This one’s a really simple implementation of Doepfer’s CV Mixer with offset function. I added an attenuverter section at each input to let me invert the signal befre mixing.
It’s got a total of 5 channels. The first of which is normalled to +12V (can be used as negative through the attenuverter).
The PCB is SMT-based, which is how I was able to cram everything into a 4HP footprint.
Watch my demos of this on my Youtube channel!
Part 1 - Early prototype
Part 2 - First iteration of the PCB
PCB shops use Gerber files for etching copper traces, printing labels, drilling holes, and other manufacturing steps. You can download my zipped Gerber files for a version you like and upload those into their website.
Make sure to print both boards!
v0.3 - LED Fix 2 (Unverified)
This should fix the opamp setup from the previous version.
|Gerber Files||MiniAttenuMix v0.3 - Main.zip|
|MiniAttenuMix v0.3 - Front.zip|
v0.2 - LED Fix (DOES NOT WORK!)
Does not work. This was my first attempt at fixing the LED problem. Made a mistake at the OpAmp section for the LED.
|Gerber Files||MiniAttenuMix v0.2 - Main.zip|
|MiniAttenuMix v0.2 - Front.zip|
v0.1 - Initial version (DOES NOT WORK!)
You can print this version but the LED won’t work unless you replace R19 with a 4.7k resistor from the LED’s Anode (+) to Pin 1 of U3.
|Gerber Files||MiniAttenuMix v0.1 - Main.zip|
|MiniAttenuMix v0.1 - Front.zip|
I’ll have to get v0.3 printed before I can confirm that it works, but you can print in at your own risk!
Follow my Instagram @benjiaomodular for updates.