What is wrong with this preamp circuit

208

04:33:08

I have been reading all sorts of science papers, articles and watched many YouTube videos, this is the most common circuit, but I will be damned if it works for me. The idea is that I will amplify the signal of an electret mic to output to a speaker(intercom setup). But..as you can see the circuit isn't amplifying.

I've chosen 4.7kOhm for collector and 100 Ohm for emitter so their ratio gives me 47 gain.

published 8 years ago

yra

8 years ago

If you want to change your 4.7 too a 100 ohm resistance you can see a near 5ma gain. Input resistance matters

dikidera

8 years ago

I seem to have made it work, but that 100ohm resistor gets very very hot, I burned myself twice on it. And I need to use this circuit in a real-world situation.

wyoelk

8 years ago

For your needs you will probably have to use a small Amplifier also. Search for "Preamplifiers" then "Power Amplifiers" a year ago by thebugger. He defines the use of each and gives circuits to build from.

ramaachyuth

8 years ago

Bro simply decrease r1(1.5k) its working

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