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  • Peter_Pan commented on taifur's instructable Convert $2 LED Lamp to $50 Smart Lamp8 months ago
    Convert $2 LED Lamp to $50 Smart Lamp

    Thank you so much! In this one project you've taught me so many things. Even if I never build this, I now know (1) how their inner circuits are (2) How easy arduino programming can be, (3) how easily a blue tooth module can be added to a design, and (4) a great shortcut to creating a basic android app.

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  • Peter_Pan commented on Peter_Pan's instructable A Flicker Free Fix for LED Holiday Lights10 months ago
    A Flicker Free Fix for LED Holiday Lights

    With just a diode, at least on the cheap sets I'm working with, the LED set will light with only on one polarity. That proves that the sets already either have just one diode, or have managed to build reverse blocking diodes into the lamps (the lamp sockets are polarized, btw).. I suspect if the manufacturer used a full wave bridge it would not be so annoying to look at, because the LEDs operate down to a very low voltage. So in that case the flickers would be 2X as fast, but the on/off duty cycle would still likely be well over 80% (on to off ratio). But because these LEDs are completely off 60 or 50 times / second, it can be visually annoying. As to seeing more flash after I add more lights, unless you are saying this based on trying it out and seeing the result, you really shouldn't...

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    With just a diode, at least on the cheap sets I'm working with, the LED set will light with only on one polarity. That proves that the sets already either have just one diode, or have managed to build reverse blocking diodes into the lamps (the lamp sockets are polarized, btw).. I suspect if the manufacturer used a full wave bridge it would not be so annoying to look at, because the LEDs operate down to a very low voltage. So in that case the flickers would be 2X as fast, but the on/off duty cycle would still likely be well over 80% (on to off ratio). But because these LEDs are completely off 60 or 50 times / second, it can be visually annoying. As to seeing more flash after I add more lights, unless you are saying this based on trying it out and seeing the result, you really shouldn't assert it as being true. I've so far added even more sets, and there are now 600LEDs total. And, I have even switched to a 25watt "ballast" lamp, which means more current/brightness than my original 4W lamp provided, because the lamp resistance is lower. All that aqnd I'm still not seeing a bit of flicker. This makes sense. In my initial bench experiments I used a 30uF motor start capacitor with multiple 100 LED sets, and even that was adequate to solve the flicker problem.That was a large non electrolytic cap. By using an electrolytic, I was able to triple the capacitance in a much smaller package, for even better filtering. Looking at the loaded output waveform on a scope, you certainly see the ripple voltage. But even the minimum DC level on the waveform is far from the point where you'd cause the LEDs to go out, or even dim significantly.

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  • Peter_Pan's instructable A Flicker Free Fix for LED Holiday Lights's weekly stats: 11 months ago
    • A Flicker Free Fix for LED Holiday Lights
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  • Peter_Pan commented on Peter_Pan's instructable A Flicker Free Fix for LED Holiday Lights11 months ago
    A Flicker Free Fix for LED Holiday Lights

    Thanks! And its had some unexpected benefits too! Using the 4 watt (smallest i could find) lamp, the LED brightness is a nice "mood lighting" level, but then i can screw in a higher wattage lamp for a brighter glow during the Holidays. The wildest thing is if you disconnect power, the LEDs will dim, but continue to glow very dim for a very long time, just off the residual capacitor charge.

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  • Peter_Pan commented on DJJules's instructable Build the Mini Line Array11 months ago
    Build the Mini Line Array

    Just sharing the one I built.Mine has a bit of a different purpose, a mono system mainly designed to produce clear and well projected highs (150 hz and up) for a performance system, allowing a separate floor speaker to handle the lower register. I learned a great deal from your article as well as many others on line, so I'm sharing mine wherever i can. I am very happy with the way mine turned out, and it has been a major improvement to my sound as a solo performer. http://elfintechnologies.com/LineArray.html

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  • Peter_Pan commented on DJJules's instructable Build the Mini Line Array1 year ago
    Build the Mini Line Array

    What are your thoughts on (1) angling the speakers in the horizontal plane, to offer more coverage side to side, and also (2) scaling different combinations of serial/parallel connections, so that the center and upper speakers get more of the available power?

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