[sdiy] crystal bandpass filter / amplifier with CD4049UBC

[Bert Schiettecatte]

actually 1Mhz would work too, it doesn't matter that much

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of René Schmitz
Sent: woensdag 14 mei 2003 18:12
To: music.maker at gte.net
Cc: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] crystal bandpass filter / amplifier with CD4049UBC




Scott Gravenhorst wrote:

>>..I'm not a RF kind of guy, but surely a specifically designed PLL chip
would
>>be better? A 4046 or one of the Philips ones?
>
>
> Unfortunately, the 4046 PLL's VCO is spec'd at a maximum of 1.6 megaHertz.
I
> believe the application was for 10 MHz.  I found no toggle freq. spec for
the
> phase comparators, so it's hard to say if a 4046 can be used with a
subsitute
> VCO.  I think the phase comparators like to have a pretty big input
signal.

74HC4046 can go to 10Mhz and above.

Cheers,
  René

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uzs159 at uni-bonn.de
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