This traditional configuration with the 555 was obtained in an 80s Hands-On Electronics. The relay is of the sensitive type according to the supply voltage.
This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of...
This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The...
This circuit serves as an audio output for AM or even FM radios and was found in a Radio...