[sdiy] Help with sawtooth convertor

Tony K weplar at gmail.com
Fri Jan 11 00:15:03 CET 2019

Yes, for n-channel, Vgs=0 (OFF), Vgs=Vp (ON). Pick a low on resistance, high pinch-off N-channel JFET such as a 2N4859. Hal Chamberlain's VCO in M.A.M. drives this with a 100ns -15 V pulse , LM311. 

> On Jan 10, 2019, at 2:41 PM, Tim Ressel <timr at circuitabbey.com> wrote:
> So I would need a negative voltage to turn on a jfet, yes?

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