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LED’s
These perform like other diodes except that the glow when a current passes through them.
Their position on the PCB will be shown like this
The LED will also have a flat side.
Generally, the rule would be to match the two and most of the time that is what you will do.
However, to save you de soldering your
LED’s I recommend testing them with a multi meter (set to
diode test mode) to be 100% sure you are connecting the positive side where it needs to be. On the
example above the positive feed goes into the round side.
I have come across
LED’s orientated opposite to what I expected previously, after installation… so
this quick test is sensible and is one less thing to debug later on. Check twice…solder once.
There are three 3mm leds which mount to the main pcb. I highly recommend that these are added
after everything else, so after the pots and toggle when we get to that stage.
They are quite fiddly to add, and fit to the case, so take your time and remember to keep taking
deep breaths! Its probably easier to solder them one they are through their respective hole, giving
yourself plenty of freedom with adjustments.
The Crystal
The crystal will look like this. A small silver
cylinder with two legs. It is non polarised
which means it does not matter which leg goes
in which hole.