This circuit was found in the August 1994 issue of Electronics Now magazine. The 4046 is uncommon these days and the frequency range is given by C1.
This circuit came out at a Wireless World in January 2000. The circuit can be easily assembled as it uses...
We found this transmitter circuit for different frequency ranges in a 1992 documentation. The...
This TTL circuit can be used as a shield, controlled by one of the inverters. The circuit must be...