Be default, the older model of DSP card support PWM mode power supply only. I have make a request that all DSP sent to me since May must capable to support both type PS; analog and PWM. In case you have one that doesn't support an analog PS but need to, please download the docuement and following the procedure to upgrade it.
FYI, most power supply come with the small Chinese laser machine "K50" is an analog. The PWM signal from the DSP is not going to control the fire properly. You have to install the circuitry to enable analog output.
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