Odp: [sdiy] +/- 9v synth circuits

[Roman]

little late response, but I'd like to add my 0.03 (enter your currency here)

My initial design for modular was +/-9V and that was the high voltage for
supplying opamps, while all important stuff is supplied from +/-5.
My quad VCO and 5-stage VC envelope are done this way.
It was more than enough for VCO, and just right for ADDSR.
I could attenuate slightly the VCF and be ok with 9V even there.
Later I switched to +/-12V but that's different story.
I also have and idea of +/-3V portable modular synth, and I'm sure
it's doable. +/-1.5V is also probably possible but that would be 
a little too far. And I don't think using DC/DC converters in a synth
is good idea, so 4 AA cells are the goal.

If you want 9V, consider using multiple LION rechargeable
batteries. there are nice cheap 3.6V 1000mAh packs out there.
Stack 6 of them and you have +/-11V with much more capacity
than 9V blocks and comparable.

Roman

----- Original Message ----- 
From: Ryan Guilfoyle <netroin at yahoo.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, December 02, 2003 7:56 PM
Subject: [sdiy] +/- 9v synth circuits


> Wondering if anyone can give me some insight on a
> project I'm working on. I'm trying to make a small 9v
> battery powered synth, for open mic nights/use at
> college. It does not need to be very complex or
> expensive, only portable and stable tuning wise. I've
> already got an LFO/AR and some cv processing circuits
> working on +/-9v, the main problem I see is making a
> making a multimode SVF, and a VCO. The synth does not
> need to have more then a 3-4 octave range on the vco's
> ect.. My planned config is 2 pulse/tri vco/2 lfo/ 2
> env/ 3way mixer/MM vcf/lag and S&H/noise and 2 vca's.
> I have a bunch of EFM boards I thought I lost in my
> last move, and it would be very nice if i could get
> them to run on +/-9v.I will be following the bat's
> with voltage reg's. Any pointers tips ect.. would be
> greatly appreciated.
> 
> 
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