This circuit for the 3 to 6 MHz band was found in a 90s Popular Electronics. The components of the network formed by C6 depend on the frequency range to be covered.
This circuit for very long-time intervals was found in the March 1993 Radio Electronics magazine. Times...
This circuit can operate with signals up to 60 MHz using the indicated operational. We found it in...
Activating a relay from pulses (from a monostable, for example) can be useful in many types of...