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  1. B

    Learn Arduino

    Using the clone versions of Arduino from Ebay etc will save you some bucks. Many sensors and associated parts available there also. IDE is free.
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    Hall effect controlled fuel injector

    Don't see why you have any sensor inside the crankcase. All relative information can be collected externally. Former only creates another unnecessary complication.
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    Hall effect controlled fuel injector

    Rail to rail open collector such as an Allegro A1120 and use it to drive a mosfet. Control whatever you want.
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    Help with Voltage Regulation

    Cross posting will get you in trouble.
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    Slip up!

    CRC type is ok. What is a voltage dropper? If a power pack unit, is it working?
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    Cheap linear actuators

    Ian, The motors in the link in your first post are available with tiny encoders mounted on the back end which would help for position control. Also Hobbyking have a range of servo-less retract units, some for around Aus$12.00 which are basically a linear servo. Just thought you might be able to...
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    ESP8266/Arduino 24v DC common ground?

    The relay unit inputs require a low signal to turn each relay coil on. A 24v trigger from your Rx unit will not work unless it is a negative going signal and even then, may be too high a voltage for the relay unit. Normally these input pins are connected to uC pins with between 3.3v and 5v...
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    Use an ignition coil to charge an electric fence.

    I'd be surprised if the "modern" coils are not cdi. Hacking them open will not prove much as the difference between kettering and cdi would not be visible.
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    ESP8266/Arduino 24v DC common ground?

    Diagram has several (many)errors. What is the transmission signal on the Arduino supposed to represent? Do you have specs on the relay unit and which Arduino are you using and what voltage ( why 3v). Common grounds are usually the norm but there are exceptions. What are the garage +- squares...
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    PUPS Problems with Uninterruptible Power Supply

    As in #2, what is the power requirement? Small size , high capacity, generally do not go together. I have no idea what size a macbook is.
  11. B

    Need help with wiring an electric motor

    Can't see the diagram and it is out of focus. Try like another poster did here, light the subject via other source and turn off the flash. Try to use some form of punctuation to make your request readable.
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    Use an ignition coil to charge an electric fence.

    Doubt you'll get 30,000 v from a kettering coil. Any circuit like a 555 set up as astable with the right switching element should do ok. Why not just buy an approved electric fence unit?
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    Power source for smoke detector

    Backup batteries should be replaced every 12 months regardless. If the backup starts to run below acceptable level, they usually start to hiccup( beep) There are units available with internal 10 year backup (non-replacable) as after this period the units are out of date anyhow. Interconnection...
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    Digital piano won't power ON

    Not if the flat was caused by a whopping great nail. Never seen a flat tyre caused by a crook ball joint. You know full well by making a statement like that, you are simply nitpicking. Point is, op found a shorted diode and as such I was curious as to whether or not the unit now has the 5v...
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    The low quality busted headset sounds underwater effect

    Just wondering why you need to ask if you think you already know the answer.
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    Designing a Battery Backup for a security system

    I don't see why you need a "bunch of AA's in parallel. Just put back new of whatever was there before. I'm sure the designers knew what they were doing.
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    Triac Problem

    Floating pins usually cause many problems.
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    Hello from Croatia

    What is "xd"???
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    What kind of diode is this?

    Except for thinking the diode needs replacing, I for one have no idea what you are describing.
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    What is recommended charger output voltage for a 3V rechargeable AA cell?

    You can make yourself a nicad charger with any power supply ( say 12v dc) and use a simple circuit with an LM317 regulator set up as constant current. Then you can add any number of cells ( up to 8 in series) and monitor and adjust output current to say 100 mA with a pot. Used one here for 20...
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