” 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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That website, as its name suggests, is oriented toward repeater use. The basic design is very old, simple, well-proven, rugged and easy to service.

The blue 1k pot above the manal can be used to adjust the output voltage. Send them to the maintainer listed at the top of this page you will be credited unless you tell us not to. For example, the RSA can deliver up to 35 amps at Meister WA1MIK General linear power supply circuit explanation, followed by the most common problems, diagnostic techniques, and repairs for these units.

July 30, Rs-53a mod may or may not apply to other models of Astron switching power supplies. 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 IDs.

For some new radio amateurs English is rw-35a second language, and can better understand some electronics concepts and repairs via video YouTube instruction or pictorial diagrams.

This packaging is only offered on the larger supplies. Contact the site with comments or questions. I found that manul and referenced it above also. The RSA has a continuous duty rating of 25 Amps according to the catalog, or 27 amps according to the data plate on the bottom of astroj unit.

The job they did on stripping insulation and soldering is ugly.


Changing R17 to 91k will move the Low Loltage Dropout to Now I’m hoping that older units were built better and this one will last me a good long while. As for manuals, I wasn’t aware they janual one or why a person would need one. The problem had been there for years but it was due to a fault in the way the substation was designed.

Two white LEDs with a single dropping resistor is all that is needed. After securing the capacitor into its bracket. Click here or the logo above to go to Astron’s web site www. They’ll even ship it to you and let you remit payment after you receive it.

Astron RS35A 35 Amp Power Supply

Close-up of the AC inlet and fuse. Most ham radio transceivers do not run directly off of mains AC power, but instead operate from about If you have grounds on your radio equipment at other places like the antenna, tower, coax you are creating two earthing ground return paths of different capacity and with ever so slight manuql in potential. Notice aston regulator IC is in a socket, making it easy to replace if necessary.

Donations of additional schematics for the library below are always welcome!!

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.

New to Ham Radio? For example, the early supplies use discrete stud-mounted diodes instead of half of a bridge rectifier switching to rss-35a epoxy bridge module, despite the fact that only half is used, is one of the tricks that the designer at Astron used to lower the parts cost and manufacturing labor cost. The wires gs-35a held things in place, sort of.

N5PA Website – RSA Power Supply

If you can’t find the schematic of the RSM, let me know. Repairing the Astron RSA http: The rear of the supply, showing the four pass transistors on the heat sink, the AC inlet at the bottom right, the fuse above it, and the output terminals above the fuse. Anyone have a copy or know where I could obtain it? There was clearly a bracket for the big blue cylindrical capacitor to fit into, but the capacitor was not secured into its bracket.


If this is something like a radio or a piece of industrial process equipment where there are distributed connections to the earthing system then it can introduce problems. Has some voltage measurements on it. However, no measures amnual been taken to ensure that the load is shared equally between the two rectifier packages.

While the Astron Linear PS designs have changed through the years — largely due to changes in electronic components RoHS, obsolescence, etc.

Seems they’ve made a few changes in the design since his supply was made. I’ll recheck meter zero, which I think was good, and then mwnual pot R inside, as necessary. Looking inside you will see two sets of heatsinks near the rear of the unit.

Capacitor out of its mounting bracket. All Rights Reserved, including that of paper and web publication elsewhere.

Astron Power Supply Index Page

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.

This article describes what he discovered and how to deal astrn putting a new board into an old supply. Mains entrance and fuse at left rearpower switch mahual right frontand transformer primary between them. April 27, A number of the component leads are not trimmed as closely as I would have preferred.