A very simple, but useful PCB. A power supply for the Muffsy Relay Input Selector (or anything else that can be powered by 5V DC/1A):

13.05.19 10:17 PM - Comment(s)

While there are lots of quality kits for preamplifiers, I have never really found a decent way of adding more inputs to a preamp. The existing ones are either of dubious quality, spec'ed like a spaceship, or both.


So I decided to make my own input selector. With relays. And an ESP-32 module! A year,...

02.05.19 10:18 AM - Comment(s)

Several people have been in touch lately with questions on how to modify the PCB into something it isn't right now. Popular requests are balanced inputs and/or balanced outputs, and DC servo on the outputs.

16.10.18 03:08 PM - Comment(s)

I just got a request from someone who wants to CNC a front panel for his Muffsy MC Head Amp, and he wanted to use the logo and the font that are on the printed circuit boards.

OSIFONT - The CAD Font

The font used on the PCB is the built-in vector font in Eagle, which is proprietary. The Eagle font is ...

16.07.18 02:23 PM - Comment(s)