LM386

Schematic

• 

  Schematic 1

• 

  Schematic 2

Gain	C1	R1	R4
20x, 14x, 10x	-	-	2k, 5k, 10k
20x	-	-
50x	10UF	1.2K
200x	10UF	-

• Amplification is controlled by R2 in schematic 2

1. C1 1~10uF Bypass capacitor
2. C2 10uF Gain 200x. Optional, without 10uf is 20x gain.
3. C3 220uF Output coupling capacitor
4. C4 47nF Boucherot cell
5. C5 100nF Power supply decoupling
6. C6 100uF Power supply decoupling
7. C7 10uF Microphone coupling capacitor
8. MIC Electret microphone
9. R1 10R Boucherot cell
10. R2 1 ~ 10K Microphone load resistor
11. VSS 4 ~ 12V Supply voltage