Homemade Oscilloscope

You wouldn’t believe how easy it is to turn an old TV into an oscilloscope. Snip a couple of wires and switch them around, then add an input jack and you’re away. In the video I’m displaying the audio from the TV tuner, but you can plug in any source.

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Weltmeister Combo Bass

My pal Vic has given me her Weltmeister Combo Bass keytar to reinvigorate. There’s not a great deal of info online so I’ll collate what I know here in the hopes that it will be helpful to someone else in the future.

Weltmeister Combo Bass
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4-stage Gated Oscillator

The first project I’m teaching in my DIY synth course is a 4-stage gated oscillator. It takes a couple of hours to put together, costs about $30 in parts, and is a good starting point for absolute beginners. So what’s going on in there?


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Electronic Audio Hardware

I’ve been reading Handmade Electronic Music by Nicolas Collins and it’s possibly the most informative electronics book I’ve ever read. It presumes absolutely no prior electronic knowledge of the reader, starting with the most basic introduction to circuit bending (think wet fingers inside open radios). He focuses on maximal fun for minimal effort and it’s late in the piece before he starts explain circuits of any appreciable complexity. For the most part these circuits are incredibly clever and pack a lot of functionality into a few components. I’ll be working through some of his suggestions and posting my progress here. A simple project that caught my eye was the DIY spring reverb (guitar amp -> cheap audio transformer -> piezo -> slinky -> contact mic -> amp). He also has a lot of helpful information on using CMOS logic as the basis of synthesisers and signal processors (something I’ve been reading a lot about lately).
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