Archive of the former Yahoo!Groups mailing list: Yamaha CS80

Hello,

Would it be appropriate to replace the +8/-6.5 side of a CS-60 psu with a pair of adjustable regulators? Its a pain finding some of the Japanese parts.
The digital portion of the circuit couldn't be more than a dozen or so CMOS, right? What kind of current requirements would be put on that supply? I've got NTE956/957 on hand so it would be an easy enough fix.
Also, why the seperate COM1 and COM2 on the psu? To keep the digital noise out of the signal ground? Should I get ∗roughly∗ correct reading measuring the +8/-6 rails from COM1? IE is something messed up if there is a big DC offset between the 15/-5 and the 8/-6 supplies?

Best,
Cooper