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 was found in the October 1987 Radio Electronics magazine. The triac must be matched to...
Found in a 1980s American documentation, this circuit can use a SCR and a general-purpose transistor....
The circuit shown is from National Semiconductor's Linear Applications Handbook. The LM3900 is a...