Both the operational amplifier and the diodes admit equivalents in this circuit suggested by National Semiconductor. The power source must be symmetrical, and the circuit curve resembles an ideal diode.
In the figure we show how to use an LM324 as a voltage comparator the reference voltage is...
This circuit was found in an old publication and operates in the 455 kHz IF band since the...
This circuit is from a Motorola manual from the 70s. The circuit can be implemented with more...