[sdiy] Powering ICs from a Voltage Divider

[Aaron Lanterman]

On Oct 15, 2009, at 12:00 PM, Justin Owen wrote:

> Jerry,
>
> Out of interest - if you were to use an op amp would you go with a  
> voltage follower or a non-inverting unity gain amp?
>
> I was originally thinking of just using a voltage follower -  but  
> some of the other posts have got me curious.

Buchla uses an op amp to create +6/-6 volts in the 259 timbre generator:

http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2590_3_200.jpg

Note that Buchla circuits are not necessarily particularly "optimized"  
for any particular criteria - you can tell he sort of stuck stuff  
together until he got the effect he wanted.

In the Music Easel, he uses an op amp along with a transistor to make  
the +13.5 V supply:

http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2590_3_200.jpg

- Aaron