The operational amplifier used in this circuit is uncommon today, but the configuration can be made with more modern operators. The power supply is symmetrical.
This circuit was found in an Electronic Experimenter Handbook from the 90's. The coil can be...
This touch switch uses components that have easy-to-obtain current equivalents. The power supply...
This circuit is an excellent shield for microcontrollers and was found in the October 1987 Radio...