Ampeg Bass Amp Repair Part 1 3

I’ve had my uncle’s broken Ampeg SVT-4 Pro sitting down in my electronics lab for a couple of years now.  The story was that the amplifier failed before a gig, with output being practically nil, but just barely audible.  Not long after it stopped working, we tried a few simple things to fix it to no ...

Custom Droid Car Dock 1

My passion for in-car tunes goes back well over ten years, with the a half-finished (but functional) automotive MP3 player that could emulate a BMW CD changer.  It seems so quaint now, but it’s key to remember that those were the days before the iPod even existed!  After receiving an iPod as a gift in ...

Big Ostentatious Power Switch – Experiment #1

I’ve been starting to think about making an enclosure for Mike’s UCD400 amplifier kit.  I want to use my new CNC toy, obviously, and make something really special.  So I had an idea the other night.  In the middle of the other night.  For which I was awake for several hours thinking about the details.  ...

The SOHA Headphone Amplifier

Back in the summer of 2007, I constructed a kit of the SOHA (Stoopid Op-amp Headphone Amplifier), based on the PCB from Glass Jar Audio.  The amp has acted as my workhorse for my office headphone setup since then, and I’ve been quite pleased with it, despite a minor complaint or two.