Utility Mixer

This Utility Mixer is a "Swiss Army-knife" for mixing modulation sources together and adding an offset voltage, but it can ofcourse be used as an audio-mixer for mixing together oscillators, noise and other sources. The mixer is DC-coupled.
Inputs

There are 4 attenuverter inputs with a gain of +/- 1.0 IN1, IN2 and IN3 is connected to GND and IN4 is connected to the voltage reference if nothing is connected to the input jack.
Outputs

Two output jacks; inverting and non-inverting
Level indicator

The output level is shown on a LED indicator. Levels below 1 dB are shown with a Green light, between 1 and 4 dB is shown with Amber and more than 4 dB is Red. 0 dB = 5.0 Vp-p
Voltage reference

There is a +5.00 VDC Voltage reference connected to IN4.
Supply

+12 VDC @ 29 mA
-12 VDC @ 13 mA
YouTube video