This circuit was found in documentation from the 90s. The operational amplifier admits an equivalent. The circuit has frequency ranges up to 5kHz determined by R1.
In the figure we have a circuit suggested by National Semiconductor, using an operational...
We found this circuit in a Popular Electronics from 1992. It modulates an infrared LED with a...
This receiver amplifier (booster) is from American documentation from the 1970s. The integrated circuit...