2
\$\begingroup\$

Circuit I am trying to mix a mono microphone into both channels of stereo audio. The output of the microphone amp is yellow. The stereo in is red. I am using 2 schottky diodes in order to mix. Is this an imporpor way to mix audio/is there a better way? Also, this device is low power, but I am using a lm386 to amplify the electret microphone. Are there better alternatives or am I doing it right?

\$\endgroup\$
  • \$\begingroup\$ I'm pretty sure this is a duplicate, but maybe not \$\endgroup\$ – Voltage Spike Jul 10 '17 at 16:31
  • \$\begingroup\$ you can't use a diode on AC signals like music. ok, well you can but shouldn't \$\endgroup\$ – dandavis Jul 10 '17 at 19:13
4
\$\begingroup\$

No, using diodes does not accomplish what you want. That will partically rectify the additional signal, making it sound like a mess.

You need to actually mix the new signal onto each of the two stereo signals separately. That might be as simple as a few resistors if the new signal is well buffered so that its impedance is low, and whatever is receiving the mixed signals can handle high input impedance, like a few 100 Ohms.

\$\endgroup\$
-1
\$\begingroup\$

Feed the mono output from the amplified microphone signal to left and right channels with a resistor such as 1 kohm. It can also be as simple as shorting both left and right inputs electrically to the common mono signal but using a resistor is safer.

The lowest power solution would be to not use an amplifier - you may indeed get away with connecting the microphone output to left and right input channels. From your "in" node - connect it to left and right.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.