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    Lightweight Electronic Spark Ignition for 2 cylinder engine

    The rotating point, as you put it, when used in conjunction with a hall effect switch is indeed a small magnet, The ones I use here are about 3mm dia and 1mm thick. If you are modifying an existing system then you have to be aware that ferrous metal can be a problem for the magnet and it's...
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    Lightweight Electronic Spark Ignition for 2 cylinder engine

    There is no advance /retard on those units.
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    Dummy load needed

    I make it 96w. Calculation is I ^2 R or V * I This site will make it easier for you.................http://www.csgnetwork.com/ohmslaw2.html Just note that a 20w fluro will draw more than 20w.
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    Sound module

    Look for audio amplifier module on Ebay. You may have to go to a higher supply voltage for the 10w though.
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    Help With Draining Batteries

    As Duke says, you will get approx 8amp load out of each 100w auto headlight bulb. Current will change as voltage drops though. If it's a comparison reading over several discharge periods then time record would be fine so long as you drop out the discharge at a given voltage..
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    Low Speed Relay

    air vane and micro switch with a start button over-ride.
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    How to build a dimming flexible light

    A layout drawing would be a big help.
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    Identify Triac from Varilight lighting dimmer switch

    I mostly use BTB08600B triacs. Easy to get, cheap on eaby (handful for a couple of dollars and work ok) Even used them in desklamp touch dimmers.
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    Circuit Design

    Most start with an LED a resistor a switch and a battery. How long is a piece of string comes to mind. Depends on a million things which way you go. This is why it pays to be a bit more specific.
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    24 VAC to 12 VDC

    Just wondering if the Op went for #2 and #21 as suggested.
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    Wireless communication over 1km

    Arduino mesh network.... see here..... http://www.instructables.com/id/Simple-Arduino-Wireless-Mesh/
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    Electronics book

    Plenty of free stuff here..... http://www.talkingelectronics.com/te_interactive_index.html
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    LED Driver Wattage Question

    At the top of the add in your link it says ....40W
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    Step Down DC Buck Capacitor Blow up

    With LiFePo4 Battery, nominal is around 3.2v so maybe 15 cells, makes the top end even worse at 3.8v going to 57V.
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    Parallel and series circuit help

    To start, look up how to add up series and parallel resistance.
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    24 VAC to 12 VDC

    Rectify 24vac and feed into a converter like this ......cosy a bit over $5.00...easy http://www.ebay.com.au/itm/DC-DC-5V-38V-to-3-3V-6V-12V-24V-5A-Buck-Step-Down-Converter-Module-Car-Power-/281871192038?hash=item41a0d50fe6:g:IvoAAOSwie5XS5zU
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    Air actuated switches

    Op is looking at changes in air flow
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    Need help to fix old RC controller

    Good chance that the negative sign (-) on the electrolytic capacitor will be the negative rail. It's the can looking device between D3 and R8. Nice clear photo of the reverse side of the board would help also.
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    Lightweight Electronic Spark Ignition for 2 cylinder engine

    Sure, why not? That's what this is all about here. Might pay to be a bit more precise on just what you require as I outlined above.
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    LED Celling stay glow.Can I stop that?

    They are (in some countries....MEN) but they will get a voltage difference in many instances. To understand this I guess one has to be involved with the trade for many years. Depends on several conditions, a couple being poor neutral connections at point of entry (or other) or poor conductivity...
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