User manual

Figure 60: The finished circuit
4.17 Checking Circuit and Shortening Excessive Lengths
Before taking the circuit into operation, check by way of visual inspection that all compo-
nents are correctly installed and that no solder points were forgotten. Now shorten the ex-
cess lengths of the component connection wires with an electronics wire cutter.
Leave about 1 mm of excess length at the back of the PCB. If you equipped the PCB from
the rear and the connection wires stand out over the coated side of the PCB, shorten them
so that they protrude over the solder cones by 0.5 - 1 mm. If you have to de-solder a com-
ponent to install a different one, the connections are still long enough to handle them
well.
The circuit must not be taken into operation before the excess lengths are removed. Press-
ing both wire ends together and thus closing the switch will make the green LED light up
very weakly, the red one brightly. You can see how the transistor amplifies current. You in-
stalled everything correctly.
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