Tiny ovens

[John Speth]

At 09:05 PM 4/29/97 +0100, you wrote:
>         No need to get so complicated :) why not use some of the
>trannies in the array itself? they are all very closely matched and in
>very close thermal contact (being on the same die). Moog used this on
>their Prodigy synth using CA3046's. These are 5-transistor npn arrays
>with 2 being internally connected as a differential pair, and two used
>as heater and regulator (One is left unused).

Doesn't Rick Jansen's rendition of the Moog VCF use this 3046 heater
topology?  I'm no circuit whiz but it has an isolated circuit labelled
"heater" and it uses a 3046 array.  I found this schematic on the Web
somewhere.

John Speth (johns at oei.com)
Object Engineering, Inc.
Vancouver, WA