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.
- 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
- TinyCAD files are in the TinyCAD directory.
- VeeCAD files are in the VeeCAD directory.
- LTspice files are in the LTSpice directory.
The schematic is drawn by TinyCAD.
I used VeeCAD to create a stripboard layout.