I was gifted the above PC board, which is a Fyrall by Ciat-Lonbarde (Peter Blasser). While awaiting the panel for my Dual Benjolin project (previous post), I dug into the … Read More

I was gifted a pair of Benjolin PC boards by Alan Rosetti. The Benjolin was originally designed by the late Rob Hordijk. There’s a good article about it on Perfect … Read More

I have been assembling a rack for noise improvisation, in the wood case that Kri Samadhi helped me build. Here’s the Modular Grid view. The blank panel on the right … Read More

In a previous post about the Test Bench Rack I received helpful comments from John Loffink, who had also refurbished the same Pittsburgh Modular power supply board. He educated me … Read More

This box contains one HBB15-1.5A power supply. I recapped the supply (replaced all the electrolytic capacitors), as I had done for the MOTM cabinets. The caps on the MOTM-900 were … Read More

I’ve built a Tetrazzi quad oscillator, a Quantussy quintuple modulator, a Roolz 5-6 dual LFO, and am about to built a Dubernator dual VCF. All of these from PC boards … Read More

I had not planned another case so soon, but I had bought a 4ms Row Power 35 supply, thinking that my Row Power 30 was broken. Not broken, just the … Read More

Features Four oscillators with independent controls and outputs Saw, Triangle, Ramp variable shape output Pulse output with variable width Rise rate pot and CV input Fall rate pot and CV … Read More

I noticed a discrepancy of resistor values on the Large Tetrazzi silkscreen and graphic at the spots where the Upton/Donton and Upmod/Dnmod controls attach. All of these come through a … Read More

I built up a part of the Tetrazzi circuit for test purposes. Only the core VCO part were installed, around the 4051 switch and the TL082 op amp, plus the … Read More