ATTENUVERTER

Schematic and more information: Kassutronics

This module is an attenuator and an inverter at the same time and also a mixer with an additional input.

It works as an attenuator when the potentiometer is from center to right (fully clockwise) and when you rotate the potentiometer counter clockwise from center, it starts inverting the signal.

STRIPBOARD LAYOUT

I used +5v from PSU, so the offset function might be unstable.

If your PSU doesn't have +5v or you are worried about it, you would build it with LM4040. In the near future, I'd also build another one with LM4040 and compare both and see the difference.

And the potentiometers I used are center-detented, which is so convenient to know where 0v is.

As always I soldered 100nF decoupling capacitors underneath the boards so you can't see them on the stripboard layout. So please don't forget soldering decoupling capacitors when you build this module.

FACEPLATE LAYOUT

The dimension is 40mm x 129mm. 

This layout is actual size so you can use it as a drilling template.

• 3.5mm jack hole : 6mm
• Potentiometer hole : 7mm
• Screw hole : 3mm