In previous experiments I've made circuits to transfer sound from electret microphone to a powered speaker. Now I'm doing my first experience with an Op-Amp to make the sound louder and to be able to hear it in a headphone. The Op-Amp I'm using is LM358N. Here is my circuit:
I'm using the formula below, that I copied from the Internet for the non-inverting operation amplifier:
$$Gain = 1 + \frac{R2}{R1}$$
Given the resistor values of R1= 4.7 ohm , R2 = 150 ohm, my gain is about 32.9 times.
So here is the summary of information about my circuit:
- V+ = 5v from USB
- Capacitor : 0.1uF
- R next to V+ : 4.7 Kohm
- R1= 4.7 ohm
- R2 = 150 ohm
But my speaker doesn't work when the op-amp IC is placed on the circuit. If the op-amp IC is inserted on it's socket, I can hear only "rett, rett" when I try to blow to the electret microphone. What is wrong here?
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