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.
The integrated circuit used in this old configuration is not common today. In it we have the way...
In the figure we have a diagram of a thermostat using an NTC and an operational amplifier 741. The...
For those who work with reproduction or development of photographs or simply like to cook their egg...