poor mystic
- Apr 8, 2011
- 1,074
- Joined
- Apr 8, 2011
- Messages
- 1,074
So, a reliable constant current source that doesn't change over a day, and a really nice current meter to set your source by. Does that sound about right?
To drive 200 microamps with 20V implies eqivalent resistance of 100K, which is a reasonable resistance to use for control purposes.
To drive 20 nano amps with the same potential means 100megohms, and that's NOT a reasonably workable resistance.
Does the low current require a low voltage?