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Recent content by ajaxoftherockies

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    Motion detection with a twist (...or a point...)

    Thanks, Brad. I'll give that a try and see what I can get. = a =
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    Motion detection with a twist (...or a point...)

    Hi all, I would like to build a box that uses a motion detector, a servo and, I would guess, an Arduino. Simply stated, I would like to servo to move a pointer in the direction of the motion. F'rinstance, if you walked up to it from the right, the pointer would swing right and point at you...
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    Need to find replacement probe for HP 1740 scope.

    Hi all, hope this is okay in this forum; could not see a more appropriate one. Might be my greenhorn showing. Anyway, I have an HP 1740A scope and someone(thing?) walked off with my probes. Would someone here know where I could find replacement? searched Google and all the probes I found...
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    how to drive multiple transistors with same signal

    Thanks for the Mosfet suggestion. Do you have a part number for such a device? (not that i won't do my own search, just askin') On my existing circuit, the LEDs are high-power ones on a Luxeon module; they draw around 800ma each and it is running just fine - no blown LEDs. I'll look into...
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    how to drive multiple transistors with same signal

    I have a working circuit that has three separate signals processed from an audio input. The output signals drive a tri-color LED at about 700ma per color. Each color/LED is driven by a TIP120 transistor. (schematic below shows three signal inputs on R23 R25 and R28 that drive the TIP120s)...

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