Pre-am Mic with LM358

Use Ic LM358 as main component in mic amplifier the best choice, because the noise level in silence increases linearly with gain adn high gain too. The LM358 is a great, easy-to-use dual-channel opamp. 

Feature of LM358

• Large dc voltage gain: 100 dB
• Wide bandwidth (unity gain): 1 MHz (temperature compensated)
• Wide power supply range:
  • single supply: 3V to 32V
  • dual supplies: ±1.5V to ±16V
• Very low supply current drain (500 μA)—essentially independent of supply voltage
• Low input offset voltage: 2 mV

 Mic Amplifier with LM358

 

Componenet :

C1     10uF    
C2     100nF    
C3     220uF    
MIC        Mic condensor
R1     1 ~ 10K    
R2, R3     10K    
R4     1K     Gain = – R5 / R4
R5     100K    
Vcc     3 ~ 30V Dc