[sdiy] Adding "sync" to a Through-Zero Sinewave Oscillator design

[rsdio at audiobanshee.com]

Right. Although the derivative of the waveform changes sign, the absolute value / voltage does not. Since triangle oscillators are built with integrator circuits, the sign of the charge injection changes, but that is not a signal that is available external to the VCO.

Brian


On Sep 15, 2018, at 4:02 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
> I thought triangle oscillators didn’t change *sign*, but rather changed *direction*.
> 
> Changing sign would imply that a waveform at +2V would jump abruptly to -2V. Changing directions means only that a waveform that has been rising up to +2V would start falling instead.