This CMOS 4001 oscillator alternately turns the relay on and off at times set by R2. The circuit is from Electronics Now magazine, June 1995.
This circuit is from an Electronics World of 1967. The circuit slows down the activation of a...
This metal detector circuit uses an AM radio as an indicator. The radio is placed off-station and tuned...
In the figure we have a sensor circuit that makes use of common transistors and a photo diode as...