[sdiy] Hi frequency VC clock

[Mike HEQX]

Is this the last communication that anyone sent? Have not seen anything 
else for a couple of days. Starting to worry that I am not getting 
anything from the list at all.


On 6/21/2017 9:18 AM, Steve Lenham wrote:
> On 21/06/2017 12:25, Tom Wiltshire wrote:
>> The reasons are pretty straightforward:
>>
>> 1) Cheap
>> 2) Available
>> 3) VCO to 10+MHz.
>>
>> Find me another chip that fulfils the above criteria and I'll use it! ;)
>
> 74LS624/628/629?
>
> Venerable but still in production, which perhaps says something.
> Cheap-ish (though not as cheap as a 4046).
> Good for 25MHz if you want but can go low too.
> Still intended as PLL VCOs (so linear) but the OP wanted something to 
> act as a sweepable clock generator, not an expo VCO. A device from 
> this family (74S124, also still available but loves current) is used 
> for that very purpose in the original Lexicon Prime Time delay, with 
> triangle wave modulation.
>
> Cheers,
>
> Steve L.
> Benden Sound Technology
>
>
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