My father gave me these old amp with one problem. R channel normal, but L channel sound very low and noisy. After some checking procedure i've found L output of STK2038 shows high negative voltage, R output did not. Because these ic replacement very rare, I decide to modif it with another STK series. Did anyone knows the pin configuration of these STK2038 ? Any schematics will helpfull.
Look on this here web...
for schematics of possible substitutes. In the meantime, if you want to fool around with what you've got, I'd put a large electrolytic cap in the output of the channel you have the problem with. That would protect the speaker from the DC.
for schematics of possible substitutes. In the meantime, if you want to fool around with what you've got, I'd put a large electrolytic cap in the output of the channel you have the problem with. That would protect the speaker from the DC.
STK2038 datasheet and Application Note, Data Sheet, Circuit, PDF, Pinout | Datasheet Archive , not the most clear datasheet I've seen ( for one it's in Japanese ) but you can get some useful information from the schematic inside.
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