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Step 21Build Your Own Step 6 - Diodes and LED
Now insert the diodes. Make sure you put them in in the right directions - diodes are polarized, and the circuit won't work if you put them in backwards (see picture for reference - the black ring indicates the negative end). Diodes are also sensitive to excessive heat, so try to solder them quickly and then immediately remove the soldering iron again.
The power indicator LED (light emitting diode) - between the two blue screw terminals - should be placed if you plan to use the scope without enclosure. Otherwise leave this connector open or put in a jumper header (like shown in the picture) so you can later hook up a panel-mounted LED. Again, the LED is polarized so you'll have to insert it the right way around (see "+" label; the LED's "+" pin is the longer one).
The power indicator LED (light emitting diode) - between the two blue screw terminals - should be placed if you plan to use the scope without enclosure. Otherwise leave this connector open or put in a jumper header (like shown in the picture) so you can later hook up a panel-mounted LED. Again, the LED is polarized so you'll have to insert it the right way around (see "+" label; the LED's "+" pin is the longer one).
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