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This binary to decimal converter matrix was found in a 1964 General Electric publication. It can be used on modern equivalent circuits, including as a shield.
This circuit releases a lock only if the correct 4-digit sequence is entered. The circuit uses...
This 1960s Japanese 5-transistor radio is powered by 9 V and has good sensitivity for the medium...
This power supply uses a Raystor which is a 1964 LDR lamp coupler. The circuit was found in an...