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Dick Cappels

Dick Cappels is a consultant and writer based in Mesa, Ariz.


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  • Novel Series-Boost Circuit Uses Flying Inductor

    By Dick Cappels, March 15, 2004

    The power supply that's described here boosts the voltage from a 1.5-V flashlight cell to 3.5 V across an LED, while the LED and flashlight cell are in series with the power supply. What spawned this circuit was the need to make an LED retrofit kit...

  • Analog Pink-Noise Source Drives Earphones Or Speakers

    By Dick Cappels, July 21, 2003

    Acoustic white noise is useful as a masking sound to improve privacy in offices, or as a soothing sound field to help concentration and sleep. It has also been said to aid in therapy for people suffering from tinnitus (ringing in the ears). White...