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  1. B

    Over and under AC voltage protect circuit

    Go and see your local supply authority or local electrician. That range of voltage swing means something is not right.
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    How to control the field current of an alternator by using PWM?

    B terminal is the main battery connection. What type of alternator do you have. Most these days have an internal regulator. If an older type with external regulator, field regulation is through 1 and 2 via an external regulator designed for the job, no pwm required anywhere.
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    Ardiuno voltages - Beginner

    Thanks Steve, I stand corrected. Trouble is many times when one reads entries on the forums, some come up with figures that support my statement, and they are well known pro's at the game too. Still, overall it seems a bit over the top to want to supply a uc with 12v when it mostly runs on 5v...
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    Power button circuit seems dead (Android tablet). How to check it?

    Voltage does not sound right. What is written on the batteries and what connection.
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    Ardiuno voltages - Beginner

    Arduino have a "raw" input that will take up to 12v. Either use nicads or nimh as dry cells will go over this level when new and arduino will be damaged. I'd be investing in a smaller holder and run the uc from a lower level.
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    High Temperature environment proximity sensor switch.

    Maybe use whatever operates the piston to get to a cooler environment.
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    Tiny motor for a LED Projection

    Mount a mini servo external to the pipe and operate led mount mechanism via a flex cable similar to a bicycle brake inner cable or r/c aircraft controls. Servo can be driven by a $2 controller off ebay. Other micro motors can be sourced from micro heli tail rotor drive but gearing down would be...
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    cheat sheets

    Like this AK.........:)
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    Inverter/mains switching circuit

    An approved UPS would be a good investment.
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    Inverter/mains switching circuit

    Quite a few errors actually, some which could see your pushing up daisies. First is playing with mains supply. Second is the use of non-approved c/o relays. These must be seperate units AND mechanically and electrically interlocked. This is without even seeing how you have physically connected...
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    How to get 3.3 V from a charged LiPo battery?

    The unit you link to in #3 above is a linear regulator. You have to be careful in the translation between Chinese and English, many times they get it wrong. Edit....according to the description, this should be the unit you require. This is voltage adjustable up and down...
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    Where to buy EPROM window stickers?

    Cool if used in air con...:) http://www.ebay.com.au/itm/Roll-Silver-Aluminium-Foil-Adhesive-Sealing-Tape-Heating-Duct-Repairs-17m-x-5cm-/152328691724?hash=item23777f600c:g:IPwAAOSwNnRYlTh5 Edit....I think this next one is what you are looking for...
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    Decoding PWM

    Different signal. Not what you think. RC signal is a span over 20ms.
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    Logic behind resistor values

    You will just have to memorise them, not difficult. Reason for common values is they can be combined to make in-between or multivalue or combination parallel possible easily.
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    Need a simple circuit to reset a device very X minutes

    So like AK says, what do you want the circuit to do? If continuously cycle on and off you could use the 555 in astable mode. Set your on off to whatever via rc arrangement on 555 terminals 6,7 and 2. Forget your wiring arrangement that cuts power to the timer, leave it powered and run your bt...
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    Need a simple circuit to reset a device very X minutes

    If a few milliseconds off is enough, sure.
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    GFCI receptacles tripped for no reason

    A diagram of how you connected everything would be a good start. Then the type of breaker or at least a link to the specs. What loading you have on the individual circuits and what you expect to have running or even simply plugged in to the circuit when the problems occurred. Usually a red...
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    Need a simple circuit to reset a device very X minutes

    If this needs to operate on a continuous basis, ie off, on, off, on etc then the op will need to look at astable configuration.
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    How to get 3.3 V from a charged LiPo battery?

    Another battery.
  20. B

    GFCI receptacles tripped for no reason

    yes. Without further info I'm afraid that's as much as I can say.
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