Re: differential amp

It is workable, but requires that the 4 divider resistors
drift the same way. If you use a pair of transistors in
common base configuration (emitters to the current sense
resistor), you can cut down on this requirement and get some
voltage gain out of the voltage translation.

I'm trying to picture the circuit from your description. Does it look
like

I-->-+------Rs------+---->
| |
\e e/
pnp |----------| pnp
/c c\
| |
| |
100k 100k
| |
| |
+--, ,--+
| | | |
| | | |
| 100k 100k|
| | | |
| | | |
| | 10k | |
| '-/\/\/\-' |
| ^ |
| | | ,-------,
| | | | U1A | ,-10k--,
| gnd | '-|-\ | | |
| | | >--+--1k--+-|-\ |
'----------|+\ '---|+/ | >-+--out
U1B | >--+-----1k----+----|+/
,-|-/ | | U1C
| | 10k
'-------' |
gnd

.

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