Tempcos was: Re: New(?) ideas for the new year

[Paul Perry]

At 08:17 AM 8/01/98 +0100, Martin Czech  wrote:
  Using a transistor
>array like CA4046 with build in heater transistor is a good idea, but
>they seem to have poor matching, poor Hfe, poor Re, so they are not
>suitable for large range exponential converters as stand alone
>solution.

......well, according to Linear Technology app note 14, page 14, their
exponential v to f convertor ckt has "exponential conformity within 0.13% over
a 10Hz-20KHz range, drift 150ppm".
This has a CA3096AE array.... Jim Williams assured me that if you use the 
components specified in the ckt it will meet these specs.... it is 
specifically designed for musical applications...

A friend who built it was happy, but he didn't have equipment to test the 
stability to these limits


paul perry melbourne australia