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.
The configuration shown in the figure is a second order filter (12 dB per octave) with an...
This transmitter, indicated for espionage applications, is permanently powered by the power grid....
This circuit was obtained in an old French publication from the 80s. The maximum power of the lamp...