Well, for your collector current sampler, you could do something like this:

1. Put a resistor from the output of an op amp to the inverting input, say
1k.
2. Drive the non-inverting input with the desired collector voltage, say
+10V.
3. Connect the collector of the transistor to the non-inverting input of
the op amp.
4. Ideally, the inverting input is at the same voltage as the
non-inverting voltage, so it's at 10V. Ideally no current flows into
either input of the op-amp, so all the collector current must flow through
the resistor. The output voltage will then be 10V + Ic*1k. You can measure
that output voltage and calculate the collector current.

Harold



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