DIY LFO, Sampls & Hold, Stepped voltage generator, and Noise

Some old fracrack synth modules. The last is a Blacet Mixer Processor. The others are DIY. These DIY modules are

2 x 8 step sequencers. These are barebones they don’t have any quantization or even LEDs for the steps. These have a clock trigger out, forward backward switch, reset, and a carry out which can be used to chain them together.

A 10 step step sequencer it outputs a trigger at each of 10 steps. This has a clock out, and and end step which can be used to make shorter sequences.

2 x LFOs with triangle, square, saw, noise, and step out. These also have a sample and hold.


This will be the fourth time I try to build one of these. I made a PCB for the original using the layout from GGG. I never finished this. Then I built and finished a second using the layout from I couldn’t get this to work. I forget what the problems were, it was more than a few years ago. Franciso Pena, of came up with a new and improved version that used 13600 in place of the 3080s. I built the first version of this. It was the most successful of the bunch. It worked pretty well but had two problems that I couldn’t seem to solve. With mine you could hear a ticking from the sample rate oscillator and the sweep switch refused to work in one direction.

Anyway, I found a sheet of PnP that I had printed sometime ago of Francisco’s second version of the FSH-1. I thought what the heck, might as well give it another try.

FSH-1 v2

9V Sample and Hold

With a great idea from Brian Marshall of Subdecay I managed to get my 9V sample and Hold working. This ties Brian’s Sample and Hold to the Colorsound Wah. This works pretty good. The range of the effect could still use some adjustment.

9V sample and Hold

9V Sample and Hold

Here’s a sound sample of the 9V Sample & Hold I have been working on. So far things are going pretty well. It’s based on an idea by Brian Marshall and the Color Sound Wah.

9V S&H Test Mp3

Sample & Hold

I have this for Sample and Hold effects. Though I have yet to build a really good one.

Here are a bunch of sketches of S&H ideas that I have been testing.

This is the Maestro FSH-1.

Sample and Hold 2

This uses a 7555 timer for a clock in an attempt to get as short and sharp a clock pulse as possible.

Sample and Hold 3

This is Ray Wilsons Sample and Hold from

Sample and Hold 4

Here’s an idea from the app notes of the 13600. This one worked pretty well.

Sample and Hold 5

This idea came from the forum

Sample and Hold 6