I have a large pre-amp circuit with 4 stages of amplification. The power supply has +24V, +12V, -12V and +5V outputs. The noise from the -12V supply is getting into the final outputs. Why? Is there a problem with one components that uses the -12V in the final output? Is there a problem with one of the AC bypass caps on the -12V line? The power supply isn't the problem. It works fine with the other preamp boards. If you need more info, let me know? Thanks.
2007-03-29 01:22:29 · 1 answers · asked by nipsy3 2 in Science & Mathematics ➔ Engineering
You must be whacking the -12 hard for some reason. Check your decoupling on that supply and make sure you have more than electrolytics on it. They go resitive at a few MHz. Makes sure you have some high frequency (silver mica caps) in parallel with the big electrolytic and make sure the supply can put out the current you're demanding.
2007-03-29 01:31:51 · answer #1 · answered by Gene 7 · 0⤊ 0⤋