[sdiy] CA3046 VCO

[Magnus Danielson]

Aaron Lanterman wrote:
> On Feb 19, 2010, at 3:11 AM, David G. Dixon wrote:
> 
>>> Is there a reason the CA3046 heated chip VCO designs don't seem very
>>> popular? Would it be because the transistor matching is not so good, or
>>> some problem (currrent draw?) with the heating scheme?
> 
> If someone wanted to really go nuts, I suppose you could use the heater scheme and then *also* use a tempco resistor. ;)

That would help, but seriously, that is not to "really go nuts". I see 
nothing of vacuum flasks, double ovens, low white and flicker noise 
amplifiers, ovenized reference voltage for reference current, amplitude 
stabilization. Not to speak of the relative low-Q of the resonator.

Do you teach the Leeson effect? Check for Enrico Rubiola's work.

You are far from "really go nuts". I have a deeper understanding of what 
it involves than what is healthy. :)

Cheers,
Magnus