[sdiy] sync circuit woes

Simon Brouwer simon.oo.o at xs4all.nl
Sun Sep 21 20:06:02 CEST 2008


Ian Fritz schreef:
>
>>
>>If the channel resistance of the FET is low enough that a 10 pF would
>> work
>>well, a 22 pf would also work, but it would result in longer reset time
>>than necessary. You want a capacitor which is just big enough (with some
>>margin to account for tolerances).
>
>
> Of course.  But the point is that his circuit didn't oscillate AT ALL with
> 22 pF and it did with 10 pF.

Yes, strange.

Also, he was talking about an 18 pF capacitor around the LM311. I don't
get that, it shows a 22 pF capacitor in the schematic.



-- 
Vriendelijke groet,

Simon Brouwer
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