[volt-nuts] How to measure micro-amp currents and have low impedance?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Sep 26 23:25:10 UTC 2009

Bruce Griffiths wrote:
> Use the Patterson transdiode connection with npn and pnp transistors as
> feedback elements.
> It works much better/more predictably at low currents than when signal
> diodes are used.
> Bruce
To handle 1A either a power opamp or an opamp with a high current output
buffer will be required.
Transistors with a collector current rating of 1A or more will also be


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