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 is one of the many versions of this type of indicator that the reader can find on our...
This circuit, which can be seen elsewhere on this website, was obtained from a 90’s English...
We found this CMOS circuit based on the PLL4046 in the December 1989 issue of Radio Electronics magazine....