The compact power amplifier chip LM386 is perfect if the whole scheme powered from the battery.This circuit can be used as an amplifier for portable speakers because of its small and compact.
Here are the parameters of the device:
6 – 12 VDC
Output power 1 W, 8 Ohm
Indicator of the circuit – LED
Small size – only 44 mm x 44 mm
Parts list : R1:2k2 R2 : 1K R3 : 22 C1 : 10uF/50V C2 : 2.2uF/50V C3 : 470uF/25V C4 : 220uF/25V C5, C6 : 0.1uF C7 : 0.22uF D1 : Red LED PR1 : 10K preset U1 : LM358 SW1 : Slide switch
