Operational Amplifier not working? Answered
I'm trying to use the KA324 IC (which consists of four opamps) for amplifying an audio signal.
I've tried almost every schematic from this website: http://sound.westhost.com/dwopa.htm
and also from lots of other websites, but none of them work.
If the output volume is Really low, the sound is pretty good, but very quiet.
When I turn up the volume, the sound is really bad, I almost can't recognise the song I'm playing.
The output volume is also not that really high. If I keep increasing the input voltage, the output stops increasing after a while. It's not really 'loud' at that moment too.
I've connected the IC to 12V DC (between the two middle pins). The + input goes to the ground connection, the - input goes to my POT voltage divider of the input voltage. The output pin goes straight to the speaker.
I also added a 100kOhm resistor between output and - input. Without that resistor, I hear nothing at all but I think that's normal.
I've also tried the three other op-amps from that IC but no luck.
Is this opamp just not ment for audio amplification? or am I doing something wrong?