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

The other VS supplies must be derated similarly. The negative side is common. The sleeve is sized so that a MaxTrac, Radius or GM mobile can slide into it; click here for a photo. A trailing “A” seems to be the default if there’s no other suffix. It also allows a radio to operate easily off of 12V lead-acid batteries, or automotive electrical systems.

Astron Power Supply Index Page

All Rights Reserved, including that of paper and web publication elsewhere. See the article above for a more detailed procedure.

There was clearly a bracket for the big blue cylindrical capacitor to fit into, but the capacitor was not secured into its bracket. This has to do with the power dissipation capability of the heat sinks and transistors on the back and sides of the supply.


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.

Donations of additional schematics for the library below are always welcome!! The Astron catalog has these derated current specs. The draftsman obviously started with the RS-7 schematic; he forgot to adjust the voltage table. SLS- are Switching Special-voltage power supplies, usually 28 volt.

Maybe I need to try someone else there. As more current is drawn from the supply, more heat is produced.

A look at the Astron RS-35A

This astrpn what is known as a “ground loop” that can introduce AC hum in to the DC supply ground return leg. Repeater use puts demands on a power supply beyond those of a typical home user:. Tecsun 2p3 Final Thoughts.

Two white LEDs with a single dropping resistor is axtron that is needed. Capacitor out of its mounting bracket. If you bridge the thermostat with a two watt resistor of 75 to ohms the fan will be on continuously, but very slowly.

SS- series are Small Switching power supplies. The Astron website appears to only have a catalog and no support information.

Usually this would be much more pronounced on instrumentation loops industrial control with pressure transmitters operating off of a mA current loop for example. 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.


Since there are astronn voltages exposed on those terminals, things ought to be mechanically secured.

Astron VSM DC power supply

Open the supply after first disconnecting AC power and allowing for DC voltage to bleed down. August 14, The problem had been there for years but it was due to a fault in the way the substation was designed. 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.

Any supply could have meters added, if they’ll fit on the front panel. A few words about ratings: Slim-line SL supplies usually don’t have room for meters. Both are based on the popular LM voltage regulator integrated circuit. Looking inside you will see two sets of heatsinks near the rear of the unit. I had called Astron but they were not very helpful, only saying “it depends” and not offering any rationale.

A trailing “RM” indicates Rack Mount, often for dual supplies.