Making a 2/4 channel buzzer with light
AND1, NOR1, NOR2 are the basic cell you need. AND2 needs to have as many inputs as there are flip-flops. NOR1 and NOR2 are an RS flip flop and AND1 is an enable gate which only transfers the SET input as long all flip flops are in reset (enable lines all high).







simulate this circuit &ndash; Schematic created using CircuitLab