[sdiy] Discrete OTA

[David G Dixon]

> I tried a number of active compensation schemes, including 
> several not listed here, but never found anything good 
> enough.  That's why I developed the dial-a-tempco, which is a 
> pain to set up, but which has been working perfectly for many 
> years now.
> http://home.comcast.net/~ijfritz/sy_cir9.htm

...and it's brilliant.  However, it doesn't really translate into trying to
get several hundred calibrated units out the door at a profit.  When you're
paying someone by the hour to calibrate VCOs, then you definitely start
caring a lot less about chasing that next decimal point of accuracy.