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    Peel-off paper sticker circuit?

    Hi, I'm attaching image file of this peel-off paper sticker circuit (Image URL option from menu shows red X in post Preview, despite working link). What is this and what would it be used for? Thanks
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    555 on/off circuit for 5v motor (w/ schematic)

    This PWM experiment has 6v coming out of NPN emitter (when "on"), which powers a 3 -6v mini water pump. Circuit works, but I want less "on time", and more consistent cycle, as compared to LED output, which is pretty consistent. I've changed values of capacitors/resistors, and the cycle varies...
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    Magnet Alarm Circuit Board, Battery Power

    This 4.5 V (3 x 1.5 V in series) magnet window/door alarm has 1 internal and 1 external magnet, a Reed switch, and piezo speaker. I've swapped out speaker with blue LED and that works. But when I change battery power to 3 V button cell (which powers LED independently) or 9 V (or even two 9 V in...
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    ID Components on Video Camera Circuit

    Hi, I'm interested knowing about components on mini video cam and external battery attachment. I can ID video cable, mic, micro SD slot, internal battery. Please ID components that correspond to numbers I've listed on photos. front-cam.jpg shows front of camera circuit board. #2 is a hard blob...
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