varying voltage

  1. B

    How to supply power to a diode or laser pointer for a laser and be able to vary the voltage?

    Hello! I am a student working on a portable laser project. The laser is going to be powered by two lithium-ion batteries at 3.4A capacity and 3.7 Nominal voltage (4.2 charging voltage cut-off and 2.5 discharging voltage cut-off). I'm using voltage regulators to step up or step down voltages for...
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