This voltage follower or amplifier with unit gain uses an unusual operational amplifier nowadays. The circuit can be implemented to use modern operationals. The power supply must be symmetrical.
This circuit was found in a 1971s English magazine. We can still assemble it using BC548...
This circuit, which appears in other applications on this site, was taken from a 2000...
This circuit produces a sinusoidal signal whose frequency can be calculated using the formula next...