This circuit was found in a 90s Electronic Engineering. The quadruple operational amplifier can be replaced by an equivalent. RL determines the tested resistance range.
This amplifier was found in a Maxim documentation from the 90's. The circuit is an inverter type with...
This interesting circuit was found in a 1968 documentation. The transistor can be a...
This circuit suggested by Motorola can be used as LED high frequency modulator. One possible...