On 16-Jan-02 Peter Onion wrote:

> I assume you mean by putting a suitable resistor between the o/p and i/p of
> the
> gate ?  I did think about this, but since I'm using a schmitt trigger
> (because
> I have a spare gate in a 74HC14 that is used for other things) I didn't try
> it
> as I don't think you can bias schmitt trigger gates into a "linear" region,
> but
> I may be wrong.
>
> I'll give it a try tonight and let you know if it works or not.

Well I spent a few hours playing with this idea last night.

It seems that is it impossible to get a 74HC11 inverter into it's linear region
without it oscillating at some high frequency.  I tried all sorts of things to
calm it down, higher and lower feedback resistors, small and large C, ferrite
beads etc etc etc...

In the end I gave up and went back to using the x2 bipolar amp infront of a
schmitt trigger.

Peter

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