[sdiy] expo converter

[tomg@efm]

Hi Jim, we are a million miles apart on the tc thing....and right next door
too..;-)
I'm sorry , and I apologize. I didn't realize our product names were so
close...I hope
it doesn't cause you any confusion in the future. There are only a few sbms
left and
I'll stop using that name. There are some other things about your synth that
I also
just realized.... Very nice indeed!

Tom



>     If you want to experiment with an OTA based Tempco, you will find an
example of one
> implementation on my website, and JH had one at one time on his (it was
still there the
> last time I looked).  I used the transistor in the expo converter as that
does the
> constant current reference as the temp sensor.  Works very nicely.  JH
gave me the idea
> of using the diode bias current in the OTA to control the gain.  The
amplifier bias
> current is used to control the scale.
>
>
>     Mine can be found at: http://www.silcom.com/~patchell/smb1/smb.pdf
>
>     -Jim