ASCEL Electronic AE20125, Assembly And Operation Manual

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3 Diodes
The circular band on diodes identifies the cathode (negative
terminal). The bar depicts the cathode in the symbol. The
positive terminal is called the anode.
Diodes are mounted horizontal. Try not to heat up the body of
the diode while soldering.
4 LEDs
LEDs (light-emitting diodes) must be soldered with respect to
the correct polarity as well. The cathode is identified by the
short lead and the larger electrode inside.
9