[time-nuts] 4046 replacement

donald collie donaldbcollie at gmail.com
Mon May 7 06:36:50 EDT 2018


Question : In the 74HCT9046BCN - does a high on the inhibit line Knobble
the P/F detectors as well as the VCO?

On Mon, May 7, 2018 at 10:34 PM, donald collie <donaldbcollie at gmail.com>
wrote:

> Thankyou to all who responded to my querie - I`ve got 5  74HCT9046BCN on a
> slow boat from China. They will retrofit the projects where I used a 4046
> without much pcb surgery. PLL`s are fun, especially when yo can watch them
> lock on a Tek 7834   :-) I interloaned the weighty tome again, and am
> having another read - it is "Phase Locked Loops : Design, Simulation, and
> Applications" sixth edition - a good bedtime read!
> Cheers!.....................................................................Don
> C. ZL4GX
>
>
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> On Mon, May 7, 2018 at 6:11 AM, Magnus Danielson <
> magnus at rubidium.dyndns.org> wrote:
>
>> Hi Charles,
>>
>> On 05/06/2018 06:08 PM, Charles Steinmetz wrote:
>> > Magnus wrote:
>> >
>> >> If you use it without care and knowledge, beware. That goes for any
>> >> tool we apply
>> >
>> > Indeed!  The Cardinal Rule of design!  (So often unfollowed....)
>> >
>> > "An engineer is someone who can figure out what questions need to be
>> > asked, figure out how to answer them, and tell when they are correctly
>> > answered."
>>
>> Indeed. I don't claim to be expert on the 4046 family of PLL chips, but
>> at least I can share my experience and let you know about the things I
>> learned from being bitten.
>>
>> Then, reading Gardners book, and advancing to full PI loop, I feel more
>> comfortable about mixer or S/R-gate loops. The "magic" of some detectors
>> have become less of a benefit for many designs. In general, most of my
>> designs have become much simpler and robust. However, it's always good
>> to have alternatives.
>>
>> Cheers,
>> Magnus
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