[sdiy] 909 PSU modded?

[media at mail1.nai.net]

At 11:09 PM +0100 03/11/01, Synthusiast wrote:
>
>Still I have my doubts about the voltage regulators, especially after
>reading some bad stories about them in the archive.

While more complicated circuits based on the 723 and other designs often
have better specs, three-terminal regulators are _very_ popular and seem to
work fine in a great multitude of applications.

>Can anybody with a 909 schematic confirm that Roland used 7815/7915/7805
>voltage regulators for this machine? And if not, should I replace them
>with other, better ones?

I am looking at an original printing of the JUN. 15, 1984 TR-909 Service
Notes.  Page 12 shows a 7815, 7915, and 7805 on the power supply board.  If
they seem to be working, I see no reason to replace them.