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21.M172N-Bicycle Power Charge Controller USB
22.E011-Experimental board, strip grid
23.M152-Rain Sensor 12 V/DC
24.L100-Conductive Silver
26.M168-Overvoltage Protection 12 V/DC
27.M012-Power Control 110 / 240 V/AC, 1200 VA
28.M169A-Temperature switch-thermostat 12 V/DC
29.B093-Electronic dice
30.M158-Water Switch 9 - 12 V/DC
31.M113A-Time switch 12 - 15 V/DC
32.M094N-Marten repeller
34.M091N-Phase Coupler for Power Line Products
35.M202-Lead-Acid Battery Activator / Refresher 12 V
36.M040N-Universal preamplifier
37.M128N-HF Detector (Mini Spy Finder)
38.A001-Bending device
39.M122-Twilight switch 12 V/DC
40.E003-Experimental board - strip grid
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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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