Elektor One-armed Bandit Kit

Pull Down Lever For Highest Score!

This Elektor Circuit Classic from 1984 shows a playful application of CMOS 400x series logic ICs in combination with LEDs, a highly popular combination at the time. The project imitates a spinning-digit type slot machine.

The Game

To play the game, first agree on the number of rounds. Player 1 actuates the switch lever as long as desired and releases it. The LEDs then show the score which is the sum of the 50-20-10-5 digits lit up. If the Play Again! LED lights, Player 1 has another, “free” round. If not, it’s Player 2’s turn. The players keep tab of their scores, and the highest score wins.

Features

• LEDs Indicate Score
• Multi-Player and Play Again!
• Elektor Heritage Circuit Symbols
• Tried & Tested by Elektor Labs
• Educational & Geeky Project
• Through-Hole Parts Only

Included

• Printed Circuit Board
• All Components
• Wooden Stand

Bill of Materials

• Resistors (5%, 250 mW)
• R1,R2,R3,R4 = 100kΩ
• R5,R6,R7,R8,R9,R10 = 1kΩ
• Capacitors
• C1 = 4.7nF, 10%, 50V, 5mm
• C2 = 4.7μF, 10%, 63V, axial
• C3,C4 = 100nF, 10 %, 50V, ceramic X7R, 5mm
• Semiconductors
• LED1-LED6 = red, 5mm (T1 3/4)
• IC1 = 74HC4024
• IC2 = 74HC132
• Miscellaneous
• S1 = switch, toggle, 21mm lever, SPDT, momentary
• S2 = switch, tactile, 24V, 50mA, 6x6mm
• S3 = switch, slide, SPDT
• IC1,IC2 = IC socket, DIP14
• BT1 = PCB-mount CR2032 battery retainer clip
• Desktop Stand
• PCB 230098-1
• Not included: BT1 = CR2032 coin cell battery