[sdiy] Adding Tap Tempo to an LFO

[drheqx]

Thanks Don,
After blocking out what would be the digital equivalent to this I
realized that the part count may be a lot higher in the digital domain (
for an all hardware solution ). So the hybrid looks good. I'll have to
get some basic building blocks set up on my breadboard.




Don Tillman wrote:

>Use a linear ramp to measure the time between taps.  Some logic starts
>the ramp at the first tap and S/H's the ramp voltage and resets it on
>subsequent taps.  So this delivers a linear voltage proportional to
>the time between taps; perhaps 1V/sec.

>Take the VCO's 2-transistor-and-opamp exponential converter and modify
>it to perform a reciprical function.  (I guess you wouldn't want
>exponential voltage control and tap control at the same time,
>interracting.)  An inverting opamp and first transistor convert the
>tap time voltage into a negative log voltage, and the second
>transistor turns that into the VCO tuning current.





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