We found this circuit that can reach 50 MHz in the February 1997 Electronics Now magazine. The integrated circuits used are not very common today.
The integrated circuit used is a version close to the 555 manufactured by Motorola. The circuit shown...
The circuit shown is from an American publication from 1970. It produces a tone that attracts fish...
Suggested by General Electric documentation from 1968, this circuit activates a relay after 60...