2-comparator sawtooth generators?

Joachim Verghese jocke at netcontrol.fi
Thu Jul 6 11:41:03 CEST 1995

On Wed, 5 Jul 1995, Rick Jansen wrote:

> (Anyone know what the current limit is for HC4066 switches?)

25 mA

For the same reason, I once experimented with using an IRFD120 FET
as a fast switch. It can easily handle 1A continuously, but since
FETs are inherently capacitive devices, the gate signal edges would
couple into the sawtooth, resulting in large spikes. A series gate
resistance helps a little, but there will still be some ringing.

Personally, I prefer the slow discharge method (1...5 us), using
a standard 4066 controlled by a fixed-time mono-stable, but that's
just my opinion. :)


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