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 circuit can be used in demonstrations or science fairs. The circuit uses headphones and can...
We found this wiretapping circuit in a publication from the 90s. The circuit allows the cable...
This circuit uses a resonant reed switch at the trigger frequency. The circuit is from General...