Found in a 1967 Ferranti documentation, this circuit uses a LDR from that time as a sensor. Transistors can be replaced with modern equivalents.
Taiwan Semiconductor Dual N Channel MOSFET Taiwan semiconductor makes available through Mouser...
This circuit was obtained from my Mechatronics Sourcebook, published in the United States. In it...
This combination key or code key was found in old documentation. The consumption is very low, and...