This sensor circuit for currents of the order of nanoamperes was found in an American documentation from the 1980s. The components are from that time.
January 2017 - New ROHM TFZV series of zener diodes is now available from Mouser Electronics. The...
This circuit was found in a Popular Electronics from the 90s applying to common automotive...
This circuit is from a 1969 Electronics World. It generates 100 kHz sinusoidal signals determined...