[sdiy] small VCO core (was Temperature stable lin-exp convert er with a CA3086 or CA3046)

[Sowa Roman]

Triangle oscillators I know allways have square output. This square usually
controlls slopes of the triangle, so it's a free bonus.
Add keyed inverter made from one opamp, 4 resistors and transistor
and you have beautifull sawtooth.

Roman

__-----Original Message-----
__From: Tim Ressel [mailto:madhun2001 at yahoo.com]
__Sent: Tuesday, May 28, 2002 9:58 AM
__To: jorgen.bergfors at idg.se; Neil Johnson; synth-diy at dropmix.xs4all.nl
__Subject: RE: [sdiy] small VCO core (was Temperature stable 
__lin-exp converter with a CA3086 or CA3046)
__
__
__J.,
__
__How does one convert a triangle to a saw??
__
__--TR
__
__--- jorgen.bergfors at idg.se wrote:
__> 
__> > It would be nice to have a core VCO design. Just
__> an
__> > expo convertor and a sawtoth oscillator.
__> 
__> Why sawtooth? My recent experiments show that it is
__> much easier to shape
__> other waveforms from a triangle core.
__> Also, a triangle VCO doesn't have the problem with
__> the sawtooth reset time.
__> Mine stays in tune to over 20kHz, without any HF
__> compensation whatsoever.
__> 
__> /Jorgen
__> 
__> 
__
__
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