lochbika / lineinmixer

LineInMixer

This is a project for a 2 channel line in audio mixer. In my case, I use it to mix my electric guitar signal with the stereo signal from my phone to a single mono output. Both inputs are buffered and have separate volume controls. The mixed signal goes through a simple output stage with a master volume control.

Features

• 1 stereo input (line in: is converted to mono, e.g. audio coming from a phone)
• lowpass filter for line in
• 1 mono input (e.g. electric guitar)
• both input channels are buffered
• input volume control for each input channel
• mixed audio inputs go through an amplifier output stage
• master volume for output

Files

• TinyCAD files are in the TinyCAD directory.
• VeeCAD files are in the VeeCAD directory.
• LTspice files are in the LTSpice directory.

Schematic

The schematic is drawn by TinyCAD.

Strip board layout

I used VeeCAD to create a stripboard layout.