This circuit transmits in the FM band. It is a good range FM transmitter found in a 90's Silicon Chip documentation. The integrated circuit used can be difficult to obtain.
This dimmer for high-powered incandescent lamps was found in a 1967 General Electric manual. The...
This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1...
Found in Linear Technology documentation, this circuit drains only 70 uA of the monitored circuit....