A circuit to detect hFE of a NPN BJT. The hFE value of given NPN BJT is expected to be nearly equal to voltage (mV) on collector resistor. This circuit is based on http://www.op316.com/tubes/mi-audio/hfe-tester.htm
I am using this to guesstimate the effective hFE of NPN BJTs connected in (inverted) darlington.
