How about a PIC based Huff & Puff stabilized VFO that could also display the
frequency?
Arv K7HKL
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On Sunday 10 July 2005 09:18 am, Jim Strohm wrote:
On Jul 10, 2005, at 7:04 AM, Ashhar Farhan wrote:
> while PLL chips are difficult to find, the 16F84 or the 16F628 are
> plentiful. why can't we program the PIC to behave as a? PLL on it's?
> own?
>
> the PIC timer can be used to accurately measure the oscillator?
> frequency
> (as normal PIC based frequency counters do) instead of displaying the
> frequency on a display, it can (in addition) also pump a capacitor?
> that
> in turn is used to bias a varactor across the VFO.
>
> if chris and his merry band can do a single chip HnP, there is no?
> need to
> assume that they can't turn out a single mirochip PLL too.
Given how cheap a PIC is, I think it's just a matter of time before?
we stop using standard TTL/CMOS logic, and start programming PICs as?
replacements.? They won't be pin-for-pin replacements, but they'll be?
easier to locate than some of the more esoteric logic chips.
A PIC PLL sounds like a fabulous project.
Jim N6OTQ
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