How to make a direct microphone to speaker circuit?
Hello all,
I recently wanted to develop a circuit which picks up voice signals from a microphone and outputs it to a speaker.
As I recently started learning to build circuits, I was hoping to get a few inputs and tutorials on how to build one in a step by step manner.
Please help by giving instructions and not a circuit diagram as I am still learning.
Thanks for all your help!
Regards,
Microtest
Discussions
4 years ago
You can see physically how this circuit is put together.
The author called it a radio receiver BUT he put the wrong picture on the page.
Clearly it is a fixed volume three transistor audio amplifier.
I back traced it and guessed at the capacitor values and the transistor type.
It may need adjusting but should work with an electret mic
If yours is a three wire mic let me know and I can change the input.
The reason I like this pic is it zooms so well for a neweby to see the wire placement....
Answer 2 years ago
Would this work using an 8ohm speaker?
Answer 2 years ago
Not as well with a puny TO-92 case 2N3904 driver transistor...
4 years ago
You can use a speaker to an identical speaker just straight wiring, NO electronics, No batteries !
Talk into one and hear it in the other in another room.....
BTW this set up is by-directional ..... Works either way and because there is no amplifier in the path there is no feedback Squeal .. Ever.....
Answer 4 years ago
You can use 2 paper coffee cups connected with a length of string as well, but it isn't going to work very well unless it is a straite line.
However the speaker to speaker works because the output of a speaker is much larger then the output of a microphone.
Answer 4 years ago
I was wondering who would pull that line out :-)
Answer 4 years ago
never one to fail you :-)
Answer 4 years ago
Some details of speaker operation.
The reason the receiving speaker is quieter is the resistance in the connecting wires .... So use heavier gauge wire.
4 years ago
No - You can't directly drive a speaker from a microphone. the output from the microphone has to be amplified by an electronic circuit. Lots of audio amplifiers on line if you search.