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VCCS with coil dual drive?

Discussion in 'Electronic Design' started by Robert Marks, Nov 3, 2004.

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  1. Robert Marks

    Robert Marks Guest

    I am using an LM358 to apply a dual drive to a 2K solenoid at 1-100Hz.
    It runs off 4 "AAA" cells.

    This is a device to calibrate magnetometers, so maximum field
    intensity and waveform fidelity is desirable.

    As there is no load reference to earth in this configuration, what is
    the simplest way to sense current in the coil and provide feedback to
    each of the op amps in the dual package?

    Thanks very much for any advice.

  2. Mac

    Mac Guest

    If you want a VCCS, maybe you should go read the recent thread in
    sci.electronics design (this group) with this subject: "Bipolar current
    source for muscle stimulations"

    You might also appreciate the recent episode of the Bob Pease Show which
    dealt with current sources:

    You want episode 6.

    Whatever solution you use, you will probably end up needing very closely
    matched resistors.

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