Im trying to make a simple amplifierim using an lm324(which may change I think I might have blown it up) on a 0-12 supplyand with a 460ohm resistor from the input to the - in, and a 10k pot to the the output, + in is gndedI had it working(very crudely) so I figured id add a voltage offset and just have a capacitor after my transistor to get my nice ac to.a 8ohm speakerhowever I put a 10k pot and had the leg go to the input before the 460 ohm resistor and it didn't do anything other than kill the signal at both ends of the pot not biasing as I thoughtI added that last part and know Im not getting even the crude amplification( like I said probably blown being its one am and I think I shorted something somewhere by accident), anyway im giving up on the crude designI know there are tons of op amp circuits on the web but I was wondering what circuits you guys have used and find work well, some reason I've always had bad luck with audo circuits so simplest is betterthanks for listening
If its to power a small speaker maybe the lm386 will do ( you have several options as LM386N-1: 0.25W Audio Amplifier; LM386N-3 0.5W Audio Amplifier and LM386N-4 1W Audio Amplifier for example).Normally, datasheets will have example circuits, and this Amp is a good example of a well known IC with many a circuits out there.
Yeah im gonna need one of those soon, my current homeade supplies aren't keeping up with me,is there a similiar device that would work with 12vdc as the sole supply? Im thinking most likely my project will be powered off a car battery and hopefully be useful (as an amp I can stow in my friends pickuptruck bed for some mobile music outdoors)im not terribly worried about perfect quality so long as it doesn't horribly distort, I was using the 324 as a preamp basically to drive an npn transistor rated for 8a that I found that actually said it was meant for audio
and with a 460ohm resistor from the input to the - in, and a 10k pot to the the output, + in is gndedI had it working(very crudely)
...to a 8ohm speaker
so I figured id add a voltage offset and just have a capacitor after my transistor to get my nice ac......And for audio is it better to get a dual supply somehow and use an according opamp or to use a dc offset until it gets to the output?
how can I use the lm324 for a vu meter?