Thanks Rob,

The current needed to pull the frequency appears to be very small, which 
means I don't waste much power feeding the R(set) input.

My next best choice was a low power 555 timer, at around 70 microamps, so 
the LT part looks good!

A cmos gate oscillator (4000 series) might draw less power, but I haven't 
figured out how to vary the frequency with a voltage input yet.

Regards,

Art


At 11:13 AM 5/2/2005, you wrote:


>>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.
>>
>>Any suggestions?
>>
>>Thanks,
>>
>>Art
>
>
>
>
>LTC6906 from Linear Technology?  Rset picked as fixed value and instead of 
>grounding one end, use your control voltage (or probably some buffered and 
>scaled version).
>
>Rob Young
>
>
>
>
>
>>
>>
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