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.
This circuit is suitable for testing motor starting capacitors. Capacitors from 2 to 8 uF are...
The circuit shown is from an old English publication from 1965. We can adapt the circuit to work...
This circuit, from a 1978 publication, can be made with more modern transistors such as the TIP42,...