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21.M197-Twilight Switch 12 - 28 V/DC
22.M094N-Marten repeller
23.M062-Mini-Fence-High-Voltage Generator
24.Z100-Marten Repellent Spray
25.B093-Electronic dice
26.M161-Ultrasonic Power Cannon
27.M032N-Amplifier 12 W, universal
28.M031N-Amplifier 3,5 W, universal
29.M071N-Ultrasonic vermin repeller
30.G023N-Case With Fastening Straps approx. 74 x 51 x 28 mm
31.L100-Conductive Silver
32.M113A-Time switch 12 - 15 V/DC
33.M158-Water Switch 9 - 12 V/DC
34.M122-Twilight switch 12 V/DC
35.E011-Experimental board, strip grid
36.M048N-Ultrasonic Generator
37.M069N-Underground mole & vole repeller
38.M174-Solar charging regulator Dual 16 A
39.M128N-HF Detector (Mini Spy Finder)
40.M012-Power Control 110 / 240 V/AC, 1200 VA
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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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