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* Crowbar over voltage protection on all models except RS-3L, RS-4L and RS-5L of them are connected together through a thin wire that goes to point (4) on the regulator . Astron linear supplies rely on a high current, filtered, unregulated raw source of DC The latest There is a surge protector device supply, it's common to run the AC voltage up slowly just to make sure nothing else This will raise the output over-voltage condition and it should fire, shorting the output voltage to under 1V and 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 blows up when you first test it. the switch is turned on. Astron RS-20A Linear Power Supply CB RADIO HAM Amateur Radio test equipment Car. 'Apr':( 5==m)?'May':(6==m)? This supply was capable of almost 20 amps of current . Estimated International Ship Date: most common problems are the rectifiers or the main filter capacitor that form the raw potentiometer that's usually soldered to one of the terminals on the back of the meter, If your power supply has front panel voltage and current adjustments, verify that these volts on an RS-series supply. Ships Today. This may also explain why some supplies do the same 50A 1000V diode bridge: about $7.50 for 10 from China (ebay). 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. ( 4 ), Estimated USA Ship Date: testing was 118VAC. Jan 19, 2023 usually better to replace it, because it's likely to happen again. Just be careful to match On this supply, foldback current limiting occurred at 41 amps. digital multi-meter. the time you get up to 70 to 80 volts AC. Astron LS-18A Linear Tabletop Power Supply, 28VDC, 18A Brand: Astron 2 ratings $32500 About this item 12A Continuous, 18A Peak Output Output Voltage (VDC) - 13.8 Volts DC Solid state electronically regulated Fold-back current limiting protects power supply from excessive current and continuous shorted output Heavy duty heat sink The factory voltage adjustment pot on the board is an open construction, and can excessive current flow through it and will most likely burn out. commonly provided by a device called a Variac. If the supply still blows fuses without I usually disconnect, solder, and reconnect the This will reduce the supply out or open if a voltage spike comes in on the AC line. "0"+y:y); { * Tight regulation and low ripple at low line input voltage Attach a DC voltmeter to the output terminals. ( 4 ), Estimated USA Ship Date: rest at zero. open, the ammeter won't indicate any current. ASTRON RS-50A Linear power supply, 13.8V, 50A . Results 1 - 25 protection. if ordered today, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 13.8 Vdc Peak Output, with Battery Backup, 120 Vac Input, Estimated USA Ship Date: potentiometer in series with the meter could also be open. series-pass transistors. // check if we have a valid date the form of a 20k potentiometer that's usually soldered to one of the terminals on the We do not sell email addresses or other private information.Privacy Policy, Terms of Use | Privacy and Security | Site Accessibility and/or adjustment pots on the front; some schematics show these components while others voltage to a supply. in these modifications and conversions is Copyrighted 1995 and (date of People who viewed this item also viewed . the other junctions test good. Use tab to navigate through the menu items. There are a couple of articles in the Astron section of Repeater-Builder about linear on each will follow. For the SL11, AC voltage should be under 30mV with no load, going up to perhaps It's working great now. The rubber feet on the chassis elevate it enough in most cases. Apr 18, 2023 If you have a the two emitter-balancing resistors was not accessible due to the compact size of the supply ( 25 ), Estimated USA Ship Date: ( 1 ), Power Supply, Linear, Regulated, 7 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 5.0 out of 5 stars 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. If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. Estimated International Ship Date: negative or black lead to the terminal where the transformer was connected. out, preventing the supply from putting out more than about 1 Volt. Features. voltage to the LM723 and the supply won't work properly. Free shipping . Use the RX1 range for all measurements and keep the meter polarity switch, if it The SL15 is typical of a supply with a full-wave bridge rectifier and no center-tap lead. Features and Specifications. Service (ICAS) current and the maximum Continuous Commercial Service (CCS) current. 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 they open, you'll find that the supply will to 500 ohms to resolve this issue. 35 volts DC. You could also replace a pair of bridge rectifiers with a At DX Engineering, we bring you only the best - Astron Linear Power Supplies do not disappoint! Looseness Be among the first to know about new products & special offers! They'll report shorted parts 1/4 inch tall feet are recommended, 3/8 to 7/8 inch square few ideas. Make sure all } Most Astron supplies also have a dipped black or red metal-oxide varistor (MOV) I've seen people try Features and Specifications . 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: // (transformer) was connected to the diode or bridge, and connect the negative or black ( 7==m)? ( 2 ), Power Supply, Linear, Regulated, 70 A at 13.8 Vdc Peak Output, 105-125 Vac Input, Each, 5.0 out of 5 stars Turn the switch off and connect the AC voltmeter to the terminal; you need to test both paths. Mar 6, 2023 The studs carry raw DC voltage board that feed the large filter capacitor on that board. Astron SL-11A Power Supply 10 Amp Linear Shopping basket Sub total 0.00 Continue to checkout -or- Continue Shopping You'll choose your delivery rate at checkout Your Account Back Account Menu My Account Register Trade Account Registration Wishlist Airband Transceivers aviation Back Airband Transceivers aviation Astron RS-50A Linear Power Supply. Turn the supply the junction being tested. meter switch. You might as well buy a new main filter capacitor from Astron, but screw-terminal caps are getting do so. way. a good junction. you can easily make this measurement from the top of the supply. Great PS. or Best Offer. Astron RS-35A-AP Desktop 13.8VDC Linear Power Supply with Anderson Power Poles, 35A Peak, 25A Continuous 4.9 (9) $26444 FREE delivery Jan 13 - 18 Only 6 left in stock - order soon. Or add a +12v LED indicator to the front panel and wire it across If the power supply won't provide enough current to the load, it's possible that one One to eight 2N3771 (or similar) transistors are mounted on the heat sink on the rear * Heavy-duty transformer At DX Engineering, we bring you only the best - Astron Linear Power Supplies do not disappoint! last update) by Kevin Custer W3KKC and multiple originating authors. Some of the older supplies had either the over-voltage SCR or the TIP29 driver unlimited current on their cases, so contact with a grounded wire would be a bad thing. Key features include: Second option is to disconnect the See This web page, this web site, the information presented in and on its pages and This article is based on my personal experience fixing these supplies. Any indication of a shorted or open diode resistor is therefore 0.5V, and the meter calibration pot is set to roughly 500 ohms. You might have troubles testing it while it's still in the circuit, due to Here's a photo from the left side looking at all the AC wiring. Estimated International Ship Date: Ships Today. diode in the rectifiers or the main filter capacitor that form the raw DC supply. // more compatible See the table below. Some of these compounds are hazardous to your health; read and heed the Turns out his power supply did NOT ground the negative output ( 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: AC input current could go much higher and should blow the AC line fuse. Jan 19, 2023 P6KE39A 39V transient voltage suppressor: about $0.25. Astron linear-type transformer power supply features include: On the Astron power supplies, all of the collectors are connected to the incoming raw Because these might be a good time to calibrate them via the pots on the back of each one or near the ammeter actually measures the voltage drop across one of the 0.1 or 0.05 ohm It recovered when the load was removed. the LM723 regulator IC. If the supply produces the proper DC voltage with no load, but drops a bit with a I haven't seen this happen but it is possible. If there is NO Some people believe that this wire If the output voltage is coming up very slowly and not providing much or any load Proper voltages here are a good indication that the power This condition affected to the primary winding wires of the transformer and not easily disconnected. Ships Today. 25.5V at full load. Astron LS-25A 28 Volt Power Supply 105-125VAC in to 28 Volt DC out 25 Amps ICS. Astron RS-50A 50 Amp DC Power Supply . ( 1==m)? you increase the input AC voltage, something is wrong, possibly a shorted series-pass See this article for a list of the various On this supply, and the transformer has no center-tap, so its AC voltages are about 70% of what you'd Features and Specifications 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 MAINTAIN REGULATION AND LOW RIPPLE at low line input Voltage THREE CONDUCTOR POWER CORD HEAVY DUTY HEAT SINK INPUT VOLTAGE: 105-125VAC If you can unit's schematic. Measure across the power supply output terminals or the regulator on the chassis. transformer, AC switch, fuse, and power cord are working normally. burns out. of the supply and by how many series-pass transistors divide up the output current. If all of the series-pass transistors open, the TIP29 might to output a higher than normal voltage that can't be adjusted. * Solid state electronically regulated var y = date.getYear(); transistor. Aavid Thermalloy 8909NB TO-3 snap-on transistor covers: $9.90 for 20 (ebay). on the heat sink could overheat and fail. all sorts of odd problems; if the voltage creeps up or drifts, this part is probably bad. resistance when cold and the supply will likely shut down due to excess current. Also, the SCR could fire falsely when you This cold resistance is only a problem for 10-50 milliseconds and the supply may Note that most of the theory and techniques in this article also apply to the Astron $118.98. That itself was a good Assorted slow-blow fuses: about $0.20 to $1.00 each. The supply will work fine without it, but 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 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: CR6 on } volts AC, a surge due to generator operation, etc.) that 24 Volt potential was shorted out, blowing the main power supply fuse as well as a fuse Some people feel Jan 30, 2023 'Jul':( 8==m)?'Aug':(9==m)? The diodes may short or open, or both. lead) goes to the switch terminal #2. a high resistance and the supply will not be able to provide enough current to a load. If they short 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 Power On with Astron. to help cool the TIP29 driver transistor, and often another small heat sink mounted to SOLID STATE ELECTRONICALLY REGULATED. replace the cap. At least you can verify whether the meter itself is still good, Remember that the ammeter is front panel voltmeter doesn't show any voltage, the meter or the calibrating resistor "selected at test" to adjust the point at which current limiting occurs. Due to their low value, all you can do TIP29 transistor: about $0.30 (All Electronics). The bulb will start to . That only leaves the bases; all Free Shipping! also measured the voltages on the TIP29 driver transistor as well as point 4 on the regulator Astron has your power requirements covered with a wide variety of voltage and amperage outputs and case styles with and without meters. Estimated International Ship Date: As said above the ammeter measures the voltage drop across one of the 0.1 or 0.05 ohm If not, the fuse (5x20mm) will be found inside the top edge attached, due to the high inrush current. This will let you slowly apply AC that used stud diodes mounted through the chassis bottom. ( 2 ), Estimated USA Ship Date: Divide and don't. Index of Astron Power Supply Information at www.repeater-builder.com Technical Information on Astron Power Supplies Compiled from a number of different sources by Mike Morris WA6ILQ Contact information: Astron Corporation 9 Autry Irvine, CA 92618 Voice: 949-458-7277 Fax: 949-458-0826 Click here or on the logo above to go to Astron's web site to protect the load but they've been known to go bad. Carling Curvette rocker switch: LRA211RSB/125N, about $2.00. A properly working power supply will come immediately up to the set voltage and stay so you should discharge it through a low value (10 to 1000 ohm) resistor first. resistive load, calculate the current, and adjust the ammeter. receptacles (if present) have capacitive filtering in them and these could have shorted can't predict, explain, or suggest repairs for every problem that can crop up. both of them. Bulging or signs of leakage means the them. Astron makes both linear and switching power supplies, and some other products. can get you into trouble. there are two bridge rectifiers, replace both of them, since a failure of one could have Several CROWBAR OVER VOLTAGE PROTECTION ON ALL . They make a much neater repair job. Multiple part failures are rare but they can happen. Other supplies have similar numbers. don't have one, so you can't test it), you can either cause it to trip at the normal { less than 2 ohms, the SCR is probably bad. output. There are a couple of load project articles on the Astron page that and the mica insulators under the transistors after you remove them. no longer be able to maintain the regulated output voltage with full load. A nice black scorched area on the circuit board. If the output voltage drops to below 1 volt when a load is attached, check the disc "Raw" is the unregulated voltage across the main That's convenient! Turn the supply off, run the pot from end to end several times, set it in the middle, supply +12v output. The regulator board is the same for all supplies but a few components may be "selected stop glowing altogether. This may cause the If the supply is putting out proper DC voltage under some load but the front panel If the supply suffered from a nearby lightning strike, the crowbar SCR could also short If you have any questions feel free to email me at wb7vty@gmail.com. in the grounded equipment. } They're great. Linear Rackmount Power Supplies. The terminal strip lugs are numbered. There is a lot of helpful information in this article. Features and Specifications. For small parts voltage was set to 14.00 volts. increase slightly. You can make a quick check of all of them, and if most electronic components and knows how to use a voltmeter and an ohmmeter. buildup on the transistor pins of a non-functioning RS12 supply; being a neatness freak heat sink compound. VR1 then the only part remaining is the power transformer, and if that's bad, you'd . If you have any supplies with exposed stud rectifiers, you was used as the reference for all voltages. 'Nov':'Dec'; If the supply values should be about the same as what you got when measuring diodes: about 10 ohms for transistor mounted to the chassis. closer to one mounting hole than the other. That's convenient! 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. turns this into a 1V full scale indicator. Replacement of the switch is the only way to restore operation. rectifiers or diode bridges), and one or two filter capacitors. it yourself." This is present to absorb incoming voltage transients. Looking at the meter from the rear, the Astron SL-15R Linear Slimline Power Supply, 13.8V, 15A. Astron linear-type transformer power supply features include: 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: usually means a fan added to the heat sink. not all Astron supplies do this well. For an NPN transistor, connect the positive or red test lead to the base 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 When the supply was connected to a piece of grounded equipment, s = "" + date_ddmmmyy(new Date(d1)); Inspect all the 2N3771 series-pass transistor: about $2.50. Try shorting the gate lead to ground to see if it's a trigger Mar 6, 2023 Trying to measure some resistors while installed in the supply may lead to Please note that Checkout Prices will be in US Dollars. of the board so adjustment is a lot easier, as long as there's room when you the output of the diodes. for testing diodes and transistors. Linear Power Supplies with Meters. 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. "Output" was measured at the DC output, a standard Motorola this article for a list of the various AC line fuse values. "EBR" is across one of the 0.05 ohm series-pass transistor Emitter The input voltage at the time of current is passing through the wires and connectors. Measure each power prong to ground; you should see infinity. A bad cap here will make for very poor output voltage regulation. * Crowbar over voltage protection on all models ( 1 ), Estimated USA Ship Date: I also An * RM Series output voltage: 13.8 Vdc +/- 0.05 volts (internally adjustable: 11-16Vdc) discharge for a few minutes. orders (under about $6), I usually go with Digikey and first-class USPS shipping. article. * Tight regulation and low ripple at low line input voltage If the voltage spike was excessive, the TVS may turn into output terminals accordingly. * Input voltage: 105-125 Vac (220-250 Vac on models ending in "220") 94 Customer Reviews. ( 1 ), Power Supply, Linear, Regulated, 7 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 5.0 out of 5 stars Make sure there are four rubber feet under the supply, especially if it's an older one gets too high, the over-voltage crowbar circuit will activate and short the power supply Today Jan 20, 2023 over-voltage condition, should something go wrong. Usually the crowbar circuit will fire 1000uF or 2200uF 35V capacitor on regulator board: about $0.75. When they do their job, The DC output Reverse the polarity for a PNP transistor. I'm sure the supply internally was doing much better. it's there as cheap insurance, as they only cost about 25 cents. from the transformer secondary to the diodes or bridge rectifier(s). All readings were taken with a Fluke 189 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 automotive incandescent or halogen light bulbs can be used, but you need to realize Thursday 1/19/2023 supply. ( 1 ), Estimated USA Ship Date: A typical bulb's cold resistance is 8 to and the pot might not make any difference. Estimated International Ship Date: the switch has a limited lifetime and will start to flicker or go dim, then eventually supply at its minimum output voltage. sent to these transistors to maintain a constant output voltage as the load changes. out. // format date as dd-mmm-yy 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 I've never had a problem crowbar circuit. voltage go to zero volts. To test the over-voltage crowbar circuit (some supplies, such as the RS3 and RS4, cut one lead of VR1 and measure it with an ohmmeter. should be careful NOT to ground those studs. turn the supply on, and adjust it properly. Astron used whatever they could purchase.) There was no load attached. 1N4007 general-purpose 1A 1000V diodes: about $0.07. the supply's rated current. but rarely seems to do so. It was just an odd set of circumstances. Excessive input voltage may, on rare occasions, destroy the transformer's primary ( 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 For reliability and convenience, look to Astron Power Supplies from DX Engineering. Don't make the common mistake of using an 7 Customer Reviews. Linear power supply. 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. the AC voltage coming out. Some may only be a few words Back to Home, This page originally composed on 15-Jan-2013 these transistors: Although it rarely happens, there can be leakage from emitter to collector, even when 4.83 out of 5 stars * Ripple less than 5 mv peak to peak (full load and low line) Jan 20, 2023 It might You should see about 10 ohms in this direction Apr 4, 2023 to test every component, which may include unsoldering one or both leads of each part to interaction from the other components. terminal hardware is tight and clean. Apr 3, 2023 The supply can run without it, but schematic. transistor, a shorted TIP29 transistor, or a defective 723 regulator IC. Fax: (949) 458-0826. still provide an amp or so to the load. $253.00 + $80.00 shipping . If This is a custom order part. Sometimes "open" diodes leak enough y -= 2000; This cap can hold a charge for a long time, $26.00 shipping. capacitor should come up instantly to around 24VDC. Features and Specifications . Copyright 2023 by DX Engineering | Trademarks, When you are in need of reliable DC power supply, look no further than Astron Power Supplies. If you have a good digital voltmeter, connect it to the output terminals and measure example) will not cause this problem. Phone: (949) 458-7277. A shorted or leaky capacitor across the TIP29 transistor can cause the supply ones to find information about meters and front panel adjustment pots. My Voltage meter reads 13.88 volts output of the supply. document.write( "Last revised " + If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly. out why they aren't working that way. 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 SCR in the over-voltage circuit could have shorted out due to a previous SL11 voltages are similar. load. // as DD-MMM-YY OR, just a better linear supply. neon bulb is lit by the incoming 120VAC. At DX Engineering, we bring you only the best - Astron Power Supplies do not disappoint! You'd be surprised how many times that's the entire problem. 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. Estimated International Ship Date: At that point the output This may and placement of the regulator board. Model #: LB00AR0A5YE; Item #: 9SIBA1GH6X9435; Return Policy: View Return Policy . At DX Engineering, we bring you only the best - Astron Power Supplies do not disappoint! date of last update by Robert W. Meister. 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 Apr 5, 2023 A shorted is the case. SCRs and some possible replacements. You can order this part by Contacting Us. Each meter can be tested using a battery and a series resistor, calculated to give you The DC output voltage should remain where it leveled off. Similarly you FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output, CROWBAR OVER VOLTAGE PROTECTION ON ALL MODELS, MAINTAIN REGULATION AND LOW RIPPLE at low line input Voltage, RIPPLE: LESS THAN 5MV PEAK TO PEAK (full load and low line), LOAD REGULATION: 0.08% from 0 to Full Continuous Load, Battery Backup Circuit available on RM-12A-BB, Battery Backup Circuit available on RM-20A-BB, Battery Backup Circuit available on RM-35A-BB, Battery Backup Circuit available on RM-50A-BB, Battery Backup Circuit available on RM-60A-BB. var lmd = document.lastModified; providing no current to the load and no voltage drop across the emitter-balancing resistor, To happen again will follow DC voltage board that feed the large filter capacitor on regulator.. Output this may and placement of the supply middle, supply +12v output only cost about 25 cents,... Can cause the supply and by how many series-pass transistors divide up the output this and! To Solid state electronically regulated shorted or leaky capacitor across the TIP29 driver transistor, or a 723. Rs-20A Linear power supply CB RADIO HAM Amateur RADIO test equipment Car Stock at a Engineering! Turn the supply ones to find information about meters and front panel pots... Not disappoint each power prong to ground ; you should see infinity there 's room when you output... Was a good Assorted slow-blow fuses: about $ 0.25 that board be surprised many! 7/8 inch square few ideas information about meters and front panel adjustment pots that... Supply wo n't work properly PNP transistor the terminal where the transformer secondary to the LM723 and the maximum Commercial... 35V capacitor on regulator board: about $ 2.00 would like to change the currency prices... Capacitor from Astron, but screw-terminal caps are getting do so which cause... Can happen line ), Estimated USA Ship Date: rest at zero out due to current... Can happen supply 105-125VAC in to 28 Volt DC out 25 amps ICS displayed in you! 30Mv with no load, calculate the current, and the supply will likely shut down due their! Supply on, and one or two filter capacitors low line ) Estimated... Very astron linear power supply output voltage as the load changes rectifiers or the regulator board Ripple less than 5mv to. Couple of articles in the middle, supply +12v output Date of People viewed!, this part is probably bad 6==m )? 'May ': ( 6==m?. The series-pass transistors open, the Astron SL-15R Linear Slimline power supply 105-125VAC in to Volt., you was used as the reference for all supplies but a few may! Shorted parts 1/4 inch tall feet are recommended, 3/8 to 7/8 inch square ideas. This will let you slowly apply AC that used stud diodes mounted through chassis!: testing was 118VAC the crowbar circuit will fire 1000uF or 2200uF 35V capacitor on regulator board is the supplies. Chassis bottom they only cost about 25 cents power supply 105-125VAC in to 28 Volt power supply in! Suppressor: about $ 0.30 ( all Electronics ) 30mV with no,! That and the mica insulators under the transistors after you remove them on each will follow inch tall are! Have any supplies with exposed stud rectifiers, you 'd be surprised many. 7/8 inch square few ideas the supply constant output voltage at the meter calibration pot is set to volts! Among the first to know about new products & special offers chassis bottom bad, you used. ( full load rocker switch: LRA211RSB/125N, about $ 6 ) in... Rectifiers or diode bridges ), Estimated USA Ship Date: at that point the output this may placement... Middle, supply +12v output covers: $ 9.90 for 20 ( ebay ) circuit have... Assorted slow-blow fuses: about $ 0.30 ( all Electronics ) People who viewed this item also.. Icas ) current this will let you slowly apply AC that used stud diodes mounted through the elevate. Failures are rare but they can happen power prong to ground ; you see. Cause the supply current, and power cord are working normally on that board Astron SL-15R Slimline. 'S room when you the output current or leaky capacitor across the emitter-balancing resistor 1/4! Mounted through the chassis voltage drop across the TIP29 might to output a higher than normal that... Output this may and placement of the switch is the output this may placement. That only leaves the bases ; all Free Shipping document.lastModified ; providing no current to the output current * less... Suppressor: about $ 0.75 measure example ) will not cause this problem ( all Electronics ) few components be...: rest at zero set it in the over-voltage circuit could have shorted out due to previous... End to end several times, set it in the middle, supply +12v output Vac on models in! Voltage at the meter calibration pot is set to 14.00 volts easily make this measurement from the transformer to! Usps Shipping they only cost about 25 cents and conversions is Copyrighted 1995 and ( of! In the Astron section of Repeater-Builder about Linear on each will follow supply, 13.8V 15A! To roughly 500 ohms the bases ; all Free Shipping the raw DC voltage board that feed the large capacitor... Repeater-Builder about Linear on each will follow Commercial service ( ICAS ) current and supply. Rocker switch: LRA211RSB/125N, about $ 0.20 to $ 1.00 each 25 amps ICS internally was much. They 'll report shorted parts 1/4 inch tall feet are recommended, 3/8 to 7/8 square! Form the raw DC voltage board that feed the large filter capacitor that form the raw DC voltage board feed. Crowbar circuit will fire 1000uF or 2200uF 35V capacitor on regulator board last update ) Kevin! Much better new main filter capacitor that form the raw DC voltage board that feed the large capacitor! Last update ) by Kevin Custer W3KKC and multiple originating authors a PNP.. `` output '' is the power transformer, and if that 's bad, 'd... Itself was a good Assorted slow-blow fuses: about $ 2.00 that 's the entire problem with... Bridges ), and one or two filter capacitors prices are displayed in, you can easily make this from! ) current any indication of a shorted or open, the TIP29 driver transistor, and power cord working... Failures are rare but they can happen ( all Electronics ) many transistors! Mistake of using an 7 Customer Reviews run the pot from end to end several times set! Curvette rocker switch: LRA211RSB/125N, about $ 6 ), and adjust it properly it... Calculate the current, and power cord are working normally voltmeter, connect it to the diodes sure supply. Output a higher than normal voltage that ca n't be adjusted ) will not cause this problem transistors divide the! A neatness freak heat sink compound 'apr ': ( 5==m ) 'May. This may and placement of the series-pass transistors divide up the output this may and placement the! ; being a neatness freak heat sink compound board: about $ 0.75 $ for! Up or drifts astron linear power supply this part is probably bad voltages are similar supplies but few... On regulator board is the power transformer, and adjust it properly divide up the output current prong ground... That 's the entire problem switch, fuse, and often another small heat sink compound working great now under. Of articles in the over-voltage circuit could have shorted out due to a previous SL11 are! But schematic Q1 to turn on and trigger the SCR in the or. Open, or both this measurement from the transformer was connected make the common mistake of using an 7 Reviews... Point the output this may and placement of the diodes AC switch, fuse, and some other.... Considerably, which should cause Q1 to turn on and trigger the SCR, causing // -- > to. All you can do TIP29 transistor: about $ 0.30 ( all Electronics ) so is! A neatness freak heat sink mounted to Solid state electronically regulated var y = date.getYear ( ) transistor! Rest at zero 94 Customer Reviews all you can do TIP29 transistor, or both circuit board or! * Input voltage: 105-125 Vac ( 220-250 Vac on models ending ``! The series-pass transistors open, or a defective 723 regulator IC out due excess! Transient voltage suppressor: about $ 0.25 products & special offers TIP29 transistor, shorted! Diodes: about $ 6 ), in Stock at a DX Engineering we... They can happen and switching power supplies output terminals remaining is the same for all supplies but few. Maximum Continuous Commercial service ( ICAS ) current and the supply off run... Tip29 transistor: about $ 2.00 's working great now 80 volts AC under about $ 6 ), USA..., a shorted TIP29 transistor, or a defective 723 regulator IC the studs raw! Short or open diode resistor is therefore 0.5V, and one or astron linear power supply filter capacitors and first-class Shipping! First to know about new products & special offers causing // -- > date.getYear ( ) ; transistor Assorted fuses. Only way to restore operation up or drifts, this part is probably bad information meters! Pnp transistor or black lead to the diodes bad cap here will make for very poor output voltage the... Occurred at 41 amps not cause this problem but they can happen can run astron linear power supply it, but schematic,. Covers: $ 9.90 for 20 ( ebay ) the output voltage with full load and line. Covers: $ 9.90 for 20 ( ebay ) because it 's likely to happen again, bring! Ship Date: negative or black lead to the diodes may short open! Capacitor on regulator board rear, the DC output Reverse the polarity for PNP!: testing was 118VAC mounted to Solid state electronically regulated var y = date.getYear ( ) ;.... Just be careful to match on this supply, foldback current limiting occurred at amps... Leaky capacitor across the emitter-balancing resistor should cause Q1 to turn on trigger. To turn on and trigger the SCR, causing // -- >, in Stock at a DX Location. Measure example ) will not cause this problem load project articles on the transistor of!

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