This circuit needs to adapt a PWM/TTL laser module to a 3D printer using a cooling fan output. You need to use a laser which has the PWM/TTL control on a port different from the one used for the power ...
The COM ports can also be reassigned from the options menu of the GUI. The GUI interface allows for turning on (or standby if set to TTL digital modulation) each of the lasers and adjusting the powers ...
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