Jameco Electronics Freeze the Dizz Manuale utente
Freeze the Dizz | Jameco Part No. 2161431
This project is based on a children‟s arcade game. Twenty LEDs are placed on a ring
and each takes turn to light up forming a rotating light spot. If a push-button switch is
pressed, the light spot freezes. If the light spot happens to land on the winning position,
a buzzer is triggered. The rotating speed is adjustable by a speed dial.
See a video demonstration here:
http://www.youtube.com/watch?v=3dcK2xYX3t4
You can learn basic building blocks of electronics circuit such as flip-flop (CD4013),
counter (CD 4017), one-shot and 555 oscillator with this project. You can see how they
are put together to achieve the circuit operations desired. You will test each individual parts
of the circuit to understand the roles of each IC and major components.
Experience Level: Intermediate | Time Required: 12-24 Hours
Kit Overview
Circuit Schematics
Circuit Operation
The circuit consists of the following major blocks: buzzer oscillator (U2B), clock
oscillator (U2A), two count-by-ten counters (U4, U5), alternating LED bank switches
(Q1, Q2, U3B), one-shot circuit (U3A) and LED drivers U6, U7, U8).
U2A (LM556 dual timers) is a 555 equivalent timer configured in the astable mode. The
frequency is adjusted by VR1.The output clock signal at U3 pin 5 is fed to pin 14 of U4
and U5 to run the CD4017 Decade Counters. Each counter‟s output bus Q0 through Q9
drives a bank of ten LEDs making them light up in sequence. The two counters U4 and
U5 operate in parallel. To form a single light spot with LED0 – LED19, one of the two
banks of LEDs will be suppressed. This is done by Q1 and Q2 each controlling a bank
and only one is allowed to turn on. Q1 and Q2 are controlled by U3B (CD4013 Dual
Flip-Flop). The Q-bar (pin 12) of U3B is connected to the Data input (pin 9) forming a
toggle flip-flop. When counter U4 completes one cycle of counting, a positive edge at
Cout (U4 pin 12) causes U3B outputs (pin 12 and 13) to toggle, switching the two LED
banks alternatively.
The outputs of counters U4 and U5 are delivered to U6, U7, and U8 (ULN2003
Darlington Array) to drive the 20 LEDs. The positioning of the LEDs is important. LED9
of U4 Q9 should be next to LED10 of U5 Q0 so that the light spot will run in sequence.
Each bank of LED takes one half of the ring driven by Q0 through Q9 of the counters. In
this configuration, you will notice that (for example) LED11 corresponding to U4 Q1 will
be directly opposite to LED1 of U5 Q1.
Even though the two counters are running in parallel, they may not count in sync as the
initial count during power up is uncontrollable. This is solved by sending the Cout pulse
of U5 at pin 12, through C6 and R16 (to shorten the pulse width) to reset U4 pin 15 so
that they will count in sync after the first reset pulse has arrived.
U3A is configured as a one-shot circuit. When SW1 is pressed, the Q output of U3A
flips to the high state. Through the delay action of R2 and C3, the flip-flop is cleared by
pin 4 after about 2 seconds. The one-shot pulse triggered by SW1 is delivered to U2A
pin 4 to stop the clock oscillator and the counting action of U4 and U5. The pulse also
lights up LED20 through U6 pin 7. Counting resumes when the pulse ends.
U2B is another 555 equivalent oscillator driving a piezo buzzer. Q3 acts as a logic
decision gate. To trigger a winning buzz, three criteria need to be established through
R8, R9 and R11. R8 signals that the one-shot circuit is triggered (SW1 pressed), R9
signals that the winning bank of LED is activated and R11 signals that the winning LED
is lit. Any other state will turn on Q3 and send a low signal to U3B pin 10 to suppress
the buzzer. The buzzer sound pitch is adjustable by trimmer resistor VR2.
The power is supplied by a wall power adapter that can provide 8 - 12V DC or AC.
Diode D1 protects the system against wrong power polarity and also serves as a
rectifier for AC power input. DC battery power of the same rating is also acceptable. The
LM78L05 voltage regulator provides +5V power supply to drive the electronics and
LEDs. The current consumption is very low with each LED consuming ~5mA and
~10mA for the buzzer. The total current consumption should not exceed 30mA at any
given time.
Required tools or supplies not included
Enclosure box
Low voltage signal wires
Wall power adapter, DC or AC 8 – 12V, 100mA (ex. Jameco part number 2100152)
Adhesive and fastener to secure components and circuit board
Soldering equipment
Digital Multimeter
Drill and hardware for enclosure box carpentry
Oscilloscope preferred.
Est. Time Required to Complete: 12 - 24 hours
Bill of material
Component
Quantity
Jameco
Part
Number
Manufacturer Part
Number
1
PIEZO BUZZER
1
2098523
2
SW1, Switch Push Button OFF (ON)
1
315432
3
Connector Power Male 3 Position
1
151590
4
PROTOTYPE BUILDER,4.5 INCH x3.3 INCH ,PCB
1
105137
5
U1, Standard Regulator 5V, 100mA
1
51182
78L05
6
D1, DIODE, 400V, 1A
1
35991
1N4004
7
VR1, POTENTIOMETER,1M,RV24AF-10-15R1-
B1M,LINEAR TAPER, 1/2 WATT,.335 INCH
1
255582
8
KNOB,1/4 INCH SHAFT,27.1MM,JK-
901C,BLACK/ALUMINUM,WITH SET SCREW
1
264955
9
VR2, POTENTIOMETER,100K OHM,3362P-
104LF,SINGLE TURN,.5 WATT,CERMET
1
254036
10
U2, IC,LM556N,DUAL TIMER,DIP-14
1
24328
LM556CN
11
U3, IC, CD4013, DIP-14
1
12677
CD4013
12
U4, U5, IC, CD4017, DIP-14
2
12749
CD4017
13
U6, U7, U8, Transistor Darlington NPN 50V 0.5A 16-Pin
PDIP
3
34278
ULN2003A
14
U2, U3 SOCKET, IC,14PIN
2
37197
15
U4 - U8 SOCKET, IC,16PIN
5
37402
16
Q1, Q2, TRANSISTOR,2N3906,PNP,GP
2
38375
2N3906
17
Q3, TRANSISTOR,2N3904,NPN,GP
1
38359
2N3904
18
LED0 - LED19, LED, Uni-Color Green
20
693901
19
LED20, LED, Uni-Color Red
1
2006730
20
C1, C2 CAP,RADIAL,100uF,50V,20%,85C
2
29962
21
C3, CAPACITOR,RADIAL,1UF,25V, 20%,85C
1
330431
22
C4, CAP,MONO,.22uF,50V,20%
1
25540
23
C5, C8, CAP,MONO,.1uF,50V,20%
2
25523
24
C6, CAP,MONO,.001uF,50V,20%
1
81517
25
C7, CAPACITOR,CERAMIC,DISC,.0022UF
1
1947386
26
C9, CAP,RADIAL,4.7uF,50V,20%,85C
1
31000
27
R1, R12, R14, R15, RESISTOR,CARBON FILM,47K
OHM,1/4 WATT,5%,
4
691260
28
R2, RESISTOR,CARBON FILM,2M OHM,1/4 WATT,5%
1
691649
29
R3, R4, R13, R16, RESISTOR,CARBON FILM,10K
OHM,1/4 WATT,5%
4
691104
30
R5 - R7,.RESISTOR,CARBON FILM,680 OHM,1/4
WATT,5%
3
690822
31
R8 - R11, RESISTOR,CARBON FILM,470K OHM,1/4
WATT,5%
4
691500
Component pin identification
Component
Pin Identification
Schematic representation
U1, 78L05,Voltage
Regulator
D1, 1N4004, Diode
U2, LM556, IC, Dual
Timer
U3, CD4013, IC, Dual
„D‟-Type Flip-Flip
U4, U5, IC, CD4017,
Decade Counter
U6, U7, U8, IC,
ULN2003, Darlington
Array
Q1, Q2, 2N3906,
PNP Transistor
Q3, 2N3904,NPN
Transistor
LED0 - LED19, Green
LED
LED20, Red LED
C1, C2, C3, C9,
Electrolytic Capacitor
C4 – C8, Capacitor
R1 – R15, Resistor,
0.25W
SW1, Push Button
Switch
Power Jack (center
positive)
VR1,
POTENTIOMETER
VR2, Trimmer
Resistor
PIEZO BUZZER
Resistor color codes (5% error tolerance)
Name
Value
Resistor color code
R1, R12, R14, R15
47K
Yellow-Purple-Orange-Gold
R2
2M
Red-Black-Green-Gold
R3, R4, R13, R16
10K
Brown-Black-Orange-Gold
R5, R6, R7
680
Blue-Grey-Brown-Gold
R8, R9, R10, R11
470K
Yellow-Purple-Yellow-Gold
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