[sdiy] sawtooth phase shifter

[harrybissell]

My project for the week is a sawtooth phase shifter...
more like a waveform animator.  It has three stages,
each driven from a Schmitz (tm) three phase VCO.

It sums the shifted sawtooths, the pulses that form them.
You can pan between pulse and saw.

I'm driving it from the "muffy" guitar synthesizer.  It has
sawtooth outputs at F and 1/2 F ~or~ 2F.

Sounds... how can I put this delicately ... underwhelming.
Like the 'hex fuzz' the more stages you sum, the more
subtle the effect.

One neat thing... If you enable both F and 1/2F ~or~
F and 2F at the same time (now there is a sum going into
the phase shifter)... you get a pronounced "fifth" sound.
This is extremely cool... as this is generated from the
direct 'waves' output of the guitar synth (so there is no
VCO involved ie, no delay... and you get a tracking fifth).

I have yet to re-simulate this and see where the fifth is
comming from.

One possible enhancement I'm thinking of is to make
a sawtooth wave at 1/2F, F, and 2F simultaneously...then
shift each one separatly. If you use a single wave, the
phase shift should approximate FM (vibrato).  With multiple
waves... I have no idea.  I sure hope its more 'whelming'.

Oh yeah, fixed my scope too (again).  ;^P

H^) harry