Tag Archives: electronics

The Speaker Spotter — July 10, 2026

Posted on July 10, 2026 by retrovoltage

A recurring feature curating interesting speakers for sale on Craigslist from around the Pacific Northwest. Links to Craigslist postings might go down at any time if they’re sold or pulled from sale. There’s a few interesting things in here today, … Continue reading →

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How to Buy Capacitors on Mouser.com

Posted on June 29, 2026 by retrovoltage

Learn about searching for electrolytic, film, and ceramic capacitors on popular parts house Mouser.com, with examples to help you get started selecting the right parts. Don’t risk counterfeit parts from 3rd-party suppliers – go right to the source! Continue reading →

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Everything to Know about Bose 901 Series I and Series II Active Equalizer Repair & Speaker Systems (and the 800, too!)

Posted on June 12, 2026 by retrovoltage

A deep dive into the tips and tricks for repairing the Bose 901 Series I and II, plus the Bose 800 Series I and II, along with a discussion of their history and variations, sourced from direct experience repairing more than 500 examples. Includes schematics and parts lists. Continue reading →

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Upcoming Projects for 2026

Posted on June 2, 2026 by retrovoltage

Having had a chance to unpack some of my shop from storage and settle in to the new space, I’ve got an idea of what projects I’ll be working on myself in between projects with my shop partner. Bose Active … Continue reading →

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Are Kids the Future of Ham Radio?

Posted on November 22, 2015 by retrovoltage

Bob K0NR has an alternate take on how to keep ham radio alive as many of its practitioners age up: For whatever reason, it seems that most people find themselves in a situation as an adult that causes them to say … Continue reading →

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Vintage Engineering is Beautiful

Posted on October 30, 2014 by retrovoltage

EL84 output tubes in an EICO HF-81 integrated stereo amplifier.

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Refurbishing a Capacitance Tester

Posted on January 20, 2011 by retrovoltage

Parts Express sent me an advertisement for a $45 capacitance meter today. This actually a pretty good deal, and it’s a useful thing to have around if you’re doing electronics work. I’d probably have bought one myself, if I didn’t … Continue reading →

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Meter Clock Roundup

Posted on December 7, 2010 by retrovoltage

Meter clocks are interesting works of geeky art that display the time using analog panel meters driven by a microcontroller. They can be strikingly artistic – and are getting to be very popular. There are a lot of homebrew designs … Continue reading →

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