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  1. B

    How to power a phone with no battery

    Why not leave it as it is and connect to the charger that came with it. I cannot think of any "various understandable reasons" but perhaps you could supply them. There may be other work-arounds.
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    Which End Normally Has Power?

    Best advice one could give is, 1.....don't mess with anything live and 2..... If mains level, go to advice note 1 and get a lecky.
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    Trying to fix an old record player.

    Chances are the motor is quite ok . The fault may be more to do with the speed regulator which I suspect are the two yellow wires and some additional circuit within the player. It would be what is commonly known as " feedback" to keep the speed at a constant setting. Output pully appears to be...
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    Which End Normally Has Power?

    Which connectors and which conventional theory? No idea to what your heading refers.
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    Solution required for Relay burning issue

    Voltage surges and lightning hits are two entirely different situations. By the look of your boards, the latter is obvious. Local supply authorities generally provide some lightning suppressors in some countries but any good lightning protection system is going to cost way in excess of a couple...
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    Illuminated push to make switches

    Perhaps a better photo of what you are after would help. What I could see was "push to make and illuminated perspex type"
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    Illuminated push to make switches

    Many and varied types on Ebay. Below is an example http://www.ebay.com.au/itm/5V-12V-Mini-Round-Lit-Illuminated-Arcade-Video-Game-Push-Button-Switch-LED-Light-/400999317983?var=&hash=item5d5d6c01df:m:mNJ2yMm5Y9xnF6hLYhwpXGQ
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    Op amp unexpected results

    Draw your circuit. Fritzing is simply a waste of time.
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    5V One Channel 1CH IR Infrared Wireless module.

    Show us the unit , preferrably some specs/link as well. No one has a crystal ball that shows any unit.
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    Lamp step control

    Most of the cheaper PIR sensors for security lighting have a switching sequence similar to what you describe although it may not suit your needs and would have to be hacked. Sequence there is power on and unit goes to auto ( which is a timer mode) power off and on again within 1 second and unit...
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    Help finding the right battery

    Be aware that some batteries may not deliver the rated capacity. Also, the terminal voltage reduces as it discharges. Charts for this should be available online from battery manufacturers.
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    Wireless key fob and USB receiver. Advice sought

    I think there is a lot more to the requirements here than you seem to be aware. Just as an example. What happens if they all ( or one or whatever) enter or leave by one door at one time.
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    Lenco 600 Transformer identification

    Operating voltage is in no way a reference to output power on it's own.
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    Control for Lamp Circuit Using Low-voltage Push-on/off Button

    Whose location?
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    Control for Lamp Circuit Using Low-voltage Push-on/off Button

    Low voltage part ie flip flop with switches, some form of lv supply and relay should be straightforward. Eventually you will have to engage a licenced electrician to install a feed and make certain the mains and low voltage are adequetly isolated from eachother. The latter I would imagine, would...
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    Extreme High Temperature Measurment

    I do my own castings for the miniature 4 stroke engines I build and to me, any temp measuring device would just get in the way and create a safety hazard. I use a high kw gas burner and firebrick enclosure with the appropriate crusibles and clamps for dispensing. Never found precise temp of the...
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    Help needed with reversing sensors please

    Could find a hall effect split clamp sensor for dc that would monitor reverse lamp current or use an ldr to monitor the lamp but as mentioned, any changes will be "invasive" to some extent. USS Enterprise sensors not available just yet.
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    Help needed with reversing sensors please

    No need to do either.
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    Help needed with reversing sensors please

    Sorry, no idea what you mean about sensor current and also "fault". Reed activation is from magnetic field set up from reversing lamp current.
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    Help needed with reversing sensors please

    Get a bit of enamelled copper wire, maybe about 18 gage. Wind about a dozen turns around a glass reed switch( may need more depending on bulb current) cut into the reverse cable and solder the winding part in series. Use reed switch via a transistor or mosfet to turn on the new device. I'd...
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