Question on function of Op Amp

Discussion in 'Homework Help' started by wizq402, Apr 26, 2010.

  1. wizq402

    Thread Starter New Member

    Apr 26, 2010
    Attached is a circuit diagram of a simple photometer. I've just forgotten what I've learnt on electronics... So I'm not quite sure what are the functions of the 2 operational amplifiers in the circuit.

    TP1 (I think it's controlling the voltage..?) is adjusted by the user and the readout is TP2.

    It would be glad if any of you can provide some help on this question. Thanks!