crazytooguy
Well-known member
- Joined
- Dec 9, 2005
- Messages
- 57
Hello all. I have been working on a G9 based clone (made my own board designs with separate boards for each channel and a few other minor additions) and followed the G9 power supply design closely. I get a good bit of ripple in both the B+ and 12V supplies. The B+ has about 375mV ripple (p-p) and the 12V has about 180mV. Accordingly, I get a lot of 120Hz (and up) buzz at all but the lowest gain settings. If I get my digicam working soon, I'll post some scope photos of the ripple. Grounds are starred through the channel one input XLR case ground connection.
I'm using one 220µF/350V cap each for the B+ C14 and C15. I connected a 100µF cap across the 12V supply, and it didn't reduce the noise very much at all. So, what would you suggest I do to reduce this noise in the power supply lines? More caps, a choke? Would additional filter caps on the channel boards help? Or are the regulators suspect culprits as well? Thanks in advance for the help!!
I'm using one 220µF/350V cap each for the B+ C14 and C15. I connected a 100µF cap across the 12V supply, and it didn't reduce the noise very much at all. So, what would you suggest I do to reduce this noise in the power supply lines? More caps, a choke? Would additional filter caps on the channel boards help? Or are the regulators suspect culprits as well? Thanks in advance for the help!!