This circuit is suggested by Texas Instruments in old documentation. The components depend on the desired characteristics for the circuit. The power supply must be symmetrical.
This circuit was obtained in a 1985s English magazine. The circuit can still be assembled with...
This circuit was found in a 90s American documentation. The circuit uses an LED that can be of a...
The circuit presented is from the National Semiconductor's Linear Applications Handbook of 1994. We...