He scanned then redrew and corrected the schematic so it matched the actual unit this drawing Stu opened his brand-new supply and took several photos, showing what's been added or changed. Refreshing / Maintaining Astron Linear SuppliesĬommon maintenance things you can do to keep your Astron supply running for many years to come.Īn evaluation of a 2009 Astron RS35M supply How to deal with putting a new board into an old supply. This article describes what he discovered and Improvments in the design since his supply was made. Installing a New Regulator Board in an Old Astron PowerĪfter his regulator board burned up, Tom bought a new one from Astron. Troubleshooting Astron Linear Supplies by Jim Ussailis W1EQO (630 KB PDF)įrom the Yankee Clipper Contest Club's 'Scuttlebutt' newsletter Issue 232, August 2015. If your browser does not pop the notes then download the PDF and use the free downloadable Adobe Acrobat Reader to open it. Just mouse over the yellow folder symbols and they will pop up. The QST article and the annotated PDF are really worth studying. Took that QST article and went one step better - he produced an annotated schematic that takes advantage of the annotation feature of the PDF file architecture. Jim Larsen, AL7FS (the ARRL Alaska Section Manager) The December 2005 issue of QST had an article in their 'Hands-On Radio' series titledĭownload a PDF of the QST article - it explains how a linear power supply works, and uses an Astron

General linear power supply circuit explanation, followed by the most common problems,ĭiagnostic techniques, and repairs for these units.Īnnotated RS35M Schematic by Jim Larsen AL7FS (169 KB PDF) Repairing Astron 13.8V Linear Supplies by Robert W. We'd appreciate an email if you discover a change. Some wereĬhanged during updates, some were not. Only as they were relevant at the time of the initial writing of these pages (around 2004). There are prices mentioned in a few places on these Astron web pages. The Astron factory says that their '28 volt' supplies will adjust down to 22-23 volts (for use with '24 volt' loads). Regulated Switching Voltage Converters (DC-DC converters) Quick Jump to: (the Modification Articles include battery backup modifications) It has some very useful information on the Astron linear and switching power supplies, withīackground, history, model-specific information, both repair and modification suggestions, Information article before any of the other articles here in the Astron section. The Pyramids are also based on the popular 723 voltage regulator.ĭONATIONS OF ADDITIONAL INFORMATION FOR THIS PAGE WOULD BE GREATLY APPRECIATED. The Pyramid Gold Series linear power supplies are similar in design and capacity to theĪstron supplies and have their own web page at this web site. The basic design of the linear supplies is straight out of the chip manufacturer's Applications Notes for the 723 regulator chip. There is no connection to the Astron Corporation that makes power supplies.Īstron has been making and selling linear power supplies since 1975, DC-DC converters since 1980 and switching supplies since 1996. (formerly Astron Antenna Co.) in Virginia, USA that makes (made?) some nice antennas. Note: there is (was?) an Astron Wireless Technologies, Inc. Off-site pointer (opens in a new browser tab) Questions or Tech support: astron /at/ astroncorp /dot/ comĬlick here or on the logo above to go to Astron's web site

Sales or purchase questions: sales /at/ astroncorp /dot/ com Modifications,Schematics and Service Information on Astron™ Power SuppliesĬompiled, HTML'd and Maintained by Mike Morris WA6ILQįormerly Maintained by Robert Meister WA1MIK (SK)

Transistor tester schematic