[sdiy]

[harry bissell]

ahhh... the noise comment was that you have to set the track/hold
JUST before the reset point. A tiny amount of noise will make it
hold at the wrong time. Prlly need a one-shot that will cover the
reset time consistantly

H^) harry

François CHAUVET wrote:
> Harry Bissel wrote:
>
>   
>> Did you make sure the ramp reset is as short as it can be ???
>>     
>
> It probably isn't. But I want to keep it realistic, and a subnanosecond
> reset is unlikely to be so!
>
>   
>> For LFO work... you could use a track/hold to ride out the glitch.
>>     
>
> I'll try that. Filtering even with a single RC cell gives ugly waveforms.
>
>   
>> Simulations show this works well, but imho in the real world noise and
>> amplitude variations in the ramp will fvck you over...
>>     
>
> Noise? I hope not, or not that much. But amplitude variations will
> certainly, because the whole thing relies on the voltage dividers not
> saturating, and the input ramp and symmetry CV never ever exceeding the
> +/-5V range.
> However, simulation is clearly not the ultimate point, it just speeds
> conceptions. For the moment I need €€€ and room to install a decent lab...
>
>
> -- françois
>
>
>