On Mon, 02 May 2005 13:50:08 -0400, Spehro Pefhany
wrote:
On Mon, 02 May 2005 13:39:42 -0400, the renowned Albre wrote:
Again, thanks Jim.
After I read your first message, I googled with different keywords. As
a result, I did find a schematic which showed a 4584 cmos gate
oscillator with the input (Vcc) varied to control the output
frequency. With an R of 2.2 meg and a C of 220 pf, the author claims
that 2.5v in produces 1 Khz out and 9v in produces 20.8Khz out.
That's a ST hex inverter.
I'd post it, but I think binary attachments are forbidden here.
just post a link, like this one:
http://www.discovercircuits.com/PDF-FILES/4584vco.pdf
Best regards,
Spehro Pefhany
That works because the 4584 has hysteresis. I think an ordinary
inverter will vary only a small amount.
I have made custom chips where the inverters had current mirrors in
the rails.
...Jim Thompson
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