This applet demonstrates a three-input logical AND and a two-input logical NAND built with relays.
Click the input switches or type the ('a','b','c') and ('d','e') bindkeys to control the circuit and watch the behavior.
The upper circuit uses three relays, with the coil of each relay connected to one input and ground. Therefore, the relays will activate whenever their corresponding input is driven to a (strong) high level.
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