This is a 1 watt per channel using two LM386N. This circuit belongs to kitsrus.com and the kit is available there or at electronickits.com. This circuit only need 10mA current with best voltage supply is 6-12VDC. No heatsink required for normal usage.
There are only a few external components, the IC contains most of the necessary circuitry. C1, C5 are the input coupling capacitors, which block any DC that might be present on the inputs. C2, C9 maintain DC bias levels in the gain adjustment (feed back) circuit. C4 provides power supply decoupling, and C6, C8 are the output coupling capacitors. C10, R1 and C11, R2 act as zobel networks providing a high frequency load to maintain stability where loud speaker inductive reactance may become excessive. The pot provides adjustable input level attenuation.
Components :
Capacitors : C1, C5 2.2 uF / 50Vecap _________2 C2, C9 10 uF / 25V ecap _________2 C3, C7 100 nF mono (104) ________2 C4 100 uF / 16V ecap ____________1 C6, C8 470 uF / 16V ecap ________2 C10, C11 47 nF mylar (473) ______2 Resistors : R1, R2 10 ohm ___________________2 Pot 1 10k ohm stereo pot ________1 Misc. : IC 1, 2 LM386N __________________2 8 pin IC socket _________________2
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