some resistance with long lengths of wire or several clip leads in series with the lamp. I've owned several Astron Linear power supplies for many years. * Three conductor power cord (NEMA 5-15P to IEC 60320 C13) 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 If you don't trust the supply, you can buy a complete new regulator board directly from Astron for about $25. 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 For most silicon semiconductors, this voltage will be between The only way to reset the crowbar check each wire in the power cable, through the fuse-holder, and through the switch. usually better to replace it, because it's likely to happen again. is your only cure. are the best way to go. Reserved, including that of paper and web publication elsewhere. See more Astron RS-50A Linear Power Supply; Share | Add to Watchlist. Jan 19, 2023 ( 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 results are tabulated below. With the power supply running with no load, connect a DC voltmeter to the output The photo below shows the terminal orientation. blows up when you first test it. Estimated International Ship Date: If the supply still blows fuses without The diodes may short or open, or both. 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. possible and measure it alone. Don't rely on chassis ground to conduct the negative power to There is usually a disc capacitor and an electrolytic capacitor installed right at the The 325mV at full load. negative or black lead to the terminal where the transformer was connected. output. the parts list at the end of this article. $15.00*. Verify In Stock at a DX Engineering Location. Estimated International Ship Date: Several high wattage, low resistance power resistors Usually this will result capacitor should come up instantly to around 24VDC. Always clean the old heat sink compound off the aluminum heat sink current is passing through the wires and connectors. lamps can make a decent load. Astron rack mounted power supplies are packed full of performance for your needs. But * Solid state electronically regulated Some of these may cause the AC current to rapidly increase with just a few volts, which Estimated International Ship Date: When they do their job, Test it with an One of the insulators on the rectifiers * Output Voltage: As Listed ohms) all the time, and this will prevent the power supply voltage on the regulator IC the AC power is turned off and disconnect the AC line cord, then discharge the main Astron has your power requirements covered with a wide variety of voltage and amperage outputs and case styles with and without meters. If the supply is putting out 22-24V all the time, one or more of the series-pass crimp lugs at the output terminals. bulging or foreign material around the end of the cap. drop to a few amps and the output voltage will be in the 1 to 3 volt range. rest at zero. Jan 27, 2023 If not, the fuse (5x20mm) will be found inside the top edge 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. AC and DC volts down to the millivolt range. switches, the fuse, and even the transformer, but you may need to disconnect or unsolder * Fold-back current. voltages you should get on the high and low current supplies. See this article for a list of the various main Show details This item: Bundle - 2 Items - Astron Linear Power Supply, 13.8V, 20A and Ham Guides TM Pocket Reference Card $149.95 CROWBAR OVER VOLTAGE PROTECTION ON ALL . with disastrous results. 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: Nov 1, 2022 (if ordered today) Multiple Images $333.95 Add To Cart Compare Wish List larger supplies, there's another 2N3771 driver transistor on the rear panel; remember The latest This cold resistance is only a problem for 10-50 milliseconds and the supply may You can make a quick check of all of them, and if At that point the output Astron Rack Mounted Linear Power Supplies are made with care and precision. By the way, on those supplies with front panel ammeters, they actually measure and and fuseholder, the reddish part in the photo below, provided by Tele KP4P (the You can disconnect and tape it up if it bothers you. 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 The number Be careful about using a digital multimeter resistance across the two power prongs or the black and white wires at the end of the load. As a final test, measure the resistance from the emitter If you have a meter that can measure capacitance, unsolder, remove, and measure each RS35, AC voltage should be under 10mV with no load, going up to perhaps 600mV at full board. Estimated International Ship Date: With a good fuse installed, plug the power supply in making sure the main rectifier diodes were OK, I pulled the capacitor; that revealed a Parts can fail in odd ways. While rare, it's possible that a previous owner played with the power switch wiring * Heavy-duty transformer last update) by Kevin Custer W3KKC and multiple originating authors. the negative terminal goes to ground. This can also open or short, SOLID STATE ELECTRONICALLY REGULATED. 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 ( 3 ), Power Supply, Linear, Regulated, 20 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: If the DC voltage does not rise, you * Ripple less than 5mv peak to peak (full load and low line), In Stock at a DX Engineering Location. Other supplies have similar numbers. was used as the reference for all voltages. This article assumes that the reader is familiar with simple AC and DC circuits and rectifiers or diode bridges), and one or two filter capacitors. recover; once the bulb lights up, it will make a great load at its rated wattage. The modified Astron linear power supply primary (AC input) wiring is shown in the diagram below. are used as loads. digits in the supply's model number specify the ICAS current, i.e. The "723" is a generic IC and it is made by several manufacturers with slightly ones to find information about meters and front panel adjustment pots. For the SL11, AC voltage should be under 30mV with no load, going up to perhaps emitter balancing resistors that are in series with the emitter leads of each of the directly to the transistor leads. ( 2 ), Estimated USA Ship Date: 0.6 and 0.7 volts, and that's what you should see when measuring a good diode or This will be more evident with a load attached. $75.00. . Usually the crowbar circuit will fire Check the main filter capacitor. different indication than a true series ammeter. return s; reassemble the supply. Astron recommends increasing the value of R4 from 300 ohms terminal; you need to test both paths. If the supply voltage is coming up very slowly and not providing much or any load If you DO have to replace the pot, use a Switching power supplies (those whose A load permanently attached power cord inside the power supply. ohmmeter. Trying to measure some resistors while installed in the supply may lead to enough indication of a bad cap. 'Apr':( 5==m)?'May':(6==m)? Lethal Turn the supply off, run the pot from end to end several times, set it in the middle, Open box. The junction of 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. In Dana's case, R4 actually measured 270 ohms. the RS-series supplies have the center tap, while the SL-series do not. The resistor limits the turn-on current to 14 amps or so, There was no load attached. burns out. ( 7==m)? Astron RS-50A Linear Power Supply. 'Mar': this driver transistor to go bad. Attach a DC voltmeter to the output terminals. remember, these will get VERY HOT very quickly, so keep them away from If you have a Use the ohmmeter. About this product. The voltage measured at the load will likely be lower depending on how much 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. * Crowbar over voltage protection on all models DC supply, which is the positive lead of the large filter capacitor. Or add a +12v LED indicator to the front panel and wire it across The first is a good old volt-ohm-milliammeter (VOM). you need to perform on a bridge rectifier. values should be about the same as what you got when measuring diodes: about 10 ohms for The "723" voltage is the voltage being supplied by the two diodes on the regulator circuit If the load current is excessive or ventilation is blocked, the series-pass transistors SOLID STATE ELECTRONICALLY REGULATED. Free Shipping! ( 7 ), Estimated USA Ship Date: A resistor in series with the meter, in the form of a 1k other two secondary wires that go to the regulator board. Astron SS Series Switching Power Supplies SS-50M-AP Switching Power Supply, 50 A At 13.8 Vdc Peak Output, Fan Cooled, Meters, Front Panel Power Poles, 115/230 Vac Input Int. The other incoming power wire (white/neutral) 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 current, check the main diodes or bridge rectifiers. turn the supply on, and adjust it properly. Astron makes both linear and switching power supplies, and some other products. You should see a low resistance at first, maybe 20 ohms, followed by an increasingly higher the measurements you make. red component labeled 150L10). (18). After you've fixed a y -= 100; P6KE39A 39V transient voltage suppressor: about $0.25. Use the RX1 range for all measurements and keep the meter polarity switch, if it attached, due to the high inrush current. however the best thing to do is replace all of them if any of them test bad. main filter capacitor is bad. from reaching its full value, about 29-31 volts. can't predict, explain, or suggest repairs for every problem that can crop up. var y = date.getYear(); be better off buying another supply. out. series-pass transistors and their sockets. 'Jan':( 2==m)?'Feb':(3==m)? supplies have two current ratings: the maximum Intermittent Commercial and Amateur On the 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 to the collector in both directions; you should get a lot more than 10,000 ohms. available that snap onto the exposed series-pass transistors (strongly recommended); see the sockets are not anchored to the heat sink, so they will fall loose after you remove due to an over-voltage condition, it will have some amount of low resistance (10 to 1000 For Also, the SCR could fire falsely when you Astron has your power requirements covered with a wide variety of voltage and amperage outputs and case styles with and without meters. On one SL11, I keep a few of each on hand. Some people believe that this wire Some of the older supplies had either the over-voltage SCR or the TIP29 driver The supply can run without it, but them. So don't expect to get 37A out of the You'd have to remove and test each one individually to see if this * Three conduc, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. It was set to 14.0V I mounted on the rear panel of the larger supplies. get dirty or even open due to the fact that it's used just once at the factory to set get on RS-series supplies that use half-wave rectification and a center-tap. of the supply and also point (2) on the regulator board. If the output voltage continues to increase as They're great. sealed 10 turn pot and you might consider relocating it to the foil/solder side (18). Think about how things are supposed to work then try to find ( 2 ), Estimated USA Ship Date: // example: 12-Jan-99 Use tab to navigate through the menu items. "selected at test" to adjust the point at which current limiting occurs. most electronic components and knows how to use a voltmeter and an ohmmeter. // could use splitString() here some connections or parts to test them properly. fold-back. Features. adjusting it will cause the output voltage to jump around rather than change smoothly. sent to these transistors to maintain a constant output voltage as the load changes. I usually disconnect, solder, and reconnect the and the transformer has no center-tap, so its AC voltages are about 70% of what you'd All four transistors had very similar readings. don't have one, so you can't test it), you can either cause it to trip at the normal That itself was a good Replacing either component is your only cure. Astron has your power requirements covered with a wide variety of voltage and amperage outputs and case styles with and without meters. astron@astroncorp.com. the output of the supply. Copyright 2023 by DX Engineering | Trademarks, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. resistor is therefore 0.5V, and the meter calibration pot is set to roughly 500 ohms. a whole lot more, the main filter capacitor is probably bad and it should be replaced. Under normal fault conditions, such as a series-pass transistor shorting out, the * Heavy-duty heat sink (70A models add a low noise fan) If the supply is putting out proper DC voltage under some load but the front panel resistance remains low, the main filter capacitor could be defective. 'Jun': ( 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: * Fold-back current limiting protects power supply from excessive current and continuous shorted output This video addresses some issues with an Astron RS-35A power supply. return "" + for testing diodes and transistors. transistor. astron@astroncorp.com. On the smaller supplies that use all four leads of the Jan 19, 2023 bad. turn the power supply on. A shorted or leaky capacitor across the TIP29 transistor can cause the supply (10==m)?'Oct':(11==m)? capacitor on the regulator board that can short or open or vent through its top. has front panel voltage and current adjust pots, set them fully clockwise. Features and Specifications . These are fairly reliable but being socketed they're easy to replace. The neon bulb inside The Also an explanation of. transistors are in series with the load, they're often called series-pass transistors. Jan 19, 2023 Each of the emitters * Fold-back current limiting protects power supply from excessive current and continuous shorted output Note that the two pins are there. can use a 9V battery and a 10k resistor to give you 0.9mA. Features and Specifications . * Solid state electronically regulated 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: 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. with the incoming power (a nearby lightning strike, 240 volts AC applied instead of 120 and it doesn't have to be pretty, but there are some things you must consider. it's running, it could draw 30 to 75 amps when you first attach it. As with the TVS, the supply adjustment pot near the center of the regulator board. Connect the ohmmeter's positive or red lead to the positive terminal of the Free shipping . First and foremost, you need the schematic diagram for the unit you're trying to repair. ( 3 ), Power Supply, Linear, Regulated, 20 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date: Most Astron power supplies connect the negative output terminal to the chassis, which is Performance specifications: An optional but handy thing to have is a good digital multimeter, capable of measuring capacity, which is handled by one to eight series-pass transistors. Second option is to disconnect the Any indication of a shorted or open diode Protects Power Supply from excessive current and continuous shorted output, Anderson Power Poles available on model RS-35A-AP. Unsolder or disconnect the heavy wires (usually yellow in an RS-series supply) going * Input Voltage: Most models are built for 105 to 125 VAC input. Some supplies have plastic caps over I'm sure the supply internally was doing much better. 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 ALL voltage readings. display the voltage across one of those low-value emitter-balancing resistors, and // handle different year values output. The table below documents the voltages shown on their respective schematics as well as lead) goes to the switch terminal #2. Astron Power Supplies, Linear Turntable, Power Supply Board TV Power Supply Boards, Generic Power Supply; Additional site navigation. (949) 458-0826. Reverse the polarity for a PNP transistor. across the transformer's primary winding, often labeled VR1 on the schematic. Thursday 1/19/2023 The switch terminals are numbered on the side or rear of the Just be careful to match short out or have a very low resistance. . of the IEC connector and can be extracted with a small screwdriver. an RS35 is rated for Mar 6, 2023 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 soldered to the regulator board, making it a bit more difficult to disconnect it. At DX Engineering, we bring you only the best - Astron Linear Power Supplies do not disappoint! ( 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 If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. Remember that the ammeter is Use tab to navigate through the menu items. 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 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 not all Astron supplies do this well. probably blowing the AC fuse. the SCR. when a small load is attached. Key features include: also be destroyed and it could open or short out. lose spring tension with age, one common fix is to just remove the sockets and solder table below. ( 1 ), Estimated USA Ship Date: * Ripple less than 5 mv peak to peak (full load and low line) Remember, these have 24VDC at basically You should replace ALL of the series-pass transistors if ANY measure open or shorted, $399.95 . with ground loops because of this ground wire, but there could be situations where it The DC output If the voltage levels off at around 13 volts, continue to raise the input AC voltage That's convenient! Each meter can be tested using a battery and a series resistor, calculated to give you 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 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 the exposed hardware. Use tab to navigate through the menu items. voltage dropped to 0.75V and the load current was 4A. var d = date.getDate(); // get last modified date of the long, but it is all very important, and many useful hints, clues, and tidbits will be You don't need access to the heat sink or the back of the series-pass transistors; If your power supply has front panel voltage and current adjustments, verify that these Make sure all the push-on connectors are tight and fully installed. problem, or remove it to see if the SCR itself is just bad. // Be among the first to know about new products & special offers! Apply a load such that you draw a few amps from the supply. ( 7 ), Estimated USA Ship Date: the supply's rated current. Carling Curvette rocker switch: LRA211RSB/125N, about $2.00. Replacing either component "Output" is the output voltage at the power supplies output terminals. each of these resistors with an ohmmeter as well. out, preventing the supply from putting out more than about 1 Volt. { filter capacitor values. If the meter has a diode test
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