4440 stereo amplifier assembling part 2 

4440 stereo amplifier assembling part 2
4440 ic board wiring details
preamp power amp details
how to connect bass treble volume control
pen drive board wiring details
usb port wiring details
hifi switch how to work how to use
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#amplifier
#audio
#bass #stereo
#treble
#usb
#bluetooth
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