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

It can be hard to find just the right Eurorack modular case. I’m picky about the power supply and distribution. Most small, powered cases don’t have the kind of power … Read More

This PC board appeared in my mailbox, a gift from Josh Rodriquez. It’s hard to believe that it has been nine years since my Modular Tetrazzi project to put Peter … Read More

I built this nice through-zero VCO from Weston Precision Audio. Features:Thru-Zero Linear Frequency Modulation5 wave shapes: Sine, Triangle, Sawtooth, Square, & PulseExtremely good tuning linearity (<+/-5cents over 10 octaves)Built-in high … Read More

Most who are familiar with the circuit design work of Peter Blasser know about the Rollz. It first appeared as the ROLLZ-5 Drum Machine. The Rollz-5 PC board, designed by … Read More

I’d been eyeing these 4hp single sloths from Nonlinearcircuits for some time, so I sourced two panels and PC boards from Synthcube. The panels are designed by Clarke Robinson. I … Read More

After posting about my old Telequipment D66 scope, I began looking around for a brand new, up-to-date oscilloscope for my DIY work. I decided on this Rigol DS1102Z-E. I chose … Read More

I took apart my old oscilloscope to have a look and clean it up. I had inherited this ‘scope from my father-in-law, and it’s served me quite well for years. … Read More