on oscillators

[harrybissell at prodigy.net]

The Aries 314 (number correct ???) used this method.
It has a triangle core (CA3080A) and a sync circuit slaving the sawtooth generator (separate cap) BTW is is a very nice VCO and I have never noticed any stability
or amplitude problems with the sawtooth...

There are schems on line (somewhere....)

H^) Harry


 ---- On Feb 22 "Fraser, Colin J" <Colin.Fraser at scottishpower.plc.uk> wrote: 
> > -----Original Message-----
> > From: Tony Allgood [mailto:oakley at techrepairs.freeserve.co.uk]
> > Sent: 21 February 2000 20:01
> > To: synth diy
> > Subject: Re: on oscillators
> > 
> > I used a triangle core for my 
> > latest VC-LFO
> > design, but generating a good quality sawtooth that had no glitches or
> > f/2 modulation is difficult. I think I will go for sawtooth for audio
> > rate VCOs. Simple LFOs can be triangle cores; a single 13700 can
> > generate square, sine and triangle outputs. And the SSM2220 is still
> > available for the pnp pair. And for HFVCOs, the OTA based designs do
> > very well at speeds up to 300KHz.
> 
> Wasn't Juergen Haible building a triangle core vco with a second timing cap
> (with either half the charge current or twice the capacitance) to generate a
> glitch free sawtooth, synced to the start of the tri wave cycle ?
> Juergen ?
> 
> Colin f