[sdiy] saw/ramp from square?

[Magnus Danielson]

Ingo Debus skrev:
> 
> Am 31.12.2008 um 21:13 schrieb Dan Snazelle:
> 
>> i had heard at some point that ELEKTOR magazine used to run lots of 
>> wave shaping articles back in the 70's,
> 
> Yes, Elektor had a square-to-saw converter that worked independent of 
> frequency. I could dig out the schematic if you like.

You could use a feedback loop in combination with a peak-detector such 
that previous cycles saw-peak is sampled and controlling the 
charge-current. This will cause some amplitude modulation but it could 
be reduced to some degree, and as always with peak detectors this would 
be most significant at low frequencies. If the peak lowpass filtering 
was adapted such modulation could be reduced to a minimum.

Such a solution could be made pretty straightforward thought.

I'd love to see what was in the ELEKTOR magazine, so please find the 
time to dig it up.

Cheers,
Magnus