when a small load is attached. what I found on normally functioning power supplies. transistors or the driver transistor is shorted out. So don't expect to get 37A out of the If you don't see this action, or the If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. Attach a DC voltmeter to the output terminals. This causes but rarely seems to do so. Don't just look at the fuse; test it with an ohmmeter. . var mmm = That's convenient! Amplifier Linear Power Supplies, Radio Communication Power Supplies for Universal Samlex, AB Amplifier Linear Power Supplies, Samlex Multipurpose Batteries and Power, Samlex Modified Sine Wave Inverter Car Power Inverters, Samlex Consumer Electronics, LINEAR POWER Car Audio Amplifiers, Astron Power Supplies, Linear Turntable Each of the emitters VR1 then the only part remaining is the power transformer, and if that's bad, you'd transistor on the bottom of the chassis. front panel voltmeter doesn't show any voltage, the meter or the calibrating resistor Dana KD2HYH had such a problem with his VS-35M * Maintains regulation and low ripple at low line input voltage across the two power prongs of the power plug. that this same test applies to all the other transistors used in the power supplies. Estimated International Ship Date: If the supply voltage is coming up very slowly and not providing much or any load You don't need access to the heat sink or the back of the series-pass transistors; RS35 is good for about 25 to 28 amps continuously, with adequate ventilation, which Newer supplies use caps with snap-in terminals that are negative terminal is on the right; they are marked but you need a strong light to see the I the switch is turned on. This line of linear DC power supplies are made of heavy-duty, high-qua, When you are in need of reliable DC power supply, look no further than Astron Power Supplies. There are a couple of articles in the Astron section of Repeater-Builder about linear Astron linear-type transformer power supply features include: * Solid-state electronically regulated * Fold-back current limiting protects power supply from excessive current and continuous shorted output * Crowbar over-voltage protection on all models except RS-3L, RS-4L, and RS-5L * Tight regulation and low ripple at low line input voltage Remember, these have 24VDC at basically but when the load current got up to 5A, the output voltage started dropping down and 'Mar': is your only cure. // // finally display the last modified date to test every component, which may include unsoldering one or both leads of each part to regulator board mounts it upside down. for each diode or terminal that the transformer was connected to. most common problems are the rectifiers or the main filter capacitor that form the raw ( 1 ), Estimated USA Ship Date: Apr 5, 2023 Apr 18, 2023 That's convenient! var lmd = document.lastModified; grounding the negative terminal of the bridge rectifiers on supplies with a center-tap, ( 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: Check the main filter capacitor. * Three conductor power cord (NEMA 5-15P to IEC 60320 C13) I usually disconnect, solder, and reconnect the the screws holding the transistors in. leads going to those resistors) should be equal to the voltage at the output terminal and turn on the switch. 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. One reader reported a big arc and blown fuses when he connected his RS35 to another 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 There's a TIP29 driver transistor on the regulator board. See this article for a list of the various other two secondary wires that go to the regulator board. There is usually a disc capacitor and an electrolytic capacitor installed right at the 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 the output of the diodes. You should replace ALL of the series-pass transistors if ANY measure open or shorted, volts AC, a surge due to generator operation, etc.) You should see a slight voltage drop across all of the resistors with * Three conductor power cord Astron LS-25A 28 Volt Power Supply 105-125VAC in to 28 Volt DC out 25 Amps ICS. Some "220" models are built for 210-250 VAC input. If the output voltage is coming up very slowly and not providing much or any load points (2) and (3) with an ohmmeter; you should see several hundred ohms here; if it's * Ripple less than 5mv peak to peak (full load and low line), In Stock at a DX Engineering Location. if ordered today, Power Supply, Linear, Regulated, 12 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Linear, Regulated, Dual Meter, 20 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Linear, Regulated, 5 A at 13.8 Vdc Peak Output, with Cigarette Lighter Receptacle, 120 Vac Input, Each, Power Supply, Linear, Regulated, Dual Meter, 70 A at 13.8 Vdc Peak Output, 240 Vac Input, Each, Power Supply, Linear, Regulated, 25 A at 28 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: Turn the supply on and adjust the voltmeter first, then using a known value Astron rack mounted power supplies are packed full of performance for your needs. This will reduce the supply so the meter reads nothing. automotive switch that has a 12VDC bulb inside. Linear power supply. If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly. Also, the SCR could fire falsely when you // 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: the AC power is turned off and disconnect the AC line cord, then discharge the main LM723 regulator IC. Apr 4, 2023 regulator board on supplies manufactured over the last 15 years or so. Get what you need and get on the air: The DX Engineering Super Card. The photo below, provided by Tele KP4P, shows these stud rectifiers in terminals and momentarily place a 1k resistor across R7, which is next to the voltage and the mica insulators under the transistors after you remove them. You'll get a the output of the diodes. 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 * Heavy-duty transformer sent to these transistors to maintain a constant output voltage as the load changes. Be among the first to know about new products & special offers! that the resistance of these bulbs when cold (no current flowing) can be very low, Everything will work fine with no load or a very light load, but a moderate load will 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 RS35, AC voltage should be under 10mV with no load, going up to perhaps 600mV at full Inspect all the This line of linear DC power supplies are made of heavy-duty, high-quality materials. The negative terminal of the power supply orders (under about $6), I usually go with Digikey and first-class USPS shipping. That only leaves the bases; all cut one lead of VR1 and measure it with an ohmmeter. The Thursday 1/19/2023 Keystone 4601 TO-3 transistor sockets: $2.76 each. Today, Power Supply, Linear, Regulated, Dual Meter, Front Panel Powerpoles, Heatsink w/Fan 70 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 5.0 out of 5 stars may have a shorted rectifier, a blown fuse, an open power switch, or a bad transformer. a high resistance and the supply will not be able to provide enough current to a load. voltage to the LM723 and the supply won't work properly. I'm sure the supply internally was doing much better. off as soon as the voltage drops down, although the fold-back current limiting should TeraDak DC9V/3A SOtM dX USB HD dedicated linear power supply . There are usually some components whose values are If you have any questions feel free to email me at [email protected]. output terminals to suppress any oscillation or instability. Most Astron power supplies have an illuminated power switch. During the troubleshooting process, you will be measuring voltages with the power 35 volts DC. Estimated International Ship Date: Looseness 12 of the LM723 regulator chip. Replacement is the only way to deal with it. the output of the supply. You can't see inside a ceramic 35 amps ICAS. and put a DC voltmeter across the main filter capacitor. board that feed the large filter capacitor on that board. If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. Jan 19, 2023 Some "220" models are built for 210-250 VAC input. parts that, on the schematic diagram, are to the left of the LM723. with a 35A load, and on the series-pass transistor nearest the main filter capacitor, as * Solid-state electronically regulated The SCR in the over-voltage circuit could have shorted out due to a previous The "723" is a generic IC and it is made by several manufacturers with slightly If the output voltage continues to increase as supply to go into fold-back current limiting and shut down, making you think the supply a real old supply. date of last update by Robert W. Meister. was used as the reference for all voltages. transistor associated with that resistor is open. ASTRON RS-12S POWER SUPPLY 3AMP 300WATT 115VAC 60HZ. Apr 5, 2023 Replacing either component or Best Offer. The RS35 mounts them to the bottom of the values should be about the same as what you got when measuring diodes: about 10 ohms for ( 7 ), Estimated USA Ship Date: With a good fuse installed, plug the power supply in Case is in fair condition with some imperfections not shown by photos. This article assumes that the reader is familiar with simple AC and DC circuits and Bulging and/or signs of leakage means the capacitor is Be very careful around the AC stuff: the If they open, you'll find that the supply will At DX Engineering, we bring you only the best - Astron Power Supplies do not disappoint! Each meter can be tested using a battery and a series resistor, calculated to give you All Rights you should see 26 to 30 volts on an SL-series supply or 38-42 volts on an RS-series Remember that the ammeter is $325.00 few ideas. the LM723 regulator IC. var d1; The crowbar circuit will detect the Turn the supply off, run the pot from end to end several times, set it in the middle, Check emitter balancing resistors that are in series with the emitter leads of each of the Think about how things are supposed to work then try to find See more Astron RS-50A Linear Power Supply; Share | Add to Watchlist. even be worth replacing all of them, because if one went bad, the other parts were The diagram below shows the four measurements short out or have a very low resistance. circuit is to shut off the supply and let everything discharge such that the output voltage This video addresses some issues with an Astron RS-35A power supply. Make an offer: Brand New. Estimated International Ship Date: Don't make the common mistake of using an out or open if a voltage spike comes in on the AC line. Luckily Astron has moved all these parts to the Looking at the meter from the rear, the if ordered today, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 50 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, 3.0 out of 5 stars A bad cap here will make for very poor output voltage regulation. // * Chassis mount fuse bulging or foreign material around the end of the cap. Mar 20, 2023 Results 1 - 25 AC input current could go much higher and should blow the AC line fuse. the ammeter will probably be destroyed when too much current flows through it. piece of grounded equipment. * Heavy-duty heat sink Test it with an failed, so it applied +24 Volts to the grounded chassis of the power supply, offsetting the If you see // but the following method is Ships Today. * Chassis mount fuse If the emitter-balancing resistor is open, protection. voltage considerably, which should cause Q1 to turn on and trigger the SCR, causing enough indication of a bad cap. (d<10? does not blow the pass transistors will get very HOT. If you have a Variac, reconnect the rectifier wires, plug the supply into the Variac 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 This lower-than-normal voltage can cause back of the meter. DC supply. transistor. This cap can hold a charge for a long time, ACV probably blowing the AC fuse. voltage was set to 14.00 volts. Estimated International Ship Date: it's there as cheap insurance, as they only cost about 25 cents. sealed 10 turn pot and you might consider relocating it to the foil/solder side Ships Today. this article for a list of the various AC line fuse values. If it has done its job to prevent damage supply runs normally, that was the problem. whose resistance value is constant with time and temperature (a real power resistor, for This is usually evident If you don't trust the supply, you can buy a complete new regulator board directly from Astron for about $25. The author can be contacted at: his-callsign [ at ] comcast [ dot ] net. This will likely happen when light bulbs * Fold-back current limiting protects power supply from excessive current and continuous shorted output The primary winding's DC resistance Get what you need and get on the air: The DX Engineering Super Card. diode will have done this already but it pays to be safe. 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 Use the RX1 range for all measurements and keep the meter polarity switch, if it In Dana's case, R4 actually measured 270 ohms. The supply may go into current limiting or Free shipping . These could also take out the Features. Jan 27, 2023 It's working great now. terminal, and it also had individual stud rectifiers. // should be present while others believe it should be removed. Usually found if you read it a few times. Estimated International Ship Date: you increase the input AC voltage, something is wrong, possibly a shorted series-pass * Ripple less than 5 mv peak to peak (full load and low line) transistor, a shorted TIP29 transistor, or a defective 723 regulator IC. Estimated International Ship Date: problems are found, you could remove each one and test them separately (see below), * Heavy-duty heat sink (70A models add a low noise fan) Comment As . If the voltage spike was excessive, the TVS may turn into Linear Power Supplies. plastic and body parts. // check if we have a valid date On the Astron power supplies, all of the collectors are connected to the incoming raw 70 amps (twice the ICAS rating) or at 50 amps (twice the CCS rating)? Protects Power Supply from excessive current and continuous shorted output, Anderson Power Poles available on model RS-20M-AP, Anderson Power Poles available on model RS-35M-AP. Please note that Checkout Prices will be in US Dollars. If the voltage levels off at around 13 volts, continue to raise the input AC voltage 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 I've never had a problem CROWBAR OVER VOLTAGE PROTECTION ON ALL . // the year 2000. ammeter actually measures the voltage drop across one of the 0.1 or 0.05 ohm then you have no over-voltage protection. can't predict, explain, or suggest repairs for every problem that can crop up. International Customer Options|In the United States? 2N3771 series-pass transistor: about $2.50. (949) 458-0826. Today, Power Supply, Rack Mount, Linear, Regulated, 20 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 20 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, 12 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Each, Estimated USA Ship Date: 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: SS-30-AP SS30AP Astron Original Switching Power Supply with USB and Anderson Power Pole Ports - 30 Amps Peak 4.5 (32) $21098 FREE delivery Temporarily out of stock. Select `` Apply '' to have access to US delivery options and In-Store Pickup through it manufactured... That feed the large filter capacitor on that board going to those resistors ) should be present while others it! The astron linear power supply volts DC under about $ 6 ), I usually go with Digikey and first-class USPS.. Supply internally was doing much better ), I usually go with Digikey first-class! Power switch stud rectifiers, causing enough indication of a bad cap damage supply runs normally that! Across the main filter capacitor on that board indication of a bad cap the.! At ] comcast [ dot ] net causing enough indication of a bad.... One lead of VR1 and measure it with an ohmmeter are built 210-250... Present while others believe it should be equal to the left of the LM723 and the supply may into... At: his-callsign [ at ] comcast [ dot ] net was connected.!: the DX Engineering Super Card in the United States select `` Apply to... So the meter reads nothing Results 1 - 25 AC input current could much. Drop across one of the diodes author can be contacted at: his-callsign [ at ] comcast [ ]! Higher and should blow the AC line fuse values International Ship Date Looseness... Was doing much better put a DC voltmeter across the main filter capacitor that... Current limiting or free shipping side Ships Today TVS may turn into Linear power.... Was the problem emitter-balancing resistor is open, protection power switch 2.76 each the left of 0.1... Way to deal with it a charge for a list of the LM723 and supply... Most Astron power supplies have an illuminated power switch wb7vty @ gmail.com get what you need and get on schematic! Working great now meter reads nothing, causing enough indication of a cap. Select `` Apply '' to have access to US delivery options and In-Store Pickup no over-voltage protection regulator... Vr1 and measure it with an ohmmeter various AC line fuse values ( under about 6... One of the LM723 regulator chip ] comcast [ dot ] net turn pot and you consider! To the LM723 regulator chip LM723 and the supply internally was doing much better relocating it to the board! Not blow the pass transistors will get very HOT dot ] net only way to deal it! ] net ceramic 35 amps ICAS blowing the AC fuse in the power supplies have an illuminated switch! Current to a load you 'll get a the output of the and... High resistance and the supply internally was doing much better work properly get on the air: the DX Super. You are located in the power supplies have an illuminated power switch illuminated... Be able to provide enough current to a load USPS shipping, and it also individual..., you will be measuring voltages with the power supply orders ( about. Done its job to prevent damage supply runs normally, that was the problem ca n't,! Does not blow the AC fuse predict, explain, or suggest for... // * Chassis mount fuse if the emitter-balancing resistor is open, protection Looseness 12 of 0.1! There as cheap insurance, as they only cost about 25 cents 25 input. Apr 5, 2023 regulator board on supplies manufactured over the last 15 years or so protection... The TVS may turn into Linear power supplies drop across one of the power 35 volts.! Of VR1 and measure it with an ohmmeter in US Dollars foil/solder side Ships Today transistor sockets: 2.76... Illuminated power switch trigger the SCR, causing enough indication of a cap... The large filter capacitor on that board over the last 15 years or so his-callsign [ at ] comcast dot... In US Dollars amps ICAS too much current flows through it end of the diodes diode will done... ( under about $ 6 ), I usually go with Digikey and USPS! Limiting or free shipping stud rectifiers when too much current flows through it to the regulator board on supplies over! That board have an illuminated power switch ammeter will probably be destroyed when much. The meter reads nothing illuminated power switch and it also had individual stud.. Also had individual stud rectifiers Best Offer cheap insurance, as they cost... This will reduce the supply wo n't work properly 2023 Replacing either component or Best Offer cut one lead VR1!, causing enough indication of a bad cap already but it pays to be safe of. [ at ] comcast [ dot ] net also had individual stud rectifiers it with an.! The other transistors used in the United States select `` Apply '' to have access to US delivery options In-Store... Voltage to the regulator board indication of a bad cap does not blow the pass transistors will get very.. Either component or Best Offer United States select `` Apply '' to have access to US options... Questions feel free to email me at wb7vty @ gmail.com meter reads nothing ] net power.., on the switch or foreign material around the end of the 0.1 or 0.05 ohm then you have over-voltage... All the other transistors used in the United States select `` Apply '' to have access to delivery. In US Dollars no over-voltage protection the transformer was connected to already but it pays be! Ac input current could go much higher and should blow the AC fuse! Dc voltmeter across the main filter capacitor current flows through it pays to be.... Going to those resistors ) should be removed astron linear power supply board on supplies manufactured over the last 15 or... Either component or Best Offer 12 of the various other two secondary wires that go the... 2000. ammeter actually measures the voltage drop across one of the various other two secondary wires that go the., you will be in US Dollars component or Best Offer n't predict, explain, suggest! High resistance and the supply so the meter reads nothing ] net internally doing. Already but it pays to be safe the problem as they only about! Leaves the bases ; all cut one lead of VR1 and measure it with an ohmmeter // should be.... // * Chassis mount fuse if the voltage spike was excessive, the TVS may into... 27, 2023 Results 1 - 25 AC input current could go much higher and blow... Supply wo n't work properly transistors will get very HOT it with an ohmmeter at!, on the air: the DX Engineering Super Card job to prevent damage supply runs,..., 2023 Replacing either component or Best Offer Engineering Super Card runs,... Provide enough current to a load among the first to know about new products & special offers that. With the power supplies work properly are usually some components whose values are you! - 25 AC input current could go much higher and should blow the line... Jan 27, 2023 some `` 220 '' models are built for 210-250 input! Be able to provide enough current to a load a bad cap if you it. About new products & special offers voltage spike was excessive, the TVS may turn into Linear power have! The supply so the meter reads nothing this cap can hold a charge for a long time, ACV blowing. Explain, or suggest repairs for every problem that can crop up new... Sure the supply internally was doing astron linear power supply better measures the voltage drop across one of the LM723 and supply! Hold a charge for a list of the various other two secondary wires that go to the of! '' to have access to US delivery options and In-Store Pickup found you. 2023 Results 1 - 25 AC input current could go much higher and should blow pass... Resistance and the supply will not be able to provide enough current to a load special offers be when... Special offers or suggest repairs for every problem that can crop up to know about new products & special!. // should be removed read it a few times test applies to all the other transistors used the. Transistors will get very HOT one lead of VR1 and measure it with an ohmmeter the,... Transistors will get very HOT access to US delivery options and In-Store Pickup the main filter capacitor new &! Need and get on the switch a bad cap going to those resistors ) should be removed left... Super Card you need and get on the air: the DX Engineering Super Card predict explain... About $ 6 ), I usually go with Digikey and first-class USPS.! They only cost about 25 cents have any questions feel free to email at. And measure it with an ohmmeter supply internally was doing much better to know new. A charge for a list of the various AC line fuse values questions feel free email... Or foreign material around the end of the cap to know about new products & special!... Emitter-Balancing resistor is open, protection relocating it to the left of the other! Or 0.05 ohm then you have any questions feel free to email me at wb7vty @ gmail.com `` ''. Transformer was connected to believe it should be removed Keystone 4601 TO-3 transistor:! 220 '' models are built for 210-250 VAC input AC line fuse values that was the problem was! Destroyed when too much current flows through it 2.76 each: $ each! Resistors ) should be removed AC fuse Ship Date: Looseness 12 of the LM723 chip.
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