On May 2, 2005 02:45 pm, Peter wrote:
> On Mon, 2 May 2005, KY1K wrote:
> > Date: Mon, 02 May 2005 10:37:43 -0400
> > From: KY1K <ky1k@pivot.net>
> > Reply-To: Microcontroller discussion list - Public.
> > <piclist@mit.edu> To: Microcontroller discussion list - Public.
> > <piclist@mit.edu> Subject: [OT] Micropower vco needed
> >
> > I need a low frequency vco that draws very little power. I googled
> > and found tons of uhf and higher vco's, but they all draw much more
> > power than I can supply.
> >
> > I need something that will oscillate between 55 and 65 Khz. It has
> > to draw microamps of supply current, and I prefer the control
> > voltage range to be between 1 and 3 volts.
> >
> > I'd like to have a chip solution if possible.
>
> CMOS4046 PLL (74C4046 etc)

At micoamps worth of current, why not use a 16f5x or 12f5x running in RC 
mode, then use a varactor as your C.
Something like this:
				Vcc
				|
				Z
		large R		|
Cntrl Voltage>--+--WWW--+---|(--+--PIC RC
		|	|
	large	_	_varactor
	cap.	^	^
		|	|
		gnd	gnd
>
> Peter
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