Tag Archives: power supply

Project Epsilon: Linear Regulated Power Supply from Spare Parts

Belgian engineering student Gert-Jan built a great looking, and functional, linear regulated power supply for a test bench from an old radio transformer and a handful of supporting parts. This is a pretty nice looking adaptation of the common LM317-based … Continue reading

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Oregon Electronic Model A3 Variable Voltage Regulated Power Supply

Here’s another project I just finished at Rain City Audio:

This vacuum tube power supply from an engineer’s test bench can replace a radio or test circuit’s power supply to help with troubleshooting or experiments, with up to 400V for B+ and 6.3V 5A for the heaters. It needed some new capacitors, then fired right up and works perfectly! Continue reading

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Don’t Trust Everything You Read (On Old Radio Schematics)

Electrical drafting is primarily done on a computer today, with software such as EAGLE or KiCAD. This wasn’t the case back when tube radios ruled the airwaves, though – schematics were drawn up by engineering draftsmen by hand. And as … Continue reading

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Antique Car Radio Repair: the 1951 Firestone 4-B-31 “Roamer” Vibrator Radio

A local friend is building a rat rod out of 1920s-1950s parts, a custom collection that ultimately will turn into a very fast car powered by a huge V8. He found a vintage car radio to go with it, the … Continue reading

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YAMR [Yet Another Monitor Repair] ViewSonic VP191b

A little while ago, I picked up a set of seven LCD monitors in various states of not working  to work on repairing and maybe eventually reselling. The first one was quite easy – it just needed a wire reconnected … Continue reading

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Westinghouse LCD Repair

After seeing the repair I made on the Samsung LCD monitor, a friend gave me a few-years-old Westinghouse LCD/TV that had quit working – it wouldn’t power on anymore. It’s a Westinghouse SK-19H210S, 19″ LCD accepting VGA or HDMI up … Continue reading

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Adventures in Dumpster Diving: Samsung 225BW LCD Repair

I found a Samsung 225BW LCD sitting on top of my apartment’s dumpster, and figured I’d drag it upstairs. It’s a few year old model but it’s better than the current older Dell LCD that I’ve been using (1680×1050 versus 1440×900). … Continue reading

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