Jameco Electronics Freeze the Dizz Скачать руководство пользователя

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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. Ea

ch 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

Содержание Freeze the Dizz

Страница 1: ...ggered 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 cir...

Страница 2: ...d 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...

Страница 3: ... 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 buzz...

Страница 4: ...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 ...

Страница 5: ...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...

Страница 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 ...

Страница 7: ...U4 U5 IC CD4017 Decade Counter U6 U7 U8 IC ULN2003 Darlington Array Q1 Q2 2N3906 PNP Transistor Q3 2N3904 NPN Transistor ...

Страница 8: ...LED0 LED19 Green LED LED20 Red LED C1 C2 C3 C9 Electrolytic Capacitor C4 C8 Capacitor ...

Страница 9: ...R1 R15 Resistor 0 25W SW1 Push Button Switch Power Jack center positive VR1 POTENTIOMETER VR2 Trimmer Resistor PIEZO BUZZER ...

Страница 10: ...olerance 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 ...

Страница 11: ... power jack and the buzzer Drill holes and attach components The winning location shown on the circuit schematic is LED13 connected to U6 pin 7 With the LED ring installed solder the anode longer leads of LED0 LED9 together forming the first bank to be connected to R6 Do the same for the second bank LED10 LED19 to be connected to R7 You might want to spray paint the box before installing the compo...

Страница 12: ...on the center row with pin 1 facing U6 U7 U8 ULN2003 U2 LM556 and U3 CD4013 are placed at the bottom row with transistors resistor and capacitors near them Run wires from the circuit board to the power jack VR1 SW1 buzzer LED0 LED19 Try to arrange the components so that these external wires access the circuit board near the sides Some components may have a different size than the placement plan gi...

Страница 13: ...w 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 Pin 9 of U6 U7 and U8 are unconnected Pay attention to the pin configuration and polarity of Q1 Q2 Q3 U1 D1 C1 C2 C3 and C9 Note that the components are mirrored left right when viewed from the bottom side ...

Страница 14: ...Use the wiring plan as the reference Do not use the prototype photos The kit might contain slightly different components ...

Страница 15: ...nal 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 Wrong wiring may cause damages to electronic components Use the continuity test of DMM to check wiring ...

Страница 16: ......

Страница 17: ...is 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 The Circuit Testing procedure outlined below is designed to detect errors and avoid costly mistakes Be sure to follow the test procedures in the order described ...

Страница 18: ... Tests 1A 1B and 1C is to make sure that the soldering work of the power supply network is good This is done without installing any ICs on the sockets Do not insert U2 through U8 Do not apply any power to the circuit Set your Digital Multimeter DMM to beeping continuity test or resistance measurement Pick a ground signal for example the negative pin of C1 Measure the continuity to every test point...

Страница 19: ...ontinuity 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 No power should be applied U1 VO pin U2 pin 14 U3 pin 14 U4 pin 16 U5 pin 16 Q1 Q2 pin E R5 R10 R12 R13 R15 SW1 ...

Страница 20: ... this test we want to make sure that power is properly reaching all IC sockets and there is no short circuit of the power supply network Do not start this test if Tests 1A 1B or 1C have not passed Disconnect power from the power jack Do not install any ICs U2 through U8 Use a DMM to measure the resistance between pin 14 and pin 7 of U2 It should be about 4K Ohms This is from the internal resistanc...

Страница 21: ...suring 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 supply You are ready to energize the ICs Tests 2A and 2B verify the two oscillators of LM556 ...

Страница 22: ... Adjust VR2 to change the buzz tone and sound volume to the desired level A piezo buzzer has resonance frequency ranges depending on its physical construction You will notice that certain frequencies near resonance produce louder sound output If the oscillator is not working check VR2 R13 R14 C7 C8 and Q3 Also check the voltage at pin 10 of U2 It should be near 5 0V for the buzzer oscillator to wo...

Страница 23: ...V check the bypass lead on U3 socket Check pin 14 of U5 socket You should get identical signal since the two pins are connected together Figure 4 Oscilloscope waveform of counter clock in Test 2B Test 2B without oscilloscope Without an oscilloscope you can measure the DC level of the clock signal This can give you some indication of the oscillator output although it is not as reliable as an oscill...

Страница 24: ...s test we want to verify the operations of the CD4017 counters U4 and U5 Disconnect power supply and insert U4 and U5 Do not install U3 U6 U7 and U8 Install a bypass lead between pin 2 and pin 14 of U3 socket Apply power and observe the waveforms at pin 14 and pin 1 of U4 with a two channel oscilloscope You should see a 5Vp p pulse at pin 1 for every ten clock cycles of pin 14 as shown in Figure 5...

Страница 25: ...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 The pulse occurs once every ten clock cycles The waveform is shown in Figure 6 The pulse is very narrow about 1us compared to the clock cycle about 10ms Use the highest clock frequency by dialing VR1 to the lowest resistance ...

Страница 26: ...ply power and measure the voltage at pin 1 of U4 Since the positive pulse only appears once every ten clock cycle the DMM will read near zero voltage when there is no pulse and near 5V when there is a pulse However many DMM voltage reading cannot response fast enough to a short pulse and the voltage reading may not go up to 5V If you see a rhythmic rise and fall of the voltage reading with the low...

Страница 27: ...peat the same test for the corresponding signal pins of U5 The sync pulse at U4 pin 15 is too short and cannot be checked with a DMM The DC voltage level is near zero when measured with a DMM Test 4 Counters and LED drivers ULN2003 This test checks that the counting pulses at U4 and U5 are driving LED0 LED19 properly Disconnect power supply and insert U6 U7 and U8 ULN2003 U3 is the only IC not ins...

Страница 28: ...nly one rotating light spot on LED0 LED19 even though the two counters are working simultaneously If you still see two light spots check Q1 Q2 R3 and R4 If you press SW1 the light spot should stop for about 2 seconds and then resume running If counting is not stopped check SW1 R1 R2 and C3 LED20 should be lit when the counting is momentarily stopped If not check R5 and the signal path from U3 pin ...

Страница 29: ...If you concluded this test you have completed the electronic construction of the project Figure 8 All wiring completed and ICs installed ...

Страница 30: ...nts should be connected and have near zero resistance Test 1C IC output pins shorted to power or ground No power supply Fig 1 U2 pins 5 9 U3 pins 1 2 12 13 U4 U5 pins 1 2 3 4 5 6 7 9 10 11 12 U6 U7 U8 pins 10 11 12 13 14 15 16 All test points should not have near zero resistance to GND All test points should not have near zero resistance to 5V Test 1D IC socket power supply Fig 2 U2 pin 7 pin 14 U...

Страница 31: ...counts at Carry Out pin 12 of U4 and U5 Logic low for the remaining counts 1us pulse at U4 Reset pin 15 Test 3 without oscilloscope Fig 5 U4 pins 1 2 3 4 5 6 7 9 10 11 12 U5 pins 1 2 3 4 5 6 7 9 10 11 12 0 5VDC at each Q0 Q9 output pins 2 5V DC at Carry Out pins Test 4 Counters and LED drivers ULN2003 Fig 7 N A Two LED light spots one for LED0 LED9 another one for LED10 LED19 VR1 can adjust LED li...

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