This Low voltage bridge audio amplifier circuit is for low voltage applications requiring high power outputs. Output power levels of 1.0 W into 4 ohm from 6 V-and 3.5 W into 8 ohm from 12 V are typical. Coupling capacitors are not necessary since the output dc levels will-be within a few tenths of a volt of each other. Where critical matching is required the 500 K potentiometer is added and adjusted for zero dc current flow through the load.
Parts list :
R1, R2, R3, R4 : 270 ohm
R5 : 2,7 ohm
VR1 : 10K
VR2 : 500K Variable
C1, C2 : 20uF
C3 : 0.05uF
C4 : 0.1uF
IC1, IC2 : LM386
Note :
Vs = 8V RL = 4 ohm Po = 1 W
Vs = 12V RL = 8 ohm Po = 3,5 W
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