” TIP CAS. I ca IN ICAO. PвKE. | 39A. LM CR3 |. 3 A4. | IN 1 tci +. CI01 +. R8. 3 K. 10v. SCRI I. Astron Observations. Longevity. Family of RS supplies – all the same design Astron RSM Astron is inconsistent – some do, and some don’t. Don’t rely on . Here is an annotated schematic of the Astron RSM detailing the workings of the various parts of the Astron circuit. The annotations were originally written in.

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It is a totally separate operation with no connections to the Astron Corporation that makes power supplies. Astron makes both linear and switching power supplies, and some other products. You should read this Astron Introductory Information article before any of the other articles here in the Astron section It has some very useful information on the Astron linear and switching power supplies, with background, history, model-specific information, both repair and modification suggestions, photos, and more.

The Pyramid Gold Series linear power supplies are very similar in design and capacity to the Astron supplies. Both are based on the popular LM voltage regulator integrated circuit. Just remember to print the page and leave a copy inside the case so the next guy will know what the little circuit on the piece of perfboard is for.

Seems they’ve made a few changes in the design since his supply was made. This article describes what he discovered and how to deal with putting a new board into an old supply.

A look at the Astron RSA – AG6QR

He scanned then redrew and corrected the schematic so it matched the actual unit; amnual drawing can be found as a PDF file below. Everything else gets replaced with a completely different design.

Meister WA1MIK General linear power supply circuit explanation, followed by the most common problems, diagnostic techniques, and repairs for these units.

Crowbar SCRs in Astron Use a recent version of manua Adobe Acrobat reader and just mouse over the yellow folder symbols. They’ll even ship it to you and let you remit payment after you receive it. Tell them the manaul model number and they’ll customize it for you. The blue adjustable potentiometer marked “1K” on the board visible in the component side photo above and labeled “R5” on the solder side photo above adjusts the power supply’s maximum output voltage, typically from 11 to 15 volts 22 to 32 volts on LS mmanual VLS power supplies.

See the article above for a more detailed procedure. Astron Linear Supply Battery Backup Modifications All the ashron and aston necessary to add a battery backup to your Astron linear power supply. Astron makes a stand-alone battery backup module that automatically switches to the battery source upon power failure. It also charges the battery and works with 12 and 24V systems. Make sure you print the mod sheet and tuck it inside the supply for the next guy.

Meister WA1MIK This modification adds a thermistor in series with the transformer, reducing the surge current and eliminating annoying circuit breaker trips on the larger linear power supplies. This same mod could be done to other high-power supplies. Very well written and chock-full of troubleshooting information. He replaced them with digital meters and created a web page about installing them.

The meters he bought were a type that required an isolated power source for the ammeter, and the article includes a schematic and photo of the isolated 5vDC source that he build on perfboard. Replacing or Adding Digital Meters to Astron Simple to do and easily reversible. Implement one or both. Please realize that you will find multiple different schematics listed below for the same supply as the designs changed over the years due to parts availability, circuit improvements, etc.


For example, the early supplies use discrete manua diodes instead of half of a bridge rectifier switching to an epoxy bridge module, despite the fact that only half is used, is one atron the tricks that the designer at Astron used to lower the parts cost astrln manufacturing labor cost. You may have to download more than one schematic to get the one that matches your supply, and you may not find your schematic at all as we only have the ones that were donated to us.

If you have one that we don’t, please consider sending us a scan or a Xerox copy. When or if you find the schematic that matches your unit I suggest you print it and stuff a copy inside a plastic page protector, and tape it to the underside of the lid of the power supply cabinet! Several folks have mentioned in emails and on mailing lists that you can call Astron on the phone and you will hear them tell you that they don’t have electronic copies of their drawings and they don’t know how to email them.

Trust me, the person that answers the phone will be amazed when you tell them that the drawings from different years for the same model power supply show some different component IDs and values.

Unfortunately this is important because if one sstron to buy replacement parts from Astron they according to Astron need only supply the model and component IDs. Fortunately everything but the filter caps, transformer, and sheet metal are common Mouser or DigiKey wstron, and I bet you could find the capacitors if mznual tried mannual enough.

Astron has to get them from somebody. Supplies rated for 12A or less RS and under usually have 3-way binding posts on the rs-35q for output terminals. Some of the Slim-Line supplies have a cable and connector appropriate for the radio to which it would normally power. The model number is constructed from a prefix lettersa peak current value digitsand a suffix letters.

Look for a schematic based on the current value first.

The circuitry is similar for the different prefixes and suffixes. For example, the Variable power supplies with front panel controls just add two pots. Any supply could have meters added, if they’ll fit on the front panel. These don’t affect the basic circuitry. An “RS-” prefix is a standard desk-top Regulated Supply. This packaging is only offered on the larger supplies. If you need to rack mount a smaller one, just use a rack shelf. Usually there is little if not zero electronic difference between the RS- series and the similar RM- model.

Converting a RS or RM to a VS or VM usually involves adding two potentiometers to the front panel and making the wiring changes shown in the schematic. See the article elsewhere on this page. SL- series are Small Linear power supplies. Their schematics are further down the page. These have room for a two-way radio to be mounted inside the cabinet.

Check the catalog pages on Astron’s web site for all the details. SS- series are Small Switching power supplies. SLS- are Switching Special-voltage power supplies, usually 28 volt. A trailing “A” seems to be the default if there’s no other suffix. Some supplies have this, some don’t. A trailing “R” seems to be used for power supplies that were sold with a chassis that could accept a mobile radio, usually only found on the SL-series.


A trailing “M” indicates front panel Meters.

Newer supplies possibly starting around have illuminated meters. If the supply has the “M” suffix, those under 20A usually only have room for just one meter. Slim-line SL supplies usually don’t have room for meters. A trailing “L” indicates there’s a cigarette Lighter socket on the front.

Astron VS-35M Variable DC Power Supply gets an upgraded MOSFET over-voltage circuit

A trailing “S” indicates there’s a Speaker inside the case. A trailing “BB” indicates the Battery Backup option. A trailing “RM” indicates Rack Mount, often for dual supplies. A trailing “” indicates the supply operates on V line voltage. Astron also builds custom supplies for GE, Astrob, E.

Astron RS35A 35 Amp Power Supply

Johnson, Kenwood, Motorola, Uniden and Vertex. The sleeve is sized so that a MaxTrac, Radius or GM mobile can slide into it; click here for a photo. A conversion list of Motorola to Astron model numbers can be found here. Donations of additional schematics for the library below are always welcome!! Send them to the maintainer listed at the top of this page you will be credited unless you tell us not to.

If you don’t find the schematic for your Astron below, then we were not given it. If you find one somewhere else that we don’t have, we’d appreciate a scan. Astron model numbers indicate the peak intermittent current that can be drawn from the supply.

The continuous current is somewhere between 50 and 80 percent of the peak current. The absolute maximum current where foldback limiting occurs is usually 10 to 30 percent above the peak current manuao. The available output current on VS supplies depends on the output voltage. You get much less current at a lower voltage. For example, a VS50M supply is rated for 37A continuous at The other VS supplies must be derated similarly.

This has to do with the power dissipation capability of the heat sinks and transistors on the back and sides of the supply. At lower output voltages, there’s more voltage across the transistors, so they get much hotter. Current foldback may also occur earlier at these lower voltage ratings, so beware. The Astron catalog has these derated current specs. Numbers in many of the schematics below, particularly the pin numbers on the regulator IC, may satron blurry. There is nothing connected to pin 8, so if you see something that looks like an “8” it’s most likely a “6” where the top got closed up.

The voltage charts on most of the schematics follow this scheme. Check some other schematics if you can’t read the one for manua, particular supply as they’re very similar.

The draftsman obviously started with the RS-7 schematic; he forgot to adjust the voltage table. It shows a 7 manua load. See the comments above on the battery backup feature. There was an extra “line” drawn between the collector of the TIP29 and the base connections of the pass transistors. This, effectively, shorted out the regulator driver Q2.