Found in a 1965 General Electric Hobby Manual, this timer was originally created to operate with photo magnifiers of the time. The circuit can be adapted for other purposes.
The PA222 integrated circuit used in this project from an American 1967 documentation is not...
The circuit shown in the figure trips when a slight swing causes the pendulum to touch the ring...
The integrated circuit used is a voltage reference from Motorola. This configuration was obtained in...