[sdiy] Hi frequency VC clock

[mark verbos]

I’m using a Texas Instruments one. It’s SO16. I hope I can make these work, because I bought a full reel of them!
Which brand are the “good ones”?

Mark


> On Jun 21, 2017, at 12:53 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
> 
> 
> 
> On 20 Jun 2017, at 23:09, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> 
>> Hi,
>> 
>> mark verbos wrote:
>>> 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…
>> 
>> Which manufacturer are you using?
> 
> Unfortunately this is an extremely pertinent question. When I looked into something similar, I bought three or four different types because I'd heard they were different and so it proved. Different to the extent that I couldn't use the same components values with different manufacturer's chips. Each "4046" is essentially its own device, despite having the same part number.
> 
> Tom