Suboctave generator - 4013?

[Happy Harry]

Hi Colin:

HC inputs have lower gate input capacitance (about 5pf typ.) vs.
4000 series (about 12pf)...

And run on 7V max (vs 18V...)

The RC filter in the feedback may be there to kill false triggering
if the clock is double pulsed.

A cute trick I'll remember myself. Thanks !

H^) harry


>From: "Colin Fraser" <colinf at ntlworld.com>
>To: "'Tony Allgood'" <oakley at techrepairs.freeserve.co.uk>,        "'Synth 
>DIY'" <synth-diy at node12b53.a2000.nl>
>Subject: RE: Suboctave generator - 4013?
>Date: Thu, 18 Jan 2001 22:41:41 -0000
>
> > -----Original Message-----
> > From: owner-synth-diy at node12b53.a2000.nl
> > [mailto:owner-synth-diy at node12b53.a2000.nl]On Behalf Of Tony Allgood
> > Sent: Thursday, January 18, 2001 8:14 PM
> > To: Synth DIY
> > Subject: Re: Suboctave generator - 4013?
> >
> > As a footnote, one customer did suggest to use a 2K2 resistor as the
> > feedback path, not just a simple wire link. This would always create a
> > delay in the feedback path compared to the clock rising edge. I have
> > never tried it to see if it would work.
>
>I'm working on a schematic of a old computer midi interface that uses a
>74HC74 to divide a 1MHz clock signal in half.
>It uses a 220 ohm resistor as the notQ to D feedback path, with a 220p
>capacitor from the D input to earth.
>Maybe that would work on the 4013 too. Not sure how different HC inputs are
>to 4000 CMOS.
>
>Colin f
>

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