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Hi ,
I got a Creative SBS A390 sub woofer from a friend without satellite speakers.
I have traced the 9 pin Din connector and tried to test with passive satellite speakers from Creative 5,1 system. But the audio level was very low.
I have traced and draw the circuit diagram ( in attachment ) but still could not figure out how to make it work. From the circuit . I think I need to bias the OP Amp input but no idea how.
I used a 4.7 K ohm pull up resistor to bring op amp + input to 1/2 supply voltage of about 6 V , sound level is slightly better but still it's not up to acceptable level.
Hoping someone could advise.
Tin
I got a Creative SBS A390 sub woofer from a friend without satellite speakers.
I have traced the 9 pin Din connector and tried to test with passive satellite speakers from Creative 5,1 system. But the audio level was very low.
I have traced and draw the circuit diagram ( in attachment ) but still could not figure out how to make it work. From the circuit . I think I need to bias the OP Amp input but no idea how.
I used a 4.7 K ohm pull up resistor to bring op amp + input to 1/2 supply voltage of about 6 V , sound level is slightly better but still it's not up to acceptable level.
Hoping someone could advise.
Tin
