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.
The Texas Instruments OPAx145 Series of Operational Amplifiers is available from Mouser...
This circuit consists of a variation of the previous one being activated when the switch is...
This circuit can be used with the CB4296E receiver or others described on this site. The circuit...