This bank of switches can be programmed in a variety of ways for logic experiments. The circuit is from August 1986 Radio Electronics magazine.
This circuit was obtained in Motorola documentation from 1969. The components are from that time. In...
Originally, this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...
This circuit was obtained in a Electronics World of 1968. The transistors can be equivalent as the BC558...