This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
This circuit is from a 1970 publication. The time constant is given by 1.3R x C where R is the...
This oscillator can generate signals up to a few megahertz depending on the crystal used. Actually...
This circuit was obtained from a Popular Electronics of 1994. The magazine no longer exists in its...