Re: difference amplifier offset trimming

Hi John,

I am confused about the following things

1. What kind of transformer should I use, power transformer, current
transformer, pulse transformer . Current ( range 10nA to 1mA) is the
input to the transformer (primary) and current is the output of the
transformer , my load is 100kohm.

2. What should be the winding ratio?

3. Input current waveforms are arbitray, continuous, pulses ( single
or many ) and brust waveforms?

4. I need the same replica of the input waveform. I suspect that the
primary winding (inductor) will introduce high pass filtering, what
should be done to avoid that?

How would it be, that you specify your needs complete. Elsewise we allways
have to read in a big crystal ball...
What I know:
You want to stimulate a small tissue (retina of a rat), so your electrodes
may be pretty small (needle electrodes?). You expect a impedance about 100
kohm (which will be very frequency depending not only one value for all).
Your current peaks will be up to 1 mA. The waveform is arbitrary. You didn't
talk anything about duration repetition rate....

A few infos more please then someone may help with concrete tips.

Marte

If you are interested in my help, then please write me the specification via
email. here in this group the message may reach me or not. there is too much
garbage arounud :-(



.

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