[sdiy] Hi frequency VC clock

[Tim Ressel]

Hi,

According the TI spec sheet the range for the VCOin pin is 1.1 volts to 
about 4 volts depending on the supply.

The Thomas Henry 4046 VCO design (X-4046) ran a current source from an 
expo converter into pin 11 (R1) and tied the VCOin pin to +V. You might 
try that.

--timbo


On 6/20/2017 1:09 PM, mark verbos wrote:
> hi all,
>
> I’m making a new digital delay using some adaptive Delta type 1 bit techniques. I’d like a clock that can be swept from 250kHz to 3MHz without any glitches.
> I’m using a 74HC4046 and it is almost right, but it freaks out when the CV gets near zero and jumps down to a lower frequency. Is this normal? What am I doing wrong?
> I have a 220p cap and a 10k on pin 11 and a 100k on pin 12.
>
> Thanks for any insights…
>
> Mark
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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com