[sdiy] low cost ic oscilator question

[eq927 at freenet.carleton.ca]

Hi Peter,
I think the PE-1000 used a simple trimpot-tuned thyristor 
(N13T?) oscillator for each key. You might be able to use a quad or hex 
Schmitt trigger CMOS chip but syncing between oscillators on the same 
chip might occur. My inclination would be to use a separate CMOS 555 
timer (TLC555 or LMC555 or TS555) for each key - the temperature 
stability is good and you might be able to use pin 5 for a "global tune" 
function. Dual CMOS TLC556  might work, but again you will have to make 
sure that osc syncing doesn't occur.
Regards, Mike