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21.M032S-Universal Amplifier 12 W "Plug & Play"
22.M015N-DC/DC Converter, adjustable
23.M197-Twilight Switch 12 - 28 V/DC
24.Z100-Marten Repellent Spray
25.M062-Mini-Fence-High-Voltage Generator
26.M113A-Time switch 12 - 15 V/DC
27.B093-Electronic dice
28.L100-Conductive Silver
29.M032N-Amplifier 12 W, universal
30.M071N-Ultrasonic vermin repeller
31.M158-Water Switch 9 - 12 V/DC
32.M122-Twilight switch 12 V/DC
33.M174-Solar charging regulator Dual 16 A
34.M031N-Amplifier 3,5 W, universal
35.E011-Experimental board, strip grid
36.M048N-Ultrasonic Generator
37.Z101-Scent marks remover
38.M168-Overvoltage Protection 12 V/DC
39.M128N-HF Detector (Mini Spy Finder)
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Soldering course - page 13

Picture of a cold soldering joint

The soldering joint on the far right is clearly a so called "cold soldering joint". (arrow) . The solder applied only to the wire not the land. The difference to the surrounding soldering joints is obvious.

REASON: Only the wire was heated; not the land.

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soldering presentation shortform

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