Found in Ferranti's 1969 documentation this circuit has a maximum operating frequency of 7.5 MHz. The circuit can be designed with modern transistors.
This circuit was found in an American documentation from 1968. The circuit uses transistors from that...
This circuit triggers a relay when the light that falls on the LDR is cut off. The sensitivity is adjusted...
Suggested by the General Electric Hobby Manual of 1965 this circuit measures voltages from 0 to...