I have two audio signals and I want to fade in one signal in just as the other signal fades out and repeat the process backwards and so on… I want to control the circuit using some digital means or voltage control, however the actual circuit should be analog.
Any suggestion for an affordable solution?
Electronic – Digitally controlled audio fader circuit
audiomixer
Best Answer
Or you can use digital pot chips like
AD5242
series dual I2C digital pots, coupled with some op amps.Here is a reference design for you:
simulate this circuit – Schematic created using CircuitLab
The two pots there is the digital pot chip
AD5242BRUZ10
commanded by the Arduino. You can program the Arduino to handle MIDI interface and plug this into your professional audio system rack.OPA4134
is a proper audio grade op amp but it is expensive. You can experiment with orders of magnitude cheaper but pin compatibleLM324
, or get rid of the two voltage followers and use the cheaperOPA134
audio op amp that is pin compatible with741
.TL431
is a 2.5V reference chip used as a virtual ground here.