Arduino Laser Show with Full XY Control by nothinglabs
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Step 19: Connect Galvos to Transistor Collectors

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Connect the positive speaker terminal (indicated with a "+") of the X galvo to the "collector" lead of the X transistor using 20 gauge hookup wire and your soldering iron.

The collector is the middle lead on the transistor.

Again - use a fairly long length of wire.

Tip: Applying a thin coat of solder to the tips of the connecting wires can help prevent them from unraveling and causing shorts.

Repeat this step for the Y transistor and Y galvo.
 
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