Elenco One Button Bandit User Manual

ONE BUTTON BANDIT KIT

MODEL K-34

Assembly and Instruction Manual

Elenco™ Electronics, Inc.

Copyright © 1989 Elenco™ Electronics, Inc. Revised 2002 REV-D 753234

PARTS LIST

If you are a student, and any parts are missing or damaged, please see instructor or bookstore.
If you purchased this One Button Bandit kit from a distributor, catalog, etc., please contact Elenco™ Electronics
(address/phone/e-mail is at the back of this manual) for additional assistance, if needed.

RESISTORS

Qty. Symbol Value Color Code Part #

3 R1, R3, R5 220W 5% 1/4W red-red-brown-gold 132200
1 R10 1kW 5% 1/4W brown-black-red-gold 141000
1 R8 18kW 5% 1/4W brown-gray-orange-gold 151800
4 R2, R4, R6, R7 100kW 5% 1/4W brown-black-yellow-gold 161000
2 R9, R13 1MW 5% 1/4W brown-black-green-gold 171000
1 R12 2.2MW 5% 1/4W red-red-green-gold 172200
1 R11 4.7MW 5% 1/4W yellow-violet-green-gold 174700

CAPACITORS

Qty. Symbol Value Description Part #

1 C2 .1mF (104) Discap 251010
4 C1, C4, C5, C6 1mF Electrolytic 261047
1 C3 4.7mF Electrolytic 264747

SEMICONDUCTORS

Qty. Symbol Value Description Part #

9 D16 - D24 1N4148 Diode 314148
3 U1, U2, U3 4017 Integrated Circuit 334017
1 U4 MC14584 or CD40106 Integrated Circuit 334584
12 D2-5, D7-10, D12-15 LED Red 350002
3 D1, D6, D11 LED Green 350010

MISCELLANEOUS

Qty. Description Part #

1 PC Board 518034
1 Push Button Switch (S2) 540101
1 Slide Switch (S1) 541022
1 Battery Holder 590096
1 Buzzer Piezoelectric (BZ) 595201
4 Plastic Spacer 624112
3 Screw 2-56 x 5/16” 641231
4 Screw 2-56 x 3/4” 641233

PARTS IDENTIFICATION

Resistor

Diode

Battery Holder

Capacitors

Electrolytic

Screws and Nut

2-56 x 3/4”

Discap

2-56 x 5/16”

Shown actual size.

Qty. Description Part #

7 Nut 2-56 Hex 644201
7 Flat Washer 645600
1 14-pin Socket (U4) 664014
3 16-pin Socket (U1, U2, U3) 664016
1 Cover Sheet 750915B
1 Wire 22 Black Solid 8” 814120
1 Solder Tube 9ST4

Integrated Circuit

IC Socket

LED

Spacer

Flat Washer

2-56

Switches

Slide

Push Button

Buzzer

-1-

IDENTIFYING RESISTOR VALUES

Use the following information as a guide in properly identifying the value of resistors.

Bands

1 2

Multiplier

Tolerance

BAND 1

1st Digit

Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9

BAND 2

2nd Digit

Color Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9

Multiplier

Color Multiplier
Black 1
Brown 10
Red 100
Orange 1,000
Yellow 10,000
Green 100,000
Blue 1,000,000
Silver 0.01
Gold 0.1

Resistance

Tolerance

Color Tolerance
Silver +
Gold +5%
Brown +1%
Red +
Orange +3%
Green +.5%
Blue +
Violet +.1%

10%

2%

.25%

IDENTIFYING CAPACITOR VALUES

Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads), or mF (microfarads).
Most capacitors will have their actual value printed on them. Some capacitors may have their value printed in
the following manner.

Second Digit

First Digit

103K

100

Multiplier

Tolerance

Multiplier

10mF 16V

For the No.01234589
Multiply By 1 10 100 1k 10k 100k .01 0.1

Note: The letter “R” may be used at times to
signify a decimal point; as in 3R3 = 3.3

The above value is 10 x 1,000 = 10,000pF or .01mF The letter K indicates a tolerance of +10% The letter J indicates a tolerance of +5%

INTRODUCTION

The One Button Bandit is better known in Las Vegas
as the One Arm Bandit. Our device has no arms,
but instead a button. Therefore, we call it the One
Button Bandit.

The One Button Bandit is a simplified version of an
electronic slot machine. It contains three columns of

THEORY OF OPERATION

Figure 1 shows the block diagram of the One Button
Bandit. This block diagram consists of three
identical circuits: (the basic has a timer, a decade
counter, and five LEDs), the Clock Oscillator, the
Sound Circuit and the Key of Ring.

five light emitting diodes (LED). When the switch S2
is pressed, the LEDs will flash on and off
accompanied by sound. When the bandit stops,
only one LED in each column will remain lit. If three
green LEDs light up, you win the jackpot
accompanied by sound.

1

LEDs

2

LEDs

Clock

Timer

Counter

Timer

Counter

Figure 1

Timer

3

Key

Ring

Sound
Circuit

-2-

Counter

LEDs

THE CLOCK OSCILLATOR

The clock oscillator is an electronic circuit that puts
out a series of high and low voltages. It is a square
wave oscillator whose frequency is controlled by the
value of resistor and capacitor (see Figure 2a). The
clock oscillator consists of Part A of the MC14584
integrated circuit. Figure 2b shows a diagram of the
MC14584.

The MC14584 is a hex schmit trigger. The values of
R7 and C1 chosen give a frequency of about 30
cycles per second. When the switch S1 is turned
ON, the clock circuit oscillates pulses. The pulses
will be before switch S1 is in the “ON” position. They
go to the clock input of decade counters U1, U2 and
U3 pin 14.

pulse will move the output one position. Connect an
LED to the output, it will light only when the output
goes high. It is obvious that when the clock is
running, the LEDs will flash on and off with the
speed of the clock. When the clock stops, only one
LED will be lit.

In this design, 5 LEDs are used per IC, but the
counter has 10 outputs. If the clock stops at an
output without an LED, nothing will light. To prevent
this, the 4017 IC is reset after hitting the 5th output.
This is simply done by tying the 6th output to the
clear pin (pin 1 and pin 15 shorted together). When
the clock triggers output 5 on, the next pulse goes
back to output 1.

A

2

B

4

C

6

D

8

E

10

F

12

R

C

Figure 2a

1

3

5

9

11

13

Figure 2b

THE DECADE COUNTER

The 4017 IC is a 5 stage divide by 10 counter.
Figure 3 shows a diagram of this IC.

14

15

Clock

1

Clock

Enable

Reset

C

VCC - Pin 16
GND - Pin 8

Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9

OUT

3
2
4
7
10
1
5
6
9
11
12

Figure 3

This IC has 10 outputs and a clear input. Only one
of the 10 outputs will be high at any given time. The
other 9 will be low. Let’s assume that output 1 is
high. If a pulse is fed into the clock input, output 1
will go low and output 2 will go high. Each clock

THE TIMER

The One Button Bandit has three timers. The timers
start when you turn ON the push button switch. The
timers consist of Part D of the MC14584, R13 and
C6; Part E and R12, C5; Part F and R11, C4. The
values of the resistors and capacitors give the times
of work for each decade counter.

THE LIGHT EMITTING DIODES (LED)

The operation of the LED is very simple. When
current flows through the LED, it will emit light. Note
that the LED is connected between an IC output and
ground through a resistor. When the IC output goes
high, the LED will light. The resistor limits the current
so that the LED will not be damaged.

THE SOUND CIRCUIT

This circuit consists of the buzzer’s oscillator and the
piezoelectric buzzer. The oscillator consists of Part
B of the MC14584 integrated circuit. The value of
resistor R8 and capacitor C2 chosen given a
frequency of about 3000 cycles per second. This
oscillator oscillates pulses only when the decade
counters work. The pulses from this oscillator go to
the buzzer. It is accompanied by sound when the
bandit works.

THE KEY OF RING

When the One Button Bandit stops and the three
green LEDs light, you will get the ring signal. This
sound signal will be before you push the switch S2
again. The Key of Ring is an oscillator and consists
of Part C of the MC14584. The values of resistor R9
and capacitor C3 give the frequency of ring sound.

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