one-armed bandit - uses LEDs

july/august 1984 . . . uses LEDs We present a new game that might be described as a sort of electronic one-armed bandit. The good news is, however, that you don"t have to put money into it; the bad news is that you cannot win money from it either. So, for the stakes, you"ll have to come to an agreement with your playing partners. The circuit is based on a type 4024 seven-stage binary counter/divider. At the beginning of the game it is reset by spring-loaded press-to-make switch S2. The counter outputs, 01 . . . Q7, are then logic low, and the LEDs, D1 . . . D5, are out. The output of NAND Schmitt trigger N2 is high and switches on relaxation oscillator N3. The oscillator signal is inverted in N4 and this turns on amplifier T6 so that LED D6 lights. The game is started by pressing another spring-loaded push-to-make switch, S1, when oscillator N1 is turned on and clocks the counter. As soon as S1 is released, N1 ceases to oscillate and the counter stops at a random output combinatio...