On Mon, 24 Mar 2008 15:40:53 -0700 (PDT), Artem
wrote:

This is still a strain in language as you have done nothing to
describe what the "compensation" is for. The circuit of your
schematic is fully differential in a bridge configuration, so saying
it will not amplify still makes no sense. To offer a deliberate

It will not amplify signal in-phase signal. It's same like
differential amplifier.

This still makes no sense. You have not described what you are
"compensating" for, and differential amplifiers amplify without
distinction to "in-phase" or "out-of-phase." If it did, you are not
using the right topology because you are using operational amplifier
terminology - the circuit is not an operational amplifier, even by
discrete components.

They are not shown in your schematic. I don't see them in your
photos. Making them operational is adding yet more lines, although I
can see they would be necessary for your purposes.

http://img245.imageshack.us/my.php?image=d3du5.jpg

Nice close-up. Choking of some of the lines seems OK, but not the
coax. So, now where is the schematic of the biasing for these
varicaps? If those two clear insulation lines are going to the loop,
it is going to be hard to apply DC to a dead short - or does that
black shroud cover more than the varicaps?

73's
Richard Clark, KB7QHC