This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Wednesday, July 22, 2015

Ibanez Dirt Box

Here's a rare one from the 70s by Ibanez. It was originally marketed as the OD-850 Overdrive II (not to be confused with the OD-855). But since the nature of this pedal is more distortion/fuzz territory, it wasn't a great name and it was changed to the Dirt Box. Whatever you want to call it, the circuit is essentially a Distortion +/DOD 250/Ross Distortion with a dual op-amp and a Tube Screamer-like tone control. The 220n capacitor coming off lug 2 of the Tone pot was originally a tantalum cap, but like the Tube Screamer, using a film cap should give better response. The sound is apparently similar to the op-amp version of the old EHX Muff Fuzz (the one that plugged directly into your guitar, not the BMP).

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