” 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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If you need to rack mount a smaller one, just use a rack shelf.

N5PA Website – RSA Power Supply

Everything else gets replaced with a completely different design. The basic idea of a linear power supply is to rectify AC into DC to charge a big capacitor at around twenty-five volts or so, with a fair bit of ripple at Hz. Check some other schematics if you can’t read the one for your particular supply as they’re very mannual. Powered by SMF 1.

A new series of videos is mwnual posted for common repairs and educational for troubleshooting. 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.

The Astron model numbers include their peak current rating. You get much less current at a lower voltage. Seems they’ve made a few changes in the design manua, his supply was made. New to Ham Radio? The basic design is very old, simple, well-proven, rugged and easy to service. I have seen this happen with a substation where we have this gigantic buried ground mesh.

A trailing “BB” indicates the Battery Backup option. There was an extra “line” drawn between the collector of the TIP29 and the base connections of adtron pass transistors. Click here or the logo above to go to Astron’s web site www.


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 manuap they don’t have electronic copies of their drawings and they don’t know how to email them.

Numbers in many of the schematics below, particularly the pin numbers on the regulator Rs-35q, may be blurry. I purchased my supply from HRO in February of Astron has since added some parts to the design; these are NOT reflected in this schematic or the parts list below.

Astron RS35A 35 Amp Power Supply

The last I checked Astron website had schematics of all their linear power supplies. Another way of saying it is that this is a ground inverting unit.

Apparently the screw on the bracket had never been tightened, and things had been dislodged a bit during shipping. I had called Astron but they were not very helpful, only saying “it depends” and not offering any rationale. The blue 1k pot above the regulator can be used to adjust the output voltage.

A trailing “” indicates the supply operates on V line voltage. Primary Menu Skip to content. 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. Many repeater owners try to be conservative, and keep the actual current draw from their supplies well below the rated maximum, in an effort to make the supply run cool and last long.

On further searching, I found a wealth of info here: August 14, The continuous current is somewhere between 50 and 80 percent of the peak current. Before installing this mod simply running my PII on receive was enough to turn on the fan every 5 minutes or so. The negative side is common. Open the supply after mxnual disconnecting AC power and allowing for DC voltage to bleed down. If you bridge the thermostat with a two watt resistor of 75 to ohms the fan will be on continuously, but very slowly.


It also has a rs-35z detailed parts list at the end.

Their schematics are further down the page. While the Astron Linear PS designs have changed through the years — largely due to changes in electronic components RoHS, obsolescence, etc.

Astron RSM Manual

SS- series are Small Switching power supplies. Tell them the supply model number and they’ll customize it for you. Donations of additional schematics for the library below are always welcome!! I recently purchased the venerable Astron RSA, one of the most astgon amateur radio power supplies. April 26, Unfortunately this is important because if one chooses to buy replacement parts from Astron they according to Astron need only supply the model and component Sr-35a.

Capacitor out of its mounting bracket. There was clearly a bracket for the big blue cylindrical capacitor to fit into, but the capacitor was not secured into its bracket. However, switching power supplies generate electrical noise which can interfere with radio operation.

I’m thinking maybe the Astron should be set that way too if iCOM designed their “system” that way. It shows a 7 amp load. A trailing “M” indicates front panel Meters. Older units had a fixed cord, but current units use an IEC power inlet.

Use a recent version of the Adobe Acrobat reader and just mouse over the yellow folder symbols. I fully expect mine to last a lifetime. Close-up of mains entrance and fuse.