Wiring And Schematic

Ive had a few requests for a quiz schema, so here is a 4 input design which can easily be modified. Maybe, I should write the application notes in the style of a game show host...

New Quiz Circuit diagram

Notes:
This design uses four ICs and has four input diagram and four independent outputs and a single master reset switch. The outputs here are LEDs but may be modified to drive lamps or buzzers. Only one output LED can be lit at any time. The first person to press their input switch, A,B,C,D will light the corresponding output LED, disabling the other inputs.

The schema uses all CMOS ICs part numbers shown on the diagram. The supply voltage may be anything between 3 and 15 volts. Alternatively, it may be built using equivalent TTL ICs and powered on 5 volts. The main component in this schema is a bistable latch, here it is based on the dual 4013 D-type flip flop.

Circuit Operation:
Pressing the reset switch will clear all flip flops and extinguish any lit LEDs. Under this condition the Q outputs will all be low (logic 0) and NOT Q outputs will be high (logic 1). All four NOT Q outputs are fed to a 4 input AND gate, the 4082 whose output will also be high. The output of the 4082 is wired to one input of each 2 input AND gate (4081). Switch inputs A,B,C,D are all non latching push button switches, the first person to press their switch will cause the corresponding AND gate (4081) to go high and trigger the preset input of the 4013 D-type flip flop.

This will latch and light the appropriate LED. Also the triggered flip flop will have its NOT Q output, set at low, this changes the 4082 output to low and prevents any further triggering of the other flip flops. Switch contact de-bouncing is not required as the first press will latch one of the bistables. Pressing the reset switch, restores the schema to its former state. I would recommend using heavy duty push button switches, as in use they are likely to be under some stress.