Fully-detailed instructions for assembly and test of the PIC-EL Kit.
Section 6: DIODES
Diode orientation is very important and polarity is indicated by the dark band on the body denoting the cathode. This end with dark band must be inserted in the pcb hole with the band indicated closest to it.
First insert the larger diode D5 (12V zener 1N4742) at the proper position in the board. This component's leads are slightly heavier/thicker than those of the other diodes, so you should easily pick it out. Note that the pcb holes for D5 are correspondingly larger than those for the other diodes. Bend the leads at 90-degrees, being careful not to stress the glass body of the diode, insert it onto the pcb, solder and clip the excess lead lengths.
Next insert the remaining four smaller diodes D1-D4 (1N4148) at their positions on the pcb. Bend the leads at 90-degrees, being careful not to stress the glass body of the diode, insert it onto the pcb, solder and clip the excess lead lengths.
Make a last check for proper orientation of the diodes on the board. Ensure that the bands on the component are aligned over the bands on the corresponding silkscreened layout. If any of these diodes are inserted backwards, your PIC-EL board will not fully work.
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Page last updated: Feb 4, 2004