Velleman KNS130 Manual Del Usuario página 13

4
17
18
100k
11
52
53
10kΩ
9
15
16
100Ω
7
Complete all wiring connections as indicated in the sequence. Switch on the main switch. The electric
current from the batteries will pass through the 100KΩ resistor to light up the LED. The LED will light up
very dimly, or apparently not light up at all. Press the push switch. Now one more path is available.
Though there is a 10KΩ resistor in this path, this is still an extra path for the current to flow through.
Therefore more current will flow through the LED and make it light up more brightly! Do not release the
push switch. Access the reed switch with the magnetic pole. Now one more extra path is also available!
There are total 3 paths for the current to flow through now and so the LED will light up brightly! Though
this time there are also 3 resistors in the circuit, the LED lights up brightly. The resistors are in parallel
connection so this causes a different result.
12.7 Function of the touch plate
Wiring Sequence
4-49, 48-29, 28-17, 18-3
48
29
28
17
Complete all wiring connections as indicated in the sequence. Switch on the main switch. Dampen you
finger with water and touch the touch plate. The LED will light up very dimly. This indicates water has a
large resistance and so only a small amount of electric current is able to pass through. If you put a drop
of salt water onto the touch plate, the LED will light up more brightly! This is because salt water is a
better conductor than plain water, and thus more current can pass through.
12.8 A simple demonstration of a function of the PNP transistor
Wiring Sequence
4-23, 24-49, 22-29, 28-48-17, 18-3
V. 01 – 01/02/2024
3
48
49
Ω
12
10
8
49
4
3
18
KNS130
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