This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a power outage occurs. Time depends on capacitor C1.
This experimental good sensibility radio was obtained from a 1968 magazine. The magazine no longer...
This simple musical instrument was obtained from a 1967 magazine. If the original transistors are...
This circuit triggers a relay when the phone rings. An application is like remote doorbell. The circuit...