4W Bridge Amplifier using LM388

4W Bridge Amplifier Circuit Diagram
Parts List:

R3 = 2.7?
VR1 = 10K? Log. Pot.
TR1 = 470K? Trimmer
IC1-2 = LM388
C1 = 100uF/25V
C2 = 100nF
C3 = 10uF/25V
C4-5 = 22uF/25V
C6 = 47nF

This is the 4W bridge amplifier circuit design based on power IC LM388 as the main component. Currently there are 2 chips of LM388 used since a LM388 only have one channel amplification. A single LM388 will deliver about 1.5W power audio output, while 2 pieces of it used with bridge connection, ten it will deliver up to 4W power audio output.

For 6V supply and 4? loudspeaker, the circuit will deliver 1W audio output.
For 12V supply and 8? loudspeaker, the circuit will deliver 4W audio output.

Download LM388 datasheet for your 4W bridge amplifier reference:
? Download link

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