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.
When the power is turned on, the output of this circuit goes to the “1“ logic level by a time...
This circuit was found in an old manual of linear integrated circuits of the 80's. Equivalent...
This is the normal circuit of a relaxation oscillator using an unijunction transistor such as the...