[sdiy] Pulse 2-Ramp Oscillator

[David G Dixon]

The hardest part is to keep the ramp from drifting up or down to the rails. 

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On 
> Behalf Of Gordonjcp
> Sent: Monday, January 22, 2018 1:09 PM
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] Pulse 2-Ramp Oscillator
> 
> On Mon, Jan 22, 2018 at 03:57:30PM +0000, Rob Spencer wrote:
> > 
> > Does anyone know if such an analogue circuit exists 
> already? I'm guessing it would be some sort of relaxation 
> oscillator which charges a timing cap up to a voltage 
> (amplitude), holds on for a delay, then discharges via a 
> variable resistor.
> 
> You'd need a pair of current sources I reckon, one for the 
> charge and one for the discharge side.
> 
> Don't ask me how you'd control the slope *and* get the two to 
> track exactly ;-)
> 
> --
> Gordonjcp
> 
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