Of course it works. S. above!Circuit don`t work as amplifier ................
It arrives via the yellow wire (Mic +). The load resistor (a few kΩ) resides inside the amplifier. This is standard for electret mic. amplifiers.I can not see mic amp power supply
It's just a feedback resistor to establish the base bias voltage. Admittedly it seems rather low. Perhaps 47 or 470 kΩ ?Bias resistor R1 has very small value
I would like to have a little bit of feedback from the mic to the speaker.
A terrible noise. This means feedback from the speaker to the mic, which would create the same terrible sound as if you would hold the mic rather close to the speaker.What would happen if I put a resistor from the mic output (yellow) to the Speaker + (Green)?
Yes. the other side of the amp from my drawing is the same. We each have a headset with mic. (this is actually a com system for a Rally car. We are trying to sort out a headset issue. The other side of the amp, my driver uses a headset with a Electret mic)If I understand your system correctly, I believe you have a separate 2-way communication system:
This is correct1. From your mic + amplifier system (shown above by you) to a speaker, which you can't hear. 2. Some external input (directly, or from a second remote mic.) via a headset amplifier (or directly) to your headset.
Pls. correct me, if I'm wrong!
In this case, you'd need a connection between the output of your mic. amplifier = input of your speaker, and the input of either your headset amplifier or -- directly -- of your headset loudspeakers.
Without schematics of both (2-way) amplifiers inputs/outputs wiring I can't help you further, sorry.
I'm quite sure, however, that it can be realized with a simple addition of a passive device (resistor and/or capacitor) to the existing wiring.
I am limited for the # of wires in and out of my pre-amp. The amp I am connecting to uses 3 wires (shares the neg of the Mic and speaker)
Now when i saw picture of this amp.
it barely dont help because wire A to B is 1cm long
I suppose that from connector to headset mic and speaker has 4 wires
That case its possible that this feedback is acoustical via mechanical
construction.
You can test it by replacing headset speaker(s) with same size resistor ( same ohms ) ( check with ohm meter )
And test by listening is there anymore oscillations in other headset.
If interference is gone.
Try first change speaker phase (interchange speaker side wires + and - )
If it dont help try insulate acoustic waves and vibrations from speaker
to mic
KAK
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