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Jameco Electronics Freeze the Dizz Instructions Manual

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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
of the circuit to understand the roles of each IC and major components.
Experience Level: Intermediate | Time Required: 12-24 Hours
. You will test each individual parts

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Summary of Contents for Jameco Electronics Freeze the Dizz

  • Page 1 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.

  • Page 2: Kit Overview

    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.
  • Page 3 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.
  • Page 4 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.

  • Page 5: Bill Of Material

    Bill of material Jameco Manufacturer Part Component Quantity Part Number Number PIEZO BUZZER 2098523 SW1, Switch Push Button OFF (ON) 315432 Connector Power Male 3 Position 151590 PROTOTYPE BUILDER,4.5 INCH x3.3 INCH ,PCB 105137 U1, Standard Regulator 5V, 100mA 51182 78L05 D1, DIODE, 400V, 1A 35991...
  • Page 6 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...
  • Page 7 U4, U5, IC, CD4017, Decade Counter U6, U7, U8, IC, ULN2003, Darlington Array Q1, Q2, 2N3906, PNP Transistor Q3, 2N3904,NPN Transistor...
  • Page 8 LED0 - LED19, Green LED20, Red LED C1, C2, C3, C9, Electrolytic Capacitor C4 – C8, Capacitor...
  • Page 9 R1 – R15, Resistor, 0.25W SW1, Push Button Switch Power Jack (center positive) VR1, POTENTIOMETER VR2, Trimmer Resistor PIEZO BUZZER...
  • Page 10 Resistor color codes (5% error tolerance) Name Value Resistor color code R1, R12, R14, R15 Yellow-Purple-Orange-Gold Red-Black-Green-Gold R3, R4, R13, R16 Brown-Black-Orange-Gold R5, R6, R7 Blue-Grey-Brown-Gold R8, R9, R10, R11 470K Yellow-Purple-Yellow-Gold...
  • Page 11 Project Steps Step 1: Enclosure box planning and construction Objective: Enclosure box with components installed A cookie gift box made from cellulose or plastic material is ideal for this project. It should be about the size of a 12" pizza box. Plan the locations of the LED ring (LED0 – LED19), SW1, LED20, VR1, power jack and the buzzer.
  • Page 12 Step 2: Component placement on circuit board Objective: Place circuit board components This is a component planning step without soldering. Insert all components on the circuit board without soldering. Pay attentions to the signal flow of the circuit. The recommended placement is to arrange the ICs in 3 rows. U6, U7, U8 are on the top row, with their outputs (pin 10 - 16) close to the top edge of the board where some 20 wires will go to the LED ring.

  • Page 13: Step 3: Circuit Board Wiring

    Step 3: Circuit board wiring Objective: Solder circuit board components and wires Solder the components on the circuit board according to the wiring diagram below. It is recommended to start with the top side signal wiring, then bottom side signals followed by top side power ground and bottom side power ground wires.
  • Page 14 Use the wiring plan as the reference. Do not use the prototype photos. The kit might contain slightly different components.
  • Page 15 Step 4: External component wiring Objective: Solder all components and wires This step completes all internal and external wiring of the circuit. The wiring diagram is shown below. It is a good practice to label the external wires because you may need to unconnected and re-connect some wires to locate problems.
  • Page 17 Step 5: Project completion and testing Objective: Final circuit testing and IC installation There are many components and wirings in this project. Wiring errors may cause the circuit behave in unexpected ways. Severe errors like shorting an IC pin to power or ground may cause permanent damage to the component.

  • Page 18: Circuit Testing

    Circuit Testing All electrical construction and wiring should be completed before conducting circuit testing. Completion of mechanical construction is not necessary. Make sure that you follow the test procedures below in the order described. This is essential to ensure that you have wired the components properly. It also minimizes the risk of permanently destroying any IC due to improper construction or soldering.
  • Page 19 Figure 1. ICs and pin locations for Tests 1A, 1B, 1C and 1D. Test 1B: +5V network continuity This is the same as Test 1A but repeated for the +5V network. The following test points should be connected: Test 1B: Test-points for +5V network continuity test.
  • Page 20 Test 1C: IC output short-circuit This is an important test ensure that no output pin of any IC is shorted to the power or the ground network. This condition often causes large current to flow through the ICs leading to permanent damages. Do not insert U2 through U8. Do not apply any power to the circuit during this test.
  • Page 21 Test 1D: Power supply of IC sockets U2 pin 14 U2 pin 7 U3 pin 14 U3 pin 7 U4 pin 16 U4 pin 8 U5 pin 16 U5 pin 8 Figure 2. Measuring power supply of IC sockets in Test 1D. Test 2A: Buzzer oscillator With Tests 1A, 1B, 1C and 1D, you have verified that the proper power supply has been delivered to the IC sockets and there are no severe abnormal conditions of the power...
  • Page 22 Disconnect the power supply and insert U2 (LM556). Do not insert U3 through U8. Use a “bypass lead” to connect between pin 7 (GND) and pin 12 (Q-bar) of U3 socket. A scrap pin lead from a resistor or capacitor is ideal for this purpose. Use another bypass lead to connect between pin 8 and pin 13 of U8 socket.
  • Page 23 Check the waveform at pin 14 of the U4 socket with an oscilloscope. You should see a square wave with 5Vp-p. Adjust VR1 to make sure that the oscillator frequency can change between 3 to 150Hz. Check VR1, R15, C4 and C5 if the oscillator is not working.
  • Page 24 Dial VR1 to about half turn position and apply power. Measure the voltage at pin 14 of U4 socket. It should be about 2.5V. If you reduce the resistance of VR1, the oscillator should run at a higher frequency and higher duty cycle. This will increase the voltage reading.
  • Page 25 Figure 5. Counter outputs and Carry Out signals. The sync pulse at pin 15 U4 occurs when the Carry Out (pin 12) of U5 goes from low to high. At that time, C6 and R16 generate a positive pulse of about 1us to reset U4 to zero count so that U4 and U5 will synchronize their counting.
  • Page 26 Figure 6. Counter sync pulse at U4 pin 15. Test 3 without oscilloscope Disconnect power supply and insert U4 and U5, CD4017. Do not install U3, U6, U7 and U8. Install a bypass lead between pin 2 and pin 14 U3 socket. The test setup is shown in Figure 5.
  • Page 27 should stabilize at 0.5VDC. If the voltage value is jumping and difficult to read, you can put a large capacitor (for example, 1uF) across the two DMM probes to try to get a sable reading. Repeat the measurement for the following signals of the counter pins: 1, 2, 3, 4, 5, 6, 7, 9, 10, and 11.
  • Page 28 Figure 7. Testing counters and LED drivers in Test 4. Apply power and you should see two LED light spots running in sequence, one from each counter. Check the counting sequence of the LEDs to make sure that you have soldered the wiring properly.
  • Page 29 If you concluded this test, you have completed the electronic construction of the project. Figure 8. All wiring completed and ICs installed.
  • Page 30 Summary of test procedures Test procedures Test Test points Passing criteria setup 1A: Continuity test Fig. 1 U1 GND pin All test-points should be of GND network. U2 pin 7 connected and have near zero No power supply. U3 pins 3, 5, 7, 8, 10 resistance.
  • Page 31 Test 2B without Fig. 4 U4 pin 14 2.5VDC at test points, oscilloscope. U5 pin 14 increasing voltage with higher frequency (smaller resistance at VR1). No 0V or 5V constant voltage at test points. Test 3: CD4017 Fig. 5, 6 U4 pins 1, 2, 3, 4, 5, 6, 7, Positive pulse for every 10 counters U4, U5.

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2161431