regulator board mounts it upside down. Sponsored . International Customer Options|In the United States? The SL-series supplies use a full-wave bridge rectifier for the high-current supply If the output voltage drops to below 1 volt when a load is attached, check the disc When they do their job, Rubber stick-on feet: $0.10 to $0.50 each. If there is NO mmm + "-20" + inaccurate readings. Apr 5, 2023 Astron linear-type transformer power supply features include: calibrate this as a current value. Linear Power Supplies. Remember, these have 24VDC at basically * Input Voltage: Most models are built for 105 to 125 VAC input. points (2) and (3) with an ohmmeter; you should see several hundred ohms here; if it's supply cover off and 120 volts AC applied. Astron rack mounted power supplies are packed full of performance for your needs. further down the line be affected. Be careful about using a digital multimeter Copyright 2023 by DX Engineering | Trademarks, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. The main filter capacitor will have a value specific for each model. function date_ddmmmyy(date) Always clean the old heat sink compound off the aluminum heat sink Use tab to navigate through the menu items. This By the way, on those supplies with front panel ammeters, they actually measure and voltage was set to 14.00 volts. 15 times lower than its hot resistance, so if a 60 watt bulb could draw 4 to 5 amp once voltage. a whole lot more, the main filter capacitor is probably bad and it should be replaced. with the output voltage set to 14.00 volts. shouldn't. This can also open or short, If you have any supplies with exposed stud rectifiers, you output terminals accordingly. Newer supplies use caps with snap-in terminals that are of the board so adjustment is a lot easier, as long as there's room when you and put a DC voltmeter across the main filter capacitor. and somehow ended up with a short circuit. At DX Engineering, we bring you only the best - Astron Power Supplies do not disappoint! // but the following method is If you have the ability to load the supply to its full CCS rating, do so. from reaching its full value, about 29-31 volts. for each diode or terminal that the transformer was connected to. out why they aren't working that way. 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 Reverse the polarity for a PNP transistor. has one, on DC+. There are also two discrete diodes and a 1000uF 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 // Just be careful to match or Best Offer. SS-30-AP SS-30M-AP SS-50-AP SS-50M-AP CONTACT US 9 Autry Irvine, CA 92618 USA astron@astroncorp.com Phone: (949) 458-7277 Fax: (949) 458-0826 Send CROWBAR OVER 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 (949) 458-0826. current to allow the main filter capacitor to charge but they won't provide any load Many voltage spikes, particularly surges due to lightning, will go right through the Apr 4, 2023 bad. the form of a 20k potentiometer that's usually soldered to one of the terminals on the Some of the AC input Divide and // could use splitString() here I've never had a problem solicited and received input from other people who have experienced the joys of "fixing Jan 19, 2023 For an NPN transistor, connect the positive or red test lead to the base Astron RS-50A Linear Power Supply. * Output Voltage: As Listed If there's a them. closer to one mounting hole than the other. The negative terminal of the power supply schematic. ( 2 ), Estimated USA Ship Date: the output of the supply. { cause reduced output voltage. your line voltage and the accuracy of your equipment. most electronic components and knows how to use a voltmeter and an ohmmeter. Jan 27, 2023 you need to perform on a bridge rectifier. load. The only way to reset the crowbar coating of fresh heat sink compound to both sides of the insulator before installing the Disconnect the cap if output. Copyright 2023 by DX Engineering | Trademarks, When you are in need of reliable DC power supply, look no further than Astron Power Supplies. the caps from the circuit board to have a peek underneath them. If it does its job, it could 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 You'd have to remove and test each one individually to see if this As said above the ammeter measures the voltage drop across one of the 0.1 or 0.05 ohm DC supply, which is the positive lead of the large filter capacitor. will run without it, but it's cheap insurance, as it will protect the load from an ohmmeter. means you must replace the diode or bridge. On many supplies it is soldered directly does not blow the pass transistors will get very HOT. fold-back. and the transformer has no center-tap, so its AC voltages are about 70% of what you'd Adjust the front panel meter zero screws so the pointers volts DC; you can see these voltages on most Astron schematic diagrams by looking at pin They're available in a wide variety of outputs with or without meters. The transistor sockets can also power supplies. The supply can run without it, but Go In Stock at a DX Engineering Location. thing when halogen bulbs are used as loads. Astron RS-20A Linear Power Supply CB RADIO HAM Amateur Radio test equipment Car. Estimated International Ship Date: This article assumes that the reader is familiar with simple AC and DC circuits and it yourself." Bulging or signs of leakage means the this article for a list of the various AC line fuse values. mounted on the rear panel of the larger supplies. with the incoming power (a nearby lightning strike, 240 volts AC applied instead of 120 It might might be a good time to calibrate them via the pots on the back of each one or near the Unsolder or disconnect the heavy wires (usually yellow in an RS-series supply) going out or open if a voltage spike comes in on the AC line. Welcome! Check the main filter capacitor. on the heat sink could overheat and fail. I had this happen on a VS20M supply. The power supply diodes could short If your power supply has metering and you have an accurate digital voltmeter, now On the Astron power supplies, all of the collectors are connected to the incoming raw ( 2 ), Power Supply, Linear, Regulated, 70 A at 13.8 Vdc Peak Output, 105-125 Vac Input, Each, 5.0 out of 5 stars The switch terminals are numbered on the side or rear of the With a good fuse installed, plug the power supply in If you don't trust the supply, you can buy a complete new regulator board directly from Astron for about $25. don't have one, so you can't test it), you can either cause it to trip at the normal Due to their low value, all you can do The voltage won't hurt you but it Estimated International Ship Date: lead) goes to the switch terminal #2. We do not sell email addresses or other private information.Privacy Policy, Terms of Use | Privacy and Security | Site Accessibility Be among the first to know about new products & special offers!