Precision Adjustable DC Current Source: With integrated hi-Z voltmeter

摘要

Parroting the Science Class teacher an adjustable current source consist of any old voltage source, a variable resistor and applying Ohm's law, right? In Elektor Class, the project described here is the next dimension after I equals V-over-R, offering precision and versatility rivaled only by $$$ gear found in professional labs. How about a lowest range of 10 nanoamps? There are numerous ways to build direct-current (DC) sources, mainly depending on the required characteristics: current strength, fixed or adjustable, single or dual polarity, floating or grounded load, precision, anything else?