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    restoring old garage door opener-receiver/transmitter

    Your 3rd link is a latch type which would, I imagine, be unsuitable. Garage openers are usually momentary contact which means one pushes a button to get a relay to change state, then on release, the relay returns to original state. This is why I went to the trouble of looking up what I imagined...
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    The components of a mood lamp

    1, Your photos do not show. 2. One does not need to know any detail of electronic design if one is hiring a designer, a basic idea is usually enough. 3. No such thing as a 1 amp resistor. 4. Direct connection to mains is a very broad query. In some instances it is dangerous, in others it...
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    Momentary power supply for doorbell

    I usually simply knock on the door if the bell doesn't work.:)
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    Zener Voltage Regulator to power Arduino

    If you are in to making things, fine. I tend to use these ready made....... either adjust to whatever level OR.....solder a link on the back for pre-set level Small , cheap and they work. Only 1-note, I tend to put a disconnect link in between the unit and Arduino during programming, some...
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    restoring old garage door opener-receiver/transmitter

    One can usually program many of the available units for whatever switching action one requires. As an example push on, push off or......... push on , release off Some Ebay have the example programming below in datail, others have it included all-be-it in Chinglish....others have details on...
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    Color coded rotary encoder

    No spec sheet there that I can see. Just assuming it is a pot with an extra pin for centre tap, maybe for some extra control within the amplifier. When the # number is clicked on it says it is a linear 10K pot so if that is the same as the unit you have, then I'd say you are in business...
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    Restoring ancient digital watch.

    I remember those things...had to find a shady spot to see the display and took 3 hands to operate the buttons.
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    Color coded rotary encoder

    Mechanical rotary encoders are switch contacts, no resistance involved. Perhaps you mean it is a pot with a push switch mechanism. A link to the device would be helpful to confirm.
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    Measuring current draw from permanent +12v

    It could be the mirror motors operate via a relay and also most automotive switching is earth return switching. Point being not much point running extra 12v positive to the motors.
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    Can I use 78l05 replace lm2931?

    Either might get a bit hot under the collar with such a large voltage difference. Cannot see why you need low dropout, perhaps it is simply physical size. I'd be getting a much lower power in supply like 6V to use either of the ones you quote.
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    Light when you don't need it and no light when you do.

    Good that you found some direction to work with. However when I refer to elcheapo, it does include anything in the range you've mentioned. Good ones in Aus are the Clipsal range and start around Au$120.00. That said, you can expect some service from the elcheapo's otherwise they would have...
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    Fluorescent lamps in series using electronic control gear?

    There used to be twin series 20W fluro tubes controlled via 1 40w ballast and 2 starters of a particular rating (P2 if I remember correctly) However, you are dealing with an entirely different kettle of fish here in that electronic ballasts are 4 wire ( 2 to each heater at each end of the tube)...
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    Light when you don't need it and no light when you do.

    Some of your comments are a little difficult to follow however as an example there are these on Ebay and possibly elsewhere as well. They can be used in any AC mains voltage range from 90 to 220v so that should cure one of your problems. I doubt they will cover 180 degrees even though it is...
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    Light when you don't need it and no light when you do.

    Most of the elcheapo sensors will have a daylight adjustment so that lights will only activate at night or after the preset light level adjuster setting. They also may have a sensitivityadjustment which is self explanatory. Most include a timeout adjustment which is rather difficult to pin...
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    PWM motor noise getting into audio

    Use optocouplers with NO common ground connection.
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    Name of "through PCB IC socket rows"

    https://www.ebay.com.au/itm/2-45mm-Pitch-40-Position-Single-Row-Round-Male-Pin-Header-5-Pcs-A7P9/192971346579?epid=1253288620&hash=item2cedfd1293:g:ujUAAOSw94ddGlml&frcectupt=true
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    Charging a battery from well pump circuit (cycles on/off 120v)

    I would have imagined the control for the pump on/off would be located adjacent to/ if not actually on the pump motor itself (if not submersible for the latter). In which case there should be unswitched power available there.
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    Charging a battery from well pump circuit (cycles on/off 120v)

    Maybe place a standard mains flood light at the 230v location. The light will be quite capable of shining 10 ft or more if the correct lamp is selected. Not difficult to include an LDR there also.
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    Shock from arduino

    If (both) then there would be a dead short on A and N.
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    Shock from arduino

    Hi Hop, If they are core balance relay driven, (which most I have seen are) then yes. The A and N conductors are taken through a toroid core and if not balanced ( usually within 30mA) as in the case of any current flow to earth then the unit will trip. I think even in most "crazy wiring"...
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