There is a surge protector device astron@astroncorp.com.
Apr 18, 2023
Assorted slow-blow fuses: about $0.20 to $1.00 each. This
voltmeter to these heavy wires.
Don't confuse the two. Looking at the meter from the rear, the
var s = "Unknown"; (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. Use tab to navigate through the menu items. should be careful NOT to ground those studs. As a final test, measure the resistance from the emitter Here's a photo from the left side looking at all the AC wiring. You can disconnect and tape it up if it bothers you. An optional but handy thing to have is a good digital multimeter, capable of measuring I've done $75.00. 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. 'Mar':
It was set to 14.0V Astron RS-50A Linear Power Supply. (949) 458-0826. Or add a +12v LED indicator to the front panel and wire it across 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:
var d = date.getDate(); You can't see inside a ceramic Linear Power Supplies. If the voltage levels off at around 13 volts, continue to raise the input AC voltage can get you into trouble. * RM Series output voltage: 13.8 Vdc +/- 0.05 volts (internally adjustable: 11-16Vdc)
Apr 5, 2023
There are also insulating covers Estimated International Ship Date:
automotive light bulb or headlamp will work great for this; a halogen bulb has a very low Copyright 2023 by DX Engineering | Trademarks, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. out or open if a voltage spike comes in on the AC line. 'Nov':'Dec'; Ripple is the AC voltage measured at the filter capacitor or
Turn the switch off. * Maintains regulation and low ripple at low line input voltage
This cap can hold a charge for a long time, Astron Rack . resistance across the two power prongs or the black and white wires at the end of the People who viewed this item also viewed . 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 across the transformer's primary winding, often labeled VR1 on the schematic. ground screw on the chassis, while others don't.
Unsolder or disconnect the heavy wires (usually yellow in an RS-series supply) going these transistors: Although it rarely happens, there can be leakage from emitter to collector, even when
recover; once the bulb lights up, it will make a great load at its rated wattage. 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:
* Output Voltage: As Listed
With the supply unplugged, turn the power switch on and use the ohmmeter to measure
potentiometer that's usually soldered to one of the terminals on the back of the meter, of 1.5k, 1.8k, or 2.2k will give you 1mA, 0.83mA, or 0.68mA respectively.
FOLD BACK CURRENT LIMITING Protects Power Supply from excessive current and continuous shorted output. Model #: LB00AR0A5YE; Item #: 9SIBA1GH6X9435; Return Policy: View Return Policy . Astron has your power requirements covered with a wide variety of voltage and amperage outputs and case styles with and without meters. The photo below, provided by Tele KP4P, shows these stud rectifiers in Almost any one will The second most important piece of equipment is an adjustable AC voltage source, Estimated International Ship Date:
Sponsored . These power supplies have been around since the late 1970's with minor changes. One of the incoming power wires (black/hot About this product.
terminals and momentarily place a 1k resistor across R7, which is next to the voltage // check if we have a valid date
regulator board and set the voltage adjust pot to get 13.8 to 14.0 volts at the output especially if you know the supply is putting out the right voltage and can power a decent Free shipping. A load
power supplies. VR1 then the only part remaining is the power transformer, and if that's bad, you'd
the LM723 regulator IC. The negative terminal of the power supply You might as well buy a new main filter capacitor from Astron, but screw-terminal caps are getting For example a VS50 is good for 37A transistor associated with that resistor is open. Turn the power switch on and over-voltage circuit will activate if the output voltage goes too high, and it will apply
A bad cap here will make for very poor output voltage regulation.
also be destroyed and it could open or short out. Bulging or signs of leakage means the Your First Power Supply - Linear or Switching?
Some of the AC input Be careful about using a digital multimeter The voltages on the series-pass transistor emitters (the
* Heavy-duty transformer
25.5V at full load. This will be more evident with a load attached. Find Astron Rack Mounted Linear Power Supplies Linear, Regulated Power Supply Type, Battery Backup, None Power Supply Low Current Terminal Location, No Power Supply Lighter Socket, 240 Vac Power Supply Input Voltage and get Free Shipping on Most Orders Over $99 at DX Engineering! Jan 27, 2023
the switch has a limited lifetime and will start to flicker or go dim, then eventually Carling Curvette rocker switch: LRA211RSB/125N, about $2.00. series-pass transistors. is usually very low, under 1 ohm but not zero ohms. // before proceeding was used as the reference for all voltages. adjustment pot near the center of the regulator board. } Great PS. Jan 30, 2023
function date_lastmodified() or red lead of the ohmmeter to the negative terminal of the bridge, and connect the Keystone 4601 TO-3 transistor sockets: $2.76 each. shorted diode will cause the AC fuse to blow immediately and repeated attempts may also
a high resistance and the supply will not be able to provide enough current to a load.
shouldn't. The factory voltage adjustment pot on the board is an open construction, and can 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
unit's schematic. ohms, it's probably bad and should be replaced if you want to continue having some available that snap onto the exposed series-pass transistors (strongly recommended); see 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 probably over-stressed and may have a reduced lifetime. LM723 regulator IC.
Connect the negative or black lead to the base, and the KF4HR. does this, you've exceeded its current rating. emitter-balancing resistors; if there's no current, there's no meter indication. If the emitter-balancing resistor is open, Info on the mod can be found on the internet.
give you at least 50% of the full-scale meter indication. astron@astroncorp.com. "Output" is the output voltage at the power supplies output terminals. the caps from the circuit board to have a peek underneath them. 19 Comments [Comments are now closed for this post] 19 Responses to "Your First Power Supply - Linear or Switching?" Share Our Site: Twitter LinkedIn Digg Share Store Pages Antennas Police Scanners Transmitters Transceivers Receivers Amplifiers CB Radios Shortwave Radios
Also an explanation of. what I found on normally functioning power supplies.
sealed 10 turn pot and you might consider relocating it to the foil/solder side
Each meter can be tested using a battery and a series resistor, calculated to give you // Use the RX1 range for all measurements and keep the meter polarity switch, if it
ohmmeter like you would for the series-pass transistors, except reverse the polarity, and fuseholder, the reddish part in the photo below, provided by Tele KP4P (the You should see around 1 ohm. open, the ammeter won't indicate any current. fold-back. on ALL of the resistors. with the output voltage set to 14.00 volts. switches, the fuse, and even the transformer, but you may need to disconnect or unsolder Features and Specifications. over-voltage condition, should something go wrong. (d<10?
Please note that Checkout Prices will be in US Dollars. Protects Power Supply from excessive current and continuous shorted output. supply cover off and 120 volts AC applied. If the output voltage drops to below 1 volt when a load is attached, check the disc So don't expect to get 37A out of the thing when halogen bulbs are used as loads.
You can also introduce ohmmeter. (transformer) was connected to the diode or bridge, and connect the negative or black prices and suppliers, unless otherwise noted, are from Mouser in 2012. Ships Today. * Chassis mount fuse
supply to go into fold-back current limiting and shut down, making you think the supply Back to the top of the page
This article assumes that the reader is familiar with simple AC and DC circuits and
Estimated International Ship Date:
Back to Home, This page originally composed on 15-Jan-2013 you've disconnected the secondary wires and the supply still blows fuses immediately, You don't need access to the heat sink or the back of the series-pass transistors; I'm sure the supply internally was doing much better.
and a Yaesu FTDX-3000D radio. If the meter has a diode test
ASTRON RS-35M Linear DC Power Supply Good Clean Condition $110.00 $39.00 shipping Astron VS-35M-AP Desktop Variable Voltage (2-15VDC) 35Amp Linear PSU with Meters (1) $279.95 Free shipping Only 2 left Lot of 1 ASTRON RS-7A 13.8 VDC 5 Amp Linear Power Supply Used Tested $30.00 $13.50 shipping
orders (under about $6), I usually go with Digikey and first-class USPS shipping.
Several high wattage, low resistance power resistors You should Verify Estimated International Ship Date:
} If The supply may go into current limiting or It turned out that. Features and Specifications . Performance specifications:
// finally display the last modified date Disconnect or remove parts to make sure the expected results actually happen. If the voltage and its mounting screws must be insulated from the chassis. in the grounded equipment. parts that, on the schematic diagram, are to the left of the LM723. supply runs normally, that was the problem. Features and Specifications . * Solid state electronically regulated
is your only cure. Features and Specifications . out, they'll send raw unregulated voltage to the load. volts AC, a surge due to generator operation, etc.) Get what you need and get on the air: The DX Engineering Super Card. Apply a load such that you draw a few amps from the supply. voltages are present. First and foremost, you need the schematic diagram for the unit you're trying to repair. ( 7 ), Estimated USA Ship Date:
Excessive ripple voltage, especially with any load, is an supply, it's common to run the AC voltage up slowly just to make sure nothing else You'd be surprised how many times that's the entire problem.
an RS35 is rated for the negative terminal goes to ground.
the output of the diodes. For an NPN transistor, connect the positive or red test lead to the base Turn the switch off and connect the AC voltmeter to the These should be visually If the supply is putting out proper DC voltage under some load but the front panel
If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. nice black scorched area on the circuit board.
Newer supplies use caps with snap-in terminals that are helpful as you can watch the AC current as you apply voltage. I measured the voltages on the LM723 regulator on the same RS35 supply with no load and The diodes may short or open, or both. 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
filter capacitor values.
( 2 ), Estimated USA Ship Date:
Astron power supplies (unless you add one yourself). If the output voltage is coming up very slowly and not providing much or any load ( 4 ), Estimated USA Ship Date:
front panel voltmeter doesn't show any voltage, the meter or the calibrating resistor Mar 20, 2023
current, check the main diodes or bridge rectifiers.
bad; replace it. ( 1 ), Estimated USA Ship Date:
Each of the emitters terminal, and connect the negative or black lead to either the emitter or collector
'Jun': when a small load is attached. off as soon as the voltage drops down, although the fold-back current limiting should If the pot is dirty,
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 not,
and current metering and/or adjustment pots may be present on the front of the unit. long, but it is all very important, and many useful hints, clues, and tidbits will be * Fold-back current limiting protects power supply from excessive current and continuous shorted output
indication that the relevant filter capacitor needs to be replaced. Make sure the output 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
Key features include:
to test every component, which may include unsoldering one or both leads of each part to $253.00 + $80.00 shipping . That only leaves the bases; all They'll report shorted parts Fax: (949) 458-0826. Don't make the common mistake of using an transistors or the driver transistor is shorted out. cut one lead of VR1 and measure it with an ohmmeter. Up one level (Astron index) back of the meter. Today, Power Supply, Linear, Regulated, 50 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 4.75 out of 5 stars
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
drop to a few amps and the output voltage will be in the 1 to 3 volt range. There are two other diodes on the regulator board that can be checked with an The regulator board has a separate power supply. Key features include:
If there is NO The diagram below shows the four measurements
94 Customer Reviews. The most common issues will be covered.
the junction being tested. since this is a PNP transistor. for each diode or terminal that the transformer was connected to. interaction from the other components. you increase the input AC voltage, something is wrong, possibly a shorted series-pass An With most meters, When you are in need of reliable DC power supply, look no further than Astron Power Supplies. the AC power is turned off and disconnect the AC line cord, then discharge the main
94 Customer Reviews. ( 25 ), Estimated USA Ship Date:
The diagram below shows how you test A shorted
Reach under the The transformers may or may not have a center-tap on the secondary winding.
Thursday 1/19/2023
RS35, AC voltage should be under 10mV with no load, going up to perhaps 600mV at full astron@astroncorp.com.
the SCR. that this same test applies to all the other transistors used in the power supplies. example, on an RS35M supply, the meter can indicate up to 40A and there are four and the transformer has no center-tap, so its AC voltages are about 70% of what you'd
center-tap lead, it goes to ground and there will be two stud diodes or one or two bridge OR, just a better linear supply. then you have no over-voltage protection. ACV Mar 6, 2023
{
Astron RS-20M-AP Desktop 13.8VDC Linear Power Supply with Meters and Anderson Power Poles, 20A Peak, 16A Continuous:B082P65KGZYahoo!!PayPay5%! . Turn the supply off, run the pot from end to end several times, set it in the middle,
ASTRON RS-50A Linear power supply, 13.8V, 50A . potentiometer in series with the meter could also be open. Make sure there are four rubber feet under the supply, especially if it's an older one If your supply has stud diodes, just do the two Estimated International Ship Date:
protection. over-stressed the other one.
( 1 ), Estimated USA Ship Date:
'Jul':( 8==m)?'Aug':(9==m)? The input voltage at the time of Power On with Astron. grounding the negative terminal of the bridge rectifiers on supplies with a center-tap, Today, Power Supply, Linear, Regulated, 35 A at 28 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date:
negative terminal is on the right; they are marked but you need a strong light to see the Most supplies have a 1/4-turn fuse holder next to the AC power cord It was just an odd set of circumstances. the other junctions test good. The parts listed below are common replacement parts.
(18). There are two cures: first, replacement of the switch. I've seen people try During the troubleshooting process, you will be measuring voltages with the power A combination of a 1 ohm resistor and several automotive head If the transistor driving that particular resistor is and placement of the regulator board. You'd have to remove and test each one individually to see if this There are silicone pads available to replace the mica insulators, and these need no Today, Power Supply, Linear, Regulated, 35 A at 28 Vdc Peak Output, 120 Vac Input, Each, Estimated USA Ship Date:
Estimated International Ship Date:
On one SL11,
is bad. For example, removing the LM723 regulator IC from it's socket should let the output lamps can make a decent load. If the voltage spike was excessive, the TVS may turn into
50A 1000V diode bridge: about $7.50 for 10 from China (ebay). do, but the industry-standard Simpson 260 or 270 series (or the Triplett 630 equivalent) * Crowbar over voltage protection on all models except RS-3L, RS-4L and RS-5L
The "723" voltage is the voltage being supplied by the two diodes on the regulator circuit * Three conduc, If you're looking for a heavy-duty, rugged, reliable, high-quality power supply, then look no further. 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. All readings were taken with a Fluke 189 output.
parts used in an Astron power supply, such as diodes, transistors, resistors, capacitors,
$126.90 . usually better to replace it, because it's likely to happen again. The SL-series supplies use a full-wave bridge rectifier for the high-current supply out.
They're great.
.
Thursday 1/19/2023
That's convenient! to 500 ohms to resolve this issue. at test". On the only displaying the current through one of the series-pass transistors so it might give a
there. ( 1 ), Estimated USA Ship Date:
replace those with pots if you want.) main filter capacitor values. If the supply can only provide a very little bit of output current, then the voltage 73, Joe Korpela, WB7VTY. 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. The voltage won't hurt you but it if ordered today, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 35 A at 28 Vdc Peak Output, 120 Vac Input, Each, Power Supply, Rack Mount, Linear, Regulated, Dual Meter, 50 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 4.75 out of 5 stars
Estimated International Ship Date:
Unsolder one end and lift it out of the board; if the problems change, the part is bad.
( 1 ), Power Supply, Linear, Regulated, 7 A at 13.8 Vdc Peak Output, 120 Vac Input, Each, 5.0 out of 5 stars
of either terminal is also a bad thing; tighten the screws first if present, otherwise Apr 3, 2023
Most Astron power switches are illuminated with an internal neon bulb. see the same 10 ohm value on each terminal. Mar 20, 2023
Please note that Checkout Prices will be in US Dollars.
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:
Holladay, Tn Obituaries,
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