[sdiy] TZ triangle core

[Ian Fritz]

At 04:03 PM 3/2/2011, Veronica Merryfield wrote:
>As long as you have one comparator set to "greater than" and the other to 
>"less than" you will catch the normal excursions plus any out of bound 
>startup conditions. And one could use an SR flip flop.

No. This is a TZ FM VCO.

We've just shown that an SR flipflop doesn't work. With TZ FM, the signal 
can hit the top rail (S) then on the way down turn around and hit the top 
rail again.  But the second hit won't do anything, because the flipflop is 
already set. IOW it never gets reset if the input modulating signal has a 
sign reversal.  This is exactly what Harry saw in his simulations.  The 
signal can easily go to the rail when the modulation signal goes through zero.

Ian