Nick Orlando

Member Since: June 2, 2011

Country: United States

  • I have worked with Ethan Zonca a lot in applying this circuit for lighting and audio purposes. Keeping this short, I will say I have experienced audio problems with PWM and noise while driving high current LEDs. However, this is easy to fix. The 2.2uF capacitors help offset most of the noise generated by the current limiting switching, which is about 500kHz (well out of audible noise range). To eliminate the PWM noise which is created by line drops from the high current draw it really helps to add some bulk capacitance at the power input of the picobuck. I recommend a 10uF ceramic and possibly even a 20uF or more electrolytic depending on your wiring situation. The longer your power wires, the more bulk capacitance you may require.

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