Thursday, January 23, 2025

Timex Sinclair 1000 New Case and Keyboard

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     The Timex Sinclair 1000 (ZX81) is a charmingly limited computer from 1982. It has one of the worst keyboards of all time, and it begs f...
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Sunday, November 24, 2024

Synsonics Pro Dual Kit Drum schematic

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    I'm always looking for drum synths to document, and I recently found a "Synsonics  Pro Dual Kit" from Japan. Not to be con...
Sunday, November 3, 2024

Ibanez EM5 and DL5 schematic comparison

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      After redrawing the Ibanez DL5 schematic, I moved on to the EM5 from the same line. The EM5 has become sought after, and commands hund...
Saturday, October 26, 2024

Ibanez DL5 schematic

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           I've been looking at various delays, digital and analog. I came across the Ibanez DL5, from their "Soundtank" line....
Saturday, September 7, 2024

Koogo Analog Delay schematic (Donner Yellow Fall)

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Update : This appears to be a clone of the PT-80 Delay by Scott Swartz  from 2002. The Donner Yellow Fall came out around 2014. In Scott...
Saturday, August 10, 2024

Adding CV to the Electro Harmonix EH400 Mini Synthesizer

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    This is a follow up to our previous look at the EH400 here . Now we're investigating methods of voltage controlling the oscillator. ...
Saturday, August 3, 2024

Atari XC12 FSK Decoder

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      I have a bit of a fascination with tape storage interfaces. They're just an interesting junction between analog and digital. How d...