This circuit activates a garage door by the car headlights car or a lantern. The circuit is from a 1967 documentation, making use of period components.
In fact, this circuit found in a Japanese publication from the 1960s will work with any...
We found this circuit in the Linear Technology Applications of 1997. The circuit uses components of the...
We found this circuit in a 1965 publication by General Electric. The zener is 8.2 V x 1 W and the...