controlling gain of second amp without connecting wires.

[bob v]

Is there a way that I can use the volume from 1 amp to control the volume of another acoustically? If amp 1 gets louder, amp 2 gets louder, and vice versa, without using permanently connected wires.
I can place a mic in front of the speaker (amp !) to control the other amp.. How can I use the mic output voltage control the gain of the other amp?
Thought of using a Light depentent resistor at the input of amp 2 to control the gain.
thanks fir your help.
Bob Vee

 

[danadak]

Are both amps using same source or do they carry different audio streams ?

You could use an optical approach looking at vol control knobs as one approach.

Or use an agc circuit and modify the source signal amplitude into second amp.

Or use a tone based system that issues vol lev of first amp. couple optically to second amp,
like an IR link, decode the level and adjust vol in second amp.

Quite a few approaches I would think.


Regards, Dana.

 

[ZipZapOuch]

How quickly do you need the second amp to respond to the new volume level? If a knob turn is ok, and 0.5 second is fine, then a wifi interface is possible. One mast volume on a "server" and all downstream devices can check for a new volume setting once or twice per second.

Else, you run into problems of quiet times between sets or when playing quietly vs loudly could cause the gain to change with an AGC concept on the second amplifier.

 

[bob v]

bob v:
Thanks Dana,
i'm using two different sources. one is an analog music instrument (keyboard), the second is a MIDI . would like the analog to conttrol the MIDI. Was thinking (in my limited knowledge): place a mic at the speaker, amplify that then rectify it to get a DC voltage then use that voltage to control an optocoupler at the input of the MIDI amplifier. Can't use footpedals.
.