[sdiy] 9v modules?

[john mahoney]

Seth,
When Pat Kammerer was looking for a low voltage filter, Ken Stone wrote,
"For 5V operation, check out the wasp filter."

Question is, how to derive 5V from 9V without burning a lot of juice in the
voltage regulator? (That is, I believe that simply running 9V into a 5V
regulator wastes a lot of power.) There's also the question of how much
current the filter itself will use, i.e. how long the battery life will be.
Maybe there is a 9V Wasp filter?

Another alternative: The VCF from Ray Wilson's Sound Lab Mini-Synth
(www.musicfromouterspace.com) runs on a pair of 9V batteries, by design. You
could get his PC Board (or not) and build only the parts of the circuit you
need, if not the whole synth.

It isn't much, but that's all I've got! ;-)
--
john


----- Original Message ----- 
From: "denshi" <denshiblocks at yahoo.com>
>
> i was curious if anyone has schematics/info on 9v
> modules such as the groups of modules that Arp made
> (like the 2600 in seperate enclosures).  i am
> particularly interesed in making a 9v battery powered
> resonant low pass filter, to use with handheld
> instruments.  thanks all!
>
> seth