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

[Paul Perry]

At 06:10 PM 7/01/98 -0500, you wrote:
>At 03:13 PM 1/7/98 +0100, you wrote:

>How many people have actually built an oven to do this? I know about using
>multi-transistor ICs, using 2 for expo conversion and the other 2 for a
>heater/regulator circuit.  Since the charging capacitor will also change
>along with the temperature, wouldn't it be better (though harder) to build
>an oven and stick the expo converter and the charging cap (at a minimum)
>into it?  Or is this too much work for too little gain?
>Has anyone else thought of this or better yet attempted it?

if you look at National Semiconductor app note 299 (from memory) it has a 
transistor array so the heater etc is IN THE ONE CHIP... you can get zero
tempco caps...
Jim Williams has plenty to say about this in the Linear technology app notes 

also the Nat thing is on the net more than once

paul perry melb aust

comperition started on Analog Heaven in response to childish whining abt the
price of synths:

design a synth for less than $50 worth of parts from the DigiKey catalog!!!!
(assume some old f*cked organ keyboard available, and power supply)

entries by snail to 
Paul Perry
frostwave P/L
56 Neill St, Carlton
Victoria, 
Australia 3053

by May 1, 1998

no prize, just the glory & fame (like the Olympics)