Elektor TAPIR Посібник з будівництва - Сторінка 9

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Measure the DC voltage at the upper solder pad of C4 (next to C2, which

is connected to T3 and R4). The reading should be between 0.5 V and

1.0 V. If not, check all solder joints for proper contact and check that all

components have been fitted in the right places.

Figure 13. Measurement of the DC level at the output.

If everything is okay, the final three components can be fitted:

8. D1 (BAT54S; marking: LD3 or WV4 depending on manufacturer)

9. C2 and C4 (10 µF; no marking, large SMD)

Now release PCB 3 from the panel, taking care to avoid damage to the tabs.

Figure 14. PCB 3 removed from the panel.

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

9/15

Then solder the Cinch panel-mount connector

onto the PCB. First, straighten the two ground

tabs.

Remove PCB 5 from the panel and lay PCB 3

on the work surface with the Cinch connector

facing away from you. Place PCB 5 in the proper

position on PCB 3 as well as perpendicular to

PCB 3, with the marking "M2×6" facing the

Cinch connector. For now, solder only the pad

at the bottom right.

Remove PCB 6 from the panel and fit it perpendicular to PCB 3 with the

marking "M2×6" facing you. For now, solder only the pad at the bottom

right.

Remove PCB 7 from the panel and fit it perpendicular to PCB 3. The proper

orientation is clearly indicated by the solder pads. Solder all three pads.

Figure 16. PCB 3 with PCB 5, 6 and 7 fitted.

Take PCB 4 (with the headset connector) and insert it carefully into the

rear piece and down onto the bottom piece, so that the tabs of PCB 5

and PCB 6 fit into the recesses in the side pieces. Press the PCBs firmly

together and solder them in place, starting at the middle. While doing this,

regularly check that the PCBs fit closely together at the bottom — at this

point it's still possible to make small adjustments.

Now solder the joints between PCBs 3, 4, and 5 and between PCBs 3, 4,

and 6. Be sure to solder the joint between PCBs 3 and 4 at the bottom

near the headset connector. If the tip of your soldering iron is too thick

for proper access to these joints, consider using a piece of solid wire to

Figure 15. The RCA phono

connector with two ground

tabs straightened.