New EFM

[tomg]

What's New
http://www.xavax.com/efm/new-efm.html
Upload history file - I tried this before, maybe this time I'll keep it up to date.

PUT VCO
http://www.xavax.com/efm/pdf/put-vco1.pdf 
Interesting but almost useless VCO. Interesting because it uses a Programmable 
Uni-junction Transistor. Almost useless because it has a limited 30Hz to 2.5KHz 
range and goes flat after 3 1/2 octaves. If you wanted to build a two octave "toy" 
synth this might be ok....I based this on my first successful VCO (the VCO-1) and 
I am fairly disappointed with the results. The VCO-1 has a 2Hz to 20KHz range 
and is good for 5 octaves. Unfortunately it uses a now rare and expensive 2N4853 
Uni-junction transistor. I tried several expo approaches. I was able to get 4 1/2 
octaves before it went flat but unable to do anything about the range. Maybe someone 
else can find a way to extend the range or use it as a non-musical vco of some sort.

Mad Mouse 2 (3r) - Concept Drawing
http://www.xavax.com/efm/pcb/mm2-3r.pdf  A patchable Mad Mouse 2.