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ARRL ETP Solder 101, Construction Manual

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ARRL ETP Solder 101 24-Hour Clock Kit Construction Manual

A Functional Approach

Parts Inventory

Cross-check the parts against this parts list. Note the resistor color codes, 
especially the 10K (brn-blk-org) and 1K (brn-blk-red) resistors, which may 
be difficult to tell apart. (Use good lighting and a magnifier.) Use care to 
correctly identify the 78L05 voltage regulator, which is similar in 
appearance to the 2N3906 transistors. The 0.1µF and 10pF capacitors may 
also look very similar.

QTY

Description

        

 

❒

1

printed circuit board

           

❒

1

PIC16C54 microcontroller 

[

A

]

           

❒

1

18-pin DIP socket

           

❒

1

78L05 voltage regulator 

[

B

]

           

❒

4

2N3906 PNP transistor 

[

C

]

           

❒

4

7-segment LED

           

❒

1

1N914 diode

           

❒

1

4 MHz crystal

           

❒

4

10pF capacitor (100)

 

[

D

]

           

❒

2

0.1µF capacitor (104) 

[

E

]

           

❒

8

220 ohm 1/4 W resistor (red-red-brn)

           

❒

3

750 ohm 1/4 W resistor (vio-grn-brn)

           

❒

4

1K ohm 1/4 W resistor (brn-blk-red) 

[

F

]

           

❒

4

10K ohm 1/4 W resistor (brn-blk-org) 

[

G

]

           

❒

3

SPST pushbutton switch

           

❒

1

3-AA cell battery holder

           

❒

1

vertical power jack, 2.1x5.5 mm

           

❒

1

2-56 1/2-inch screw

           

❒

1

2-56 nut

           

B

A

C

D

E

F

G

Summary of Contents for ETP Solder 101

Page 1: ...the 2N3906 transistors The 0 1µF and 10pF capacitors may also look very similar QTY Description 1 printed circuit board 1 PIC16C54 microcontroller A 1 18 pin DIP socket 1 78L05 voltage regulator B 4 2N3906 PNP transistor C 4 7 segment LED 1 1N914 diode 1 4 MHz crystal 4 10pF capacitor 100 D 2 0 1µF capacitor 104 E 8 220 ohm 1 4 W resistor red red brn 3 750 ohm 1 4 W resistor vio grn brn 4 1K ohm 1...

Page 2: ...ury A good technique is to hold the lead with your fingers while you clip the lead off just at the top of the volcano shaped joint Work in a well lit well ventilated workplace Use an appropriate soldering iron and tip Use only small gauge rosin core solder Preparation optional The hole spacing of the resistors in this kit is 0 4 inches If you have a lead bending tool you can pre bend all of the re...

Page 3: ...05 voltage regulator Don t force the capacitors too close to the board but don t leave them standing with long legs either Solder all leads and clip off any excess Install the 78L05 voltage regulator Don t confuse the voltage regulator with the 2N3906 transistors The voltage regulator and its outline on the board both have a flat side which should be aligned Push the voltage regulator into the hol...

Page 4: ...hes match up Hold the socket in place flush against the board and solder two opposite corner pins The socket should be flush against the circuit board If it isn t re melt the solder on the pins you tacked while pressing down on the socket with your finger When the socket is flush against the board solder the remaining pins of the socket You will install the integrated circuit itself later Notch Ta...

Page 5: ...red red brn at the indicated locations flush against the circuit board Solder and clip the excess leads Install four 1K ohm resistors brn blk red at the indicated locations flush against the circuit board Solder and clip the excess leads 1K ohm resistors 220 ohm resistors ...

Page 6: ...ing pushbutton switches have four pins Turn the switches so the pins stick out on the right and left of the switch and install them in the indicated locations If you have to force the switches to get the pins into the circuit board mounting holes you might have the switches oriented incorrectly Solder two pins at opposite corners of each switch and check that each switch is flush against the board...

Page 7: ... colon separating the hour and minute digits on the display Pretty clever huh Install four 7 segment LEDs as indicated on the board Remember the third LED from the left is installed rotated 180 from the others Don t force the LED pins into the mounting holes Mount the LEDs by tack soldering opposite corner pins as you did with the IC socket Press on each LED as you heat the tacked pins to ensure t...

Page 8: ...y have a flat side and that the component outline also has a flat side Install the transistors in the indicated locations so their flat sides face the same direction as the flat sides of the component outlines Carefully press down on the transistors until they are approximately 1 8 inch above the top of the circuit board Tack solder the center lead of each transistor straighten the transistor and ...

Page 9: ... The IC socket also has a notch at one end as does the component outline on the board When you insert the PIC into the socket make sure the notches are all pointing in the same direction Carefully place the PIC in position and check the orientation of the pins relative to the socket Once you are satisfied that the pins and socket line up press with both thumbs to rock the PIC into the socket Once ...

Page 10: ...ircuit board surface If necessary re melt the solder joint while applying light pressure to properly seat the connector When it is flush completely solder the other two pins You do not need to completely fill the mounting holes of the power connector but be sure your solder wets both surfaces and forms a smooth shiny joint This is a very common point of failure for circuit boards STOP HERE FOR DAY...

Page 11: ...y holder from the solder bottom side of the circuit board Before you solder the battery holder leads use the 2 56 screw and nut to fasten the battery holder to the back of the PCB Do not over tighten the nut or you may damage the screw battery holder or both Solder and trim the battery holder leads from the component top side of the board ...

Page 12: ... want to see the seconds displayed Once released the time display returns to normal hours and minutes format Final Set up and Operation Disconnect the wall wart from the outlet and install 3 AA cells in the battery holder Install the batteries using the correct polarities as indicated in the battery holder The clock should start operating on batteries but the primary source of power is the wall wa...

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