[sdiy] just for beginners

[>>>marjan<<<]

Hi,

This is one funky drawn schematic...  ;)
OK, one opamp osc plus simple filter (inegrator). Somewhere in 
there should be charging cap in osc from where you can take
triangle. Cap between osc out and next amp in would eliminate
dc offset. Put some 10-100uF cap across V/2 and gnd, and some
10-100nF ceramic across the rails. Varible resistor in filter
would change the timbre. 
Misusing nulling inputs is nice, I've tried it on 071, inspired
with some stompbox.
You should use real gnd from battery for output. No transformers 
needed.
Having switchable caps in osc can expand it's range.
I'm not exactly sure what side notes and cap nodes say...
Why do you need that 330K in parallel to pot? And pot is
somewhat strangly connected to filter out, what's that
sorta selfmodulation. I doubt osc will work having pot
connected this way.

cheers,


marjan
> i put together a lil' box that runs off a 9v battery with a few cheap
> parts pulse oscillators.. nothing sophisticated, just a few switches,
> buttons and some knobs to twist. thing just makes pulses, noise, and in
> between. not useful perhaps for more than robot noises or power rangers
> engine noises, but these it does well. it SCREAMS!!!!
> 
> 100% beginners only.. fun results for noiseheads.. hoping the links
> work..
> 
> http://www.dancetech.com/aa_dt_new/forums/thread.cfm?threadid=24987&messages=27&chatter_id=1&age=7
> http://www.dancetech.com/aa_dt_new/forums/attatchments/generatorbox.jpg