[sdiy] +/- 9v synth circuits

[Tim Parkhurst]

For some interesting (and low cost) +/-9V synth circuits, you might want to
dig up the schematics for the old PAIA Gnome (my first synth, and I still
have it). The whole thing ran on two 9V batteries, and used the LM3900 op
amp as the heart of most of its circuitry.

Tim (pack rat) Servo
"Imagination is more important than knowledge." - Albert Einstein




> -----Original Message-----
> From: Ryan Guilfoyle [mailto:netroin at yahoo.com]
> Sent: Tuesday, December 02, 2003 10:56 AM
> To: synth-diy at dropmix.xs4all.nl
> 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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