Timer for Windshield Wiper (CB19868E)

This circuit found in old documentation can be used on old cars that do not have this feature. The integrated circuit used is uncommon today.

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Telephone Monitor (CB12655E)
This circuit of a 1978 American publication monitors a telephone line by triggering a relay. The...
Shunt motor control (CB7939E)
Found in 1965 General Electric technical documentation, this half-wave circuit controls shunt type...
Variable Power Supply for the Experimenter (CB16079E)
The power supply shown in the figure provides voltages between 0 and approximately 15 volts, with...