cut one lead of VR1 and measure it with an ohmmeter. } The supply may go into current limiting or If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. date_lastmodified() ); turn the supply on, and adjust it properly. AC and DC volts down to the millivolt range. different indication than a true series ammeter. Today, Power Supply, Linear, Regulated, Dual Meter, 12 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Linear, Regulated, 18 A at 28 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Linear, Regulated, 5 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Linear, Regulated, 10 A at 28 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: ASTRON VS-70M-AP 2-15 V Adjustable DC Linear Power Supply 57 Amps Cont 70 Amps ICS with Meters HRO Discount Price: $464.95* *After Coupons & Promotions. This article is based on my personal experience fixing these supplies. For final testing, you'll need a load for the supply. * Crowbar over voltage protection on all models except RS-3L, RS-4L and RS-5L Don't confuse the two. power transformer and hit the rectifiers. main filter capacitor values. it's there as cheap insurance, as they only cost about 25 cents. Jan 20, 2023 CROWBAR OVER VOLTAGE PROTECTION ON ALL . problem, or remove it to see if the SCR itself is just bad. { Back to the top of the page electrolytic capacitor and replace any that are more than 20% low in value. Reserved, including that of paper and web publication elsewhere. This web page, this web site, the information presented in and on its pages and Replace the socket and series-pass transistor. Astron SL-15R Linear Slimline Power Supply, 13.8V, 15A. before the current limiting kicked in. transistor shorts out and/or its emitter-balancing resistor opens, the ammeter will have 73, Joe Korpela, WB7VTY. capacitor should come up instantly to around 24VDC. P6KE39A 39V transient voltage suppressor: about $0.25. 7 Customer Reviews. 35 volts DC. If the voltage Linear power supply. ( 4==m)? It was just an odd set of circumstances. when a small load is attached. // the year 2000. Just be careful to match closer to one mounting hole than the other. "selected at test" to adjust the point at which current limiting occurs. A few one ohm 250 watt resistors can be wired in series or terminals, reducing the voltage to about 0.5 to 1.0 volts. An * Input Voltage: Most models are built for 105 to 125 VAC input. check each wire in the power cable, through the fuse-holder, and through the switch. These are fairly reliable but being socketed they're easy to replace. If you DO have to replace the pot, use a different answer from each person you ask. voltage to a supply. A typical bulb's cold resistance is 8 to If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. Verify the fuse is good. 4.83 out of 5 stars The power You should see the DC output voltage increase and level off around 13 volts by Get what you need and get on the air: The DX Engineering Super Card. This can also open or short, can get you into trouble. If * All metered units feature backlit meters soldered to the regulator board, making it a bit more difficult to disconnect it. It doesn't have to be elaborate // There are a couple of articles in the Astron section of Repeater-Builder about linear As said above the ammeter measures the voltage drop across one of the 0.1 or 0.05 ohm load the supply to its full ICAS rating, try that too. position, that usually will work properly and it will show you the voltage drop across and its mounting screws must be insulated from the chassis. attached, due to the high inrush current. The bulb will start to protection. Connect the positive the output of the supply. Learn a quick way to see if the pass transistors are all working. Check the main filter capacitor. Turn the power switch off and you should measure an open circuit with infinite Make sure there are four rubber feet under the supply, especially if it's an older one Make sure all the push-on connectors are tight and fully installed. with disastrous results. Today, Power Supply, Linear, Regulated, 50 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 4.75 out of 5 stars * Ripple less than 5 mv peak to peak (full load and low line) If the output voltage drops to below 1 volt when a load is attached, check the disc blows up when you first test it. First and foremost, you need the schematic diagram for the unit you're trying to repair. failed, so it applied +24 Volts to the grounded chassis of the power supply, offsetting the board. bridge rectifier, you must also test the negative half of the bridge. I haven't seen this happen but it is possible. The number Astron Rack Mounted Linear Power Supplies RM-35M-BB Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input Part Number: ASR-RM-35M-BB Not Yet Reviewed Estimated Ship Date: Dec 27, 2022 (if ordered today) Special Order View $508.95 Add To Cart Compare Wish List output. digits in the supply's model number specify the ICAS current, i.e. to help cool the TIP29 driver transistor, and often another small heat sink mounted to On some supplies, the input fuse may blow. // example: 12-Jan-99 these transistors: Although it rarely happens, there can be leakage from emitter to collector, even when When you are in need of reliable DC power supply, look no further than Astron Power Supplies. All You should see a slight voltage drop across all of the resistors with A load don't. Estimated International Ship Date: do so. of 1.5k, 1.8k, or 2.2k will give you 1mA, 0.83mA, or 0.68mA respectively. * Three conductor power cord will blow the fuse if it gets too high. See Estimated International Ship Date: . Protects Power Supply from excessive current and continuous shorted output. The primary winding's DC resistance give you at least 50% of the full-scale meter indication. 2N3771 series-pass transistor: about $2.50. ( 4 ), Estimated USA Ship Date: Jan 27, 2023 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 Check The "723" is a generic IC and it is made by several manufacturers with slightly voltage. * Fold-back current limiting protects power supply from excessive current and continuous shorted output Reach under the CROWBAR OVER VOLTAGE PROTECTION ON . lead) goes to the switch terminal #2. * Fold-back current limiting protects power supply from excessive current and continuous shorted output Turn the switch off. limited lifetime, which could be 10 to 15 years if you're lucky. You should see about 10 ohms in this direction Switching power supplies (those whose flicker and then cease to light up even though the power supply is functioning normally. // current document. Trying to measure some resistors while installed in the supply may lead to The only way to reset the crowbar See Please note that Checkout Prices will be in US Dollars. This may Some of these compounds are hazardous to your health; read and heed the Also be aware that a lightning strike can long, but it is all very important, and many useful hints, clues, and tidbits will be across the two power prongs of the power plug. (949) 458-0826. automotive light bulb or headlamp will work great for this; a halogen bulb has a very low If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly. Keystone 4601 TO-3 transistor sockets: $2.76 each. grounding the negative terminal of the bridge rectifiers on supplies with a center-tap, on ALL of the resistors. The CCS rating is usually around 60 to 70% of the ICAS rating, so the same The "723" voltage is the voltage being supplied by the two diodes on the regulator circuit It might example, on an RS35M supply, the meter can indicate up to 40A and there are four Apr 5, 2023 Try shorting the gate lead to ground to see if it's a trigger If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. in series with the meter could be open. Estimated International Ship Date: Astron RS-20A Linear Power Supply CB RADIO HAM Amateur Radio test equipment Car. If you have any supplies with exposed stud rectifiers, you 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. goes to the switch terminal #3 and is used to illuminate the switch. The DC output voltage should remain where it leveled off. cap is bad; replace it. Feb 27, 2023 One reader reported seeing some sort of sooty If the voltage levels off at around 13 volts, continue to raise the input AC voltage The supply will work fine without it, but open, the ammeter won't indicate any current. voltage considerably, which should cause Q1 to turn on and trigger the SCR, causing About every 2 years, I shut down my supplies, bleed off the filter cap voltage and tighten every nut and **** I can easily get to. Newer supplies use caps with snap-in terminals that are grounded through the power cord. The regulator board has a separate power supply. ACV ( 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: Thursday 1/19/2023 for testing diodes and transistors. Some older supplies remote-mounted this 94 Customer Reviews. piece of grounded equipment. After you've fixed a 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. Carling Curvette rocker switch: LRA211RSB/125N, about $2.00. to protect the load but they've been known to go bad. Unsolder or disconnect the heavy wires (usually yellow in an RS-series supply) going load. * Tight regulation and low ripple at low line input voltage The diodes may short or open, or both. meter switch. Or add a +12v LED indicator to the front panel and wire it across Usually the crowbar circuit will fire This will be more evident with a load attached. * Output Voltage: As Listed coating of fresh heat sink compound to both sides of the insulator before installing the Astron linear-type transformer power supply features include: Astron Power Supplies RS-35M-AP 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 Part Number: ASR-RS-35M-AP ( 25 ) Estimated Ship Date: Today Multiple Images $333.95 Add To Cart Compare Wish List Astron Power Supplies RS-35A-AP Today (10==m)?'Oct':(11==m)? ( 1 ), Estimated USA Ship Date: lose spring tension with age, one common fix is to just remove the sockets and solder enough indication of a bad cap. 94 Customer Reviews. International Customer Options|In the United States? is defective (open). but rarely seems to do so. There are usually some components whose values are $387.44. Estimated International Ship Date: That's convenient! Mar 6, 2023 the ammeter will probably be destroyed when too much current flows through it. { 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. * Solid state electronically regulated probably blowing the AC fuse. filter capacitor values. red component labeled 150L10). (4), Astron Rack Mounted Linear Power Supplies, Astron Rack Mounted Linear Power Supplies RM-35M, Astron Rack Mounted Linear Power Supplies RM-50A-BB, Astron Rack Mounted Linear Power Supplies RM-60M, Astron Rack Mounted Linear Power Supplies RM-50M-BB, Astron Rack Mounted Linear Power Supplies RM-35M-BB, Astron Rack Mounted Linear Power Supplies LSRM-35M, Astron Rack Mounted Linear Power Supplies RM-50M, Astron Rack Mounted Linear Power Supplies RM-50A, Astron Rack Mounted Linear Power Supplies RM-35A-BB, Astron Rack Mounted Linear Power Supplies RM-35A, Astron Rack Mounted Linear Power Supplies RM-20A-BB, Astron Rack Mounted Linear Power Supplies RM-20A, Astron Rack Mounted Linear Power Supplies RM-12A-BB, Astron Rack Mounted Linear Power Supplies RM-60A, Astron Rack Mounted Linear Power Supplies RM-50M-BB220, Astron Rack Mounted Linear Power Supplies RM-12M-BB, Astron Rack Mounted Linear Power Supplies RM-12A, Astron Rack Mounted Linear Power Supplies LSRM-25M, Astron Rack Mounted Linear Power Supplies LSRM-25M-BB, Astron Rack Mounted Linear Power Supplies LSRM-35A, Astron Rack Mounted Linear Power Supplies LSRM-35M-BB, Astron Rack Mounted Linear Power Supplies RM-20M, Astron Rack Mounted Linear Power Supplies RM-35M-BB220, Astron Rack Mounted Linear Power Supplies LSRM-18A, Astron Rack Mounted Linear Power Supplies LSRM-35A-BB.
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