#Sound Effects
25-May-88 20:40:18
Sb: #126481-#Sound Effects
Fm: Richard Rae/SYSOP 76703,4253
To: W. Scott & K. Morton 71625,1162
This message turned up in search, but its forum couldn’t be identified from the original transcript, so it may not be linked into its thread.
FYI, opamps don't "require + and – voltage". This is a question of
perspective. The only restriction is that your zero signal level must be
set such that both the positive and negative peaks of the signal you will
be working with fall within the supply rails. For example, if you're
running from ground and a +15 volt supply, you use two resistors and a
capacitor to establish a 7.5 volt reference and use that to bias the
opamps. Trivial, really.
The other issue is how much voltage you actually need. Again, no problem:
the LM324, for example, can handle the Amiga's bandwidth with no
difficulty, and it will run quite admirably off a single 5 volt logic
supply.