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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. 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.

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Содержание 2161431

Страница 1: ...gered 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 f...

Страница 2: ...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...

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 c...

Страница 4: ...all 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 enclosur...

Страница 5: ...ransistor 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 2N390...

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: ...lerance 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...

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...

Страница 12: ...n 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...

Страница 13: ...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 atte...

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

Страница 15: ...al 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 proble...

Страница 16: ......

Страница 17: ...s 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 procedu...

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...

Страница 19: ...ntinuity 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 p...

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 Disc...

Страница 21: ...uring 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 se...

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 n...

Страница 23: ...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...

Страница 24: ...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...

Страница 25: ...6 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 Figur...

Страница 26: ...ly 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...

Страница 27: ...eat 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 Co...

Страница 28: ...ly 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...

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: ...ts 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...

Страница 31: ...ounts 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...

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