Mono/Poly VCO heater (was: beating a dead DAC )

[tomg]

[snip]
> Think of it as a cascaded servo loop. When the chip is too cold,
> the internal heater is activated. But this internal heater is artificially
> starved, and can only draw so much current. As soon as the internal
> heater hits its (reduced) limits, an external "booster" is turned on.

Well isin't that clever!! Those Korg guys are neato huh!.... Do you
know if the resistor is actually in thermal contact with the chip or not?

[snip]
> All right, part of this last one might be speculation. But
> I have a feeling that I've learned a lot today. I think it's a brilliant
> solution, and once more a Korg circuit has caught my highest
> admiration !
> And thanks to Osamu for pointing this out!
>
> JH.

Me too...thanks huge for digging this out. Even if you are just very
close it's still very cool.....er... warm.....;-) Thanks to Osamu too.

-tg