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please read the attached calculation file.
Hello dearAre you talking about HV9910. I will suggest not to use ppm dimming. Use variable resistance already used in circuit, it works verrrrry well.Have you used the same values for the components?Plz check diode in output section it must be ultra high frequency.Also check the LED which you are using.
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HV9910 Universal LED Driver With 220v AC InputView Instructable »
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