[sdiy] Compensation for triangle amplitude getting bigger at higher frequencies?

Neil Johnson neil.johnson71 at gmail.com
Tue Aug 29 16:27:39 CEST 2023


Maybe try a little Franco comp in the integrator?

Neil

On Tue, 29 Aug 2023 at 14:42, Scott Bernardi via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> I've breadboarded a VCO with an OTA (as switch) - Integrator - Schmitt trigger triangle / square wave generator at its core. I've noticed that at higher frequencies, the amplitude of the triangle wave gets larger. Like the output of the schmitt trigger is delayed in switching.  I'm using parts of a TL074 in the integrator and schmitt trigger.
> Is this because the rise and fall times of the TL074 become a more appreciable part of the waveform time?  TL074 has 13 V/uSec slew rate, which traverses the ~22v in about 1.7uSec, or the +/-5v trigger points in a bit under 1uSec.  Even at a top frequency of 16kHz, that's about 2% of the total period.
> Is there a way to compensate for this?
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