This is the page where I brag about all the cool synth stuff I’ve done. Hopefully it’s useful to ya. I typically hand draw my stripboard layouts in colored pencil and do panel layouts in inkscape. My panels are usually paper (uncoated) with photocopies, watercolors, and/or sharpie.
I’m not an electrical engineer or anything so if you have some suggestions/advice please feel free to email me: email@example.com. Questions are welcome too. Thanks!
This is a 4-output resistive touch controller I developed originally based on this video here.
It works by passing 12V through your finger (you’ll be fine), into some capacitors, dropping the voltage, and buffering it. Pretty simple! As you can see in the pictures I put masking tape behind the touch sensors to keep them from the grounded panel. And the holes were drilled bigger than the threads, again to avoid contact. This is also my first attempt (eventually successful) at etching my own circuit board! The gold knobs are a bit much, but you know, yolo.
This is the dintree 106 step sequencer, built on strip board from a schematic. Andrew (dintree boy) does a great job summing up the module over on his page, so I won’t repeat any of that, but I’d like to share my strategies for a couple neat light mods.
The pots are wired from -5 to +5V with an optional input per step. I used a negative 5V voltage regulator to wire that voltage to one side of the pots, and hooked the pots to the switching side of the optional input jack. Andrew mentions regulating the 4052s’ power voltages to be able to pass a synth signal though them. In my case I dropped all voltages going into the multiplexers (either from the +-5V pots or an input signal) with a voltage divider, then instead of just buffering the outputs I amplified them back up to their original levels.
Once I figured out how the hell to flash a program onto a microcontroller it worked well! Clocked at audio rates it’s a great oscillator. If I were to change one thing it would probably be my layout–it looks intuitively like there’s one output per step, but it’s anything but!
MFOS envelope follower
This is a slightly modified MFOS circuit. It’s all over there (just the U1 bit of the “Envelope Follower Filter”) but I’ll share this schematic just to show what pot values and such worked for me. I love the inverted out to suck the life out of other VCAs…