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21.M197-Twilight Switch 12 - 28 V/DC
22.M168-Overvoltage Protection 12 V/DC
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24.M113A-Time switch 12 - 15 V/DC
25.M122-Twilight switch 12 V/DC
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28.Z100-Marten Repellent Spray
29.M158-Water Switch 9 - 12 V/DC
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31.M031N-Amplifier 3,5 W, universal
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33.M174-Solar charging regulator Dual 16 A
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35.L100-Conductive Silver
36.E011-Experimental board, strip grid
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40.FG016-Exhaust Control
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Soldering

Soldering course - page 14

Picture of a cold soldering joint and a poor connection

In this picture you may see a "cold soldering joint" (black circle) and a poor connection between wire and land (white circle).

REASON: The solder was heated too long. Therefore the flux filling of the solder vaporized and the solder cannot connect with the land.

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soldering presentation shortform

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