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Old February 9th 19, 12:43 PM posted to
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Default Astron RS-12A Repair Help

Introductory Information on Astron Power Supplies
by Repeater Builders Technical Information Page (RBTIP)
* Compiled from a number of different sources *

Schematics and Service Information on Astron™ Power Supplies
by Repeater Builders Technical Information Page (RBTIP)

Regulated Linear Power Supply Construction
What's inside your Astron®?
by David Metz, WA0AUQ

Power Supply Analysis using Astron DC Supply
Hands On Radio, QST magazine
by H. Ward Silver, N0AX
The Illuminated Rocker Switch, used as Power Switch on Astron RA and RM-series DC power supplies,
The Neon Bulb within the switch series has a lifetime of ~20 years, comparable to LED devices.

Astron uses the appliance standard-sized (.480" x 1.072"; 12.19mm x 27.23mm) switch cutout.
Illuminated (neon) Rocker switch, LRA211-RS-B/125N (translucent red).

This switch size is widely available from electrical, electronic, appliance part distributors
(Mouser, DigiKey, Newark, Allied, Future, NTE Electronics, GC Electronics/Waldom) and
manufactured by: C&K, Carling, Cherry, Alcoswitch, and numerous Eastern Asia shops.

I have seen prices for this illuminated Carling LRA211 Rocker Switch from $2.00 to $15.00 each.
BE a SMART Shopper.
The higher priced rocker switches are usually found at electrical or appliance distributors and
"convenient” retail hardware locations (example: Jandorf brand name).

NTE Electronics : Illuminated Rocker Switches
PART Number: 54-065, this is the Carling LRA211-RS-B/125N (translucent red)..

GC Electronics product (35-3740) is a good compromise of price and convenience. Catalog 120407 294.pdf

The GC part (35-3740) is the Carling “Curvette” LRA series, specifically LRA211-CR-B/125N (ruby red)
LRA211: 125V Neon Lamp; 16A 125VAC; .250 QC Tabs; OFF-NONE-ON (SPST); Red Clear, Black bezel.

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Old February 9th 19, 01:17 PM posted to
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Default Astron RS-12A Repair Help

Test a Transistor with a Multimeter.
Written by Eli, Vetco Electronics
by Thursday, May 04, 2017.

Ask any field or bench technician what their most-used piece of test equipment is and
they will probably say a VOM (VoltOhm Meter) or DMM (Digital MultiMeter).
These versitiale devices can be used to test and diagnose a wide range of circuits and components.
In a pinch, a DMM can even substitute for expensive, specialized test equipment.

One particularly usefull skill is knowing “How to Test a Transistor” using a Digital Multimeter.
Specialized component analyzers exist to do this task, but the expense can be difficult to justify for the average hobbiest.

For ASTRON DC Power Supplies, you can TEST:

1.) Pass Transistors (2N3055 or 2N3771) on Rear HeatSink.
2.) Diodes and Bridge Rectifier used on the 18 VAC secondary from transformer.
3.) For Continuity and Shorts.

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