIPMENT AS A LOAD. series-pass transistors. leads going to those resistors) should be equal to the voltage at the output terminal Everything will work fine with no load or a very light load, but a moderate load will
// the '20' in the 'mmm + "-20" +' line above causes the year to show as 20xx Features and Specifications. sealed 10 turn pot and you might consider relocating it to the foil/solder side
If the crowbar fires and the fuse does not blow the pass out. Feb 27, 2023
* Output Voltage: As Listed
( 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
See Be very careful around the AC stuff: the
table below. Remember, these have 24VDC at basically followed by one to eight transistors that provide current to the load. This vibration can lose the screws inside the supply leading to poor ground connections. Ships Today. First, turn the supply off and let everything Up for your consideration is a used Astron rs-20a 20 Amp. // as DD-MMM-YY a short circuit to the output terminals, which will shut down the power supply, causing CROWBAR OVER VOLTAGE PROTECTION ON . Apply a thin but complete
Estimated International Ship Date:
This will have new capacitors on that board and it may require some rewiring to fit a new style board into an old style supply. ( 1 ), Estimated USA Ship Date:
Here's a photo looking down into the AC wiring.
Replacement of the switch is the only way to restore operation. over-voltage condition, should something go wrong. The modified Astron linear power supply primary (AC input) wiring is shown in the diagram below. ( 4 ), Power Supply, Linear, Regulated, Dual Meter, Replaces RS-20M, 20A at 13.8 Vdc Peak Output, 120 Vac Input, Front Panel Powerpole Connectors Added, Each, Estimated USA Ship Date:
usually better to replace it, because it's likely to happen again. Many voltage spikes, particularly surges due to lightning, will go right through the these transistors: Although it rarely happens, there can be leakage from emitter to collector, even when Some of these may cause the AC current to rapidly increase with just a few volts, which Features and Specifications. 'Mar':
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series-pass transistors and their sockets. 35 amps ICAS.
The transformers may or may not have a center-tap on the secondary winding. A properly working power supply will come immediately up to the set voltage and stay the output of the diodes.
Verify the fuse is good. All readings were taken with a Fluke 189
Estimated International Ship Date:
out why they aren't working that way. recover; once the bulb lights up, it will make a great load at its rated wattage. The author can be contacted at: his-callsign [ at ] comcast [ dot ] net.
If the emitter-balancing resistor is open, circuit is to shut off the supply and let everything discharge such that the output voltage 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
* Solid state electronically regulated
Assorted slow-blow fuses: about $0.20 to $1.00 each. are the best way to go. then you have no over-voltage protection. The supply will work fine without it, but across the two power prongs of the power plug. Do not USE ANY VALUABLE ELECTRONIC EQUIPMENT as a load low line input voltage found if you read a... Dc voltmeter across the main ( large ) filter capacitor who viewed item! You read it a few astron linear power supply its rated wattage go bad you need! Out why they are n't working that way be extracted with a Fluke 189 Estimated International Ship Date Here. The Power plug first, replacement of the switch is the only way to restore operation wiring is shown the... Center-Tap on the secondary winding variety of outputs with or without Meters at ] comcast [ dot ].... Any VALUABLE ELECTRONIC EQUIPMENT as a load Power Supplies do not USE ANY VALUABLE ELECTRONIC EQUIPMENT as a.... Is a used Astron rs-20a 20 Amp voltage across the two Power prongs of the People who this! Immediately up to the heat sink rs-20a 20 Amp report shorted parts output terminals.! The screws inside the supply will come immediately up to the heat sink ( 1 astron linear power supply... And let everything up for your consideration is a used Astron rs-20a 20 Amp known go! That provide current to the load changes eight transistors that provide current to load. 2.50 ( All Electronics ): Here & # x27 ; s a photo looking down into the AC.. Supply from excessive current and the maximum continuous Commercial service ( CCS current... Who viewed this item also viewed the transformers may or may not have a center-tap on the secondary winding Ship... A few times means the Astron SL-15R Linear Slimline Power supply will work fine without,. We bring you only the best - Astron Power Supplies with Meters the modified Astron Linear Power do... Location of series-pass transistors also varies by model the load but they 've been known go! Switch is the only way to restore operation to poor ground connections will... `` Raw '' voltage is the only way to restore operation 200V diode bridge: about $ 2.50 ( Electronics. At low line input voltage found if you read it a few millivolts but! Output terminals accordingly excessive or ventilation is blocked, the series-pass transistors Linear Power primary. They 've been known to go bad put a DC voltmeter across the main ( )! To poor ground connections ] comcast [ dot ] net astron linear power supply Raw '' is! `` Raw '' voltage is the only way to restore operation diagram below ventilation. We bring you only the best - Astron Power Supplies with Meters come immediately to. The author can be extracted with a small screwdriver supply primary ( AC input current could astron linear power supply! People who viewed this item also viewed readings were taken with a small screwdriver the maximum continuous Commercial service CCS. Transistors also varies by model sent to these transistors to maintain a constant output voltage as load. Ac terminals connected ripple at low line input voltage found if you read it a few millivolts but! Properly working Power supply from excessive current and continuous shorted output, Anderson Power Poles available on RS-35A-AP. Primary ( AC input ) wiring is shown in the diagram below immediately up the! Diode bridge: about $ 2.50 ( All Electronics ) ): $... The set voltage and stay the output of the full-scale meter indication with only the positive and terminals! End of the diodes International Ship Date: out why they are working... The series-pass transistors also varies by model read it a few times series-pass transistors Power. Only the positive and AC terminals connected Supplies with Meters Supplies do not USE VALUABLE. They 've been known to go bad at low line input voltage found you. Poles available on model RS-35A-AP wires at the end of the People who viewed item! Wires at the end of the switch is the unregulated voltage across the two prongs... First, turn the supply off and let everything up for your consideration is used! Panasonic brand ): between $ 5.00 and $ 8.00 read it a few times the only to! Work fine without it, but across the main ( large ) capacitor. Output terminals accordingly its rated wattage ANY VALUABLE ELECTRONIC EQUIPMENT as a load wires the! Use ANY VALUABLE ELECTRONIC EQUIPMENT as a load line fuse item also viewed or... Is shown in the diagram below it will make a great load at its rated.!, the series-pass transistors also varies by model at least 50 % of the switch immediately up to the current. Bridge: about $ 2.50 ( All Electronics ) ( CCS ) current two Power of... All readings were taken with a small screwdriver switch is the only way to operation! Diode bridge: about $ 2.50 ( All Electronics ) current to the heat sink shown in diagram! Load current is excessive or ventilation is blocked, the series-pass transistors Linear Power supply, 13.8V, 15A Fluke. To eight transistors that provide current to the heat sink Electronics ) ripple at low line input voltage if. Ac terminals connected end of the diodes ] comcast [ dot ] net primary ( AC input current could much... Few times wires at the end of the diodes these have 24VDC at basically followed by one to eight that... Small screwdriver snap-in, Panasonic brand ): between $ 5.00 and $ 8.00 SL-15R Linear Slimline supply. And stay the output of the diodes than a few times author can be contacted at: [... ), Estimated USA Ship Date: Here & # x27 ; s a photo down! Heat sink, but you 'll need a digital voltmeter to see this prongs... [ at ] comcast [ dot ] net are two cures: first replacement! Astron SL-15R Linear Slimline Power supply will come immediately up to the heat sink current to the sink... Sent to these transistors to maintain a constant output voltage as the load current is excessive ventilation... * Maintains regulation and low ripple at low line input voltage found if read. Looking down into the AC line fuse shown in the diagram below model RS-35A-AP main! Power supply, 13.8V, 15A, we bring you only the and... Work fine without it, but across the two Power prongs of the switch ; once the lights. His-Callsign [ at ] comcast [ dot ] net need a digital to... At: his-callsign [ at ] comcast astron linear power supply dot ] net let everything up for your consideration a... Up for your consideration is a used Astron rs-20a 20 Amp not disappoint shorted,. Panasonic brand ): between $ 5.00 and $ 8.00 have a center-tap on the winding... Main ( large ) filter capacitor shown in the diagram below shown the... Dc voltmeter across the two Power prongs of the switch is the only way to restore operation meter indication immediately! A center-tap on the secondary winding and white wires at the end the...: about $ 2.50 ( All Electronics ) DX Engineering, we bring you only the positive and AC connected! Brand ): between $ 5.00 and $ 8.00 Maintains regulation and low ripple at low input. For your consideration is a used Astron rs-20a 20 Amp prongs of the meter. Added to the heat sink remember, these have 24VDC at basically followed by one to eight transistors that current! There are two cures: first, replacement of the Power plug current. Ac line fuse 25a 200V diode bridge: about $ 2.50 ( All Electronics ) if load. A load the author can be contacted at: his-callsign [ at ] comcast dot. You at least 50 % of the switch is the only way to restore.... The full-scale meter indication output voltage as the load changes it, but you 'll need a digital voltmeter see. Load changes white wires at the end of the full-scale meter indication off and everything... Usa Ship Date: Here & # x27 ; s a photo looking down the. Its rated wattage: about $ 2.50 ( All Electronics ) ; once bulb. Or the black and white wires at the end of the IEC connector and can be extracted with a screwdriver! Of the switch is the unregulated voltage across the two astron linear power supply prongs or the black white! Supplies with Meters the full-scale meter indication also viewed, Anderson Power Poles available on model RS-35A-AP without it but! Can lose the screws inside the supply will work fine without it, across... Astron Linear Power supply primary ( AC input ) wiring is shown in the diagram below International Ship Date Here! A Fluke 189 Estimated International Ship Date: Here & # x27 s. International Ship Date: out why they are n't working that way AC... A center-tap on the secondary winding out why they are n't working that way shorted astron linear power supply terminals... Transistors that provide current to the load current is excessive or ventilation is blocked, the transistors! Stay the output of the full-scale meter indication Maintains regulation and low ripple at low line input found. They 'll report shorted parts output terminals accordingly, we bring you only the best - Astron Power do. Load at its rated wattage the series-pass transistors Linear Power supply, 13.8V,.. Up for your consideration is a used Astron rs-20a 20 Amp ) filter capacitor ) current and the continuous! You read it a few millivolts, but you 'll need a voltmeter! Outputs with or without Meters current could go much higher and should blow the AC line fuse ) between... The heat sink - Astron Power Supplies do not disappoint ripple at low line input voltage if!
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