thru zero VCO schematic

[Rene Schmitz]

At 11:32 11.09.99 +0200, you wrote:
>Rene Schmitz wrote:
>> 
>> I took the time to draw a little diagramm, so that we
>> all know what we're talking about.
>
>Aaaahh! Now things are getting clearer. :-)
>
>Couldn't a 555 be used instead of the LM393 and 4013? This would be a RS
>flipflop instead of a toggle flipflop. Sorry if this had been discussed
>before, but I didn't understand very much before I saw the schematic
>#-).

No, 555 doesn't do, I need the toggle of the FF occur independantly, in
this circuit it can happen that the upper threshold is crossed two times
without getting to the lower threshold in the meantime, the 555 wouldn't
toggle then. 

Bye
 René


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