This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit is powered by only 3 V and can be used for signaling.
This circuit, from a 1977 documentation, uses two 555 or one 556 (double 555), being able to...
This 1967 Raytheon circuit uses a Raystor, an optical coupler with a lamp and an LDR. The circuit...
This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120...