Elektor TAPIR Manual de construcción - Página 10

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'extend' the tip. Place the TAPIR on the bench with PCB 4 facing down and

solder the Cinch panel mount connector and PCBs 5, 6 and 7 to PCB 4.

Figure 17. PCB 4 fitted to the others.

Next, fit PCB 2 in the same way as PCB 4. The tabs of PCBs 5 and 6 must

fit accurately in the notches. Press everything firmly together and solder

the Cinch connector end and the switch end. Check once again that

everything is properly mated and correct this if necessary. If everything is

as it should be, solder the seams between PCBs 2, 3 and 6, and between

PCBs 2, 3 and 6. Place the TAPIR on the bench with PCB 2 facing down

and solder the joints between PCBs 5, 6 and 7 and PCB 2. Check that all

of the solder joints have been soldered and no short circuits are formed,

especially where PCB 2 and 6 meet.

Figure 18. PCB 2 fitted and soldered to the others.

Figure 19. Don't forget to solder the

positive supply rail connection from PCB2 to PCB6.

Elektor "TAPIR" E-Smog Tester Kit | Construction Manual

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Finally, solder the two M2x6 standoffs at the indicated locations on PCBs

5 and 6. Ensure that they are flush against the board and exactly in the

middle. Hold them in place with clamping tweezers if necessary. If you

have a steady hand, you can also use a screw temporarily threaded into

the standoff. It might help to put some solder on the side of each standoff

to be placed against the PCB. It takes a little effort to get the solder

flowing evenly on the standoff. Remove excess solder before soldering

the standoff onto the PCB

Figure 20. The two standoffs soldered securely.

Remove PCB 1, countersink the mounting holes with a sharp drill bit, and

check that the cover fits properly and can be screwed in place. Now fit

the small spring and then insert the battery as shown on the PCB. The

spring can be soldered in place if necessary. Now you can place the lid on

the TAPIR and screw it tight.

Figure 21. Showing the battery spring soldered, and the two holes countersunk

to take the 2 mm screws.