1N4148 Diode

1N4148 DiodeDiode Schematic Symbol

Conventional forward current through the diode is from positive on the left to negative on the right, indicated by the black band.  The terminal on the left is the anode and the one on the right is the cathode, often denoted by "a" and "k".
  In the schematic symbol the flow of conventional current is shown by the direction of the arrow, so the top end is the positive anode and the bottom end is the more negative cathode.

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