[sdiy] Powering ICs from a Voltage Divider

[Jerry Gray-Eskue]

The old standby, Op Amps and Linear Integrated Circuits - Coughlin/Driscoll,
in chapter 14-6 covers some Op Amp regulators including current boost
transistors. It is interesting to note that they tend to use Inverting Op
Amps instead of a voltage divider / Voltage Follower combination.

- Jerry


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Aaron Lanterman
Sent: Thursday, October 15, 2009 1:07 PM
To: synthdiy DIY
Subject: Re: [sdiy] Powering ICs from a Voltage Divider



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

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