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    The LM317 Adjustable Voltage Power Supply kit

    One thing to look out for there is, most laptop supplies are around the 19V DC mark and your 317, if used for 12V is going to have to dissipate that power as heat. Better to have a supply that comes closer to your required output levels plus 317 drop requirements (usually a couple of volts)
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    The LM317 Adjustable Voltage Power Supply kit

    Most pc power supplies are flat giving 12v dc.....then you must consider the output will be lower by the 317 requirements, so you might get 9v if you are lucky
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    The LM317 Adjustable Voltage Power Supply kit

    Get on to the supplier. There should be some kind of instruction sheet provided or a link to download one.
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    Looking for a specific light-activated switch (12V DC)

    Usually in a basic ldr, change position of the ldr with respect to it's voltage divider mate.
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    Logic GAtes

    PNP transistor....??
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    Bonehead connected to the electronics forum

    As above, line referred to active. No positive or neegative in AC thankyou.
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    Bonehead connected to the electronics forum

    Pretty obvious.....line comes from the mains. Load is the active cable going to the load. Neutral is a permanent connection on the other side of the load. There are certain variations on this such as double pole switching on appliances fed via a flex lead. In that instance, one can never be...
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    Simple delay on

    Gotcha.....
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    Simple delay on

    The way I read it, the Op was providing the pulse from another sourceand when this pulse arrived, the magic of the delay was done with the 555. Then again, word decyphering from some sources is not a specialty of mine.
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    Simple delay on

    If you use a 555 there would be no need for transistor on the output as the 555 is quite capable of driving a small relay directly. The 3v pulse may need to be inverted with a transistor to give the correct trigger. Simple enough and plenty of how to out there. Talkingelectronics has books with...
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    Simple delay on

    555.....
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    Capacitor mF vs. uF confusion when replacing

    It has already been explained to you on several occasions, then you go away, half read facts and come back with crazy claims. I'd suggest you quitely retract and re read all the information above a couple of times and see if it sinks in.
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    Repairing a Baby Monitor that Used a Higher Voltage Charger

    Without any experience ( and zero detail on the unit) you are pretty much up the creek without a paddle. That plus most of these devices are simply not made to be repaired, even by somone experienced. Buy a new one and remember not to do the same thing again.
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    Cat collar

    Go directly to jail, do not pass "go" ....do not collect $200.....
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    Capacitor mF vs. uF confusion when replacing

    Have you had the cap tested to determine if it is at fault or not....??? Before being undecided on which may or may not be more suited, it would be the obvious place to start rather than just "assume" it is faulty
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    cameras

    Probably best to say just what it is you have in mind to use the camera for. There are heaps of miniature cameras around , for example the ones used in r/c aircraft etc which are cheap enough to experiment with, will adapt to tx rx systems fairly easily.
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    Need Help About Word Combine Generator

    Something to do with Microsoft Word maybe....never heard of a word generator.
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    2S Li-ion charging module without balancing?

    It's ok. One does not HAVE TO balance charge.
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    matched impedance question

    Hehehehe....yes..mate of mine (Keith) worked in audio and tv for many years and laughed as he told me the story of some bloke who ripped out all his home hifi wiring to be replaced with "oxygen free". Keith said how he was invited around to the rewired house to "hear the fantastic difference"...
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    Can oscilloscopes measure circuits with different voltages at the same time?

    Fine...work it out for yourself then if you know so much. In the meantime, you need a common between the servo and the arduino and chuck that opto isolator...does nothing
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