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  1. B

    Homemade starter relay sticks

    You will never replicate the material required for this. Just buy a starter solenoid. Your 90 amps would be a rather conservative estimate, try perhaps 3 or 4 times more.
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    Need help making my own Arduino without buying an Arduino board

    Yes, logic on one hand but not the other.o_O
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    Fire risk?

    Might need a resistor in there also. Otherwise, it depends on what LED.
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    Microcontroller controlled by pushbutton for LED flashlight

    Give some thought to what will turn it off also.
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    Use 2v Signal to Control 12v LED strip

    Look at requirements for logic level mosfets.
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    TV Antenna?

    Assuming terrestrial... Usually designed on the span of the channels they will receive...the tighter the span the better. Then whether VHF or UHF, then whether you are in good reception area or not, then higher gain antenna required for the latter plus perhaps masthead amp for either depending...
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    Analyzing Car Charger for HAM Radio Battery pack

    Easy find.......http://www.hobbyking.com/hobbyking/store/__10327__HobbyKing_8482_Quattro_4x6S_Lithium_Polymer_Multi_Charger.html
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    Use 2v Signal to Control 12v LED strip

    Mosfet would be good if you can find one with a low enough turn on...don't know for sure what the requirement is for the L series. I've often used them for logic circuits (5V) Could make up a voltage doubler(or trippler) and drive the gate with that I suppose. Other than that, a transistor...
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    HELP!!! Kinetic Lamp design project!

    A qualified electrician is not going to "rig" something up to your specifications, but rather to what the law requires. In the past, depending on what country you reside, one-off items such as this would require a one-off certification from a local authority before being connected to the main...
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    Sealed Lead Acid Batteries

    Fit new battery, if existing was left without charge for "a while" then chances are it will be dead (replace with same type) Test voltage (should be around 12 volt or slightly higher) plug in main unit to mains supply Recheck battery voltage starting to increase in value over a period of approx...
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    newbie needs basic help please

    Encosed a copy of basic diagram. I have not included fuses or circuit breakers but you can add as you see fit. Main contactors are shown as 2 lines and 1 auxiliary contact but you will find most contactors have 3 lines and probably 2 sets of auxiliary, 1 n/o and 1 n/c. I assumed from you that...
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    newbie needs basic help please

    I'll draw something up for you later (have to work now) but to start with, forget the contactor you linked to as it is (a) AC coil and you are using DC and (b) as mentioned above you need some interlock to avoid both contactors/relays from coming on at the same time causing a dead short( not...
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    newbie needs basic help please

    Need information on all the parts you plan to use. I have a feeling you have a confused view of the requirements to achieve what you intend.
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    How to switch off an audio signal

    Perhaps a small normally closed relay?
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    IGBT Sine Wave Dimmer

    No "massive" inductors in the ones we use here and all comply with relevant worldwide authorities, come on a case no more than 20*20*30mm. Many different types for just as many applications.
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    IGBT Sine Wave Dimmer

    I thought triac phase control was sine wave control. There are many high tech dimmers out there already which use both leading and trailing edge dimming to overcome the problems you encounter with incandescents and with LED dimming. These days, incandescent are on the way out and they themselves...
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    Lens info needed

    Some LEDs already have a lens. You will need to look at the spec sheet for the particular LED you are using.
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    IGBT Sine Wave Dimmer

    Do you have a problem with using triacs as they are designed for this type of work, simpler to use and less components.
  19. B

    Wiring a Counter

    3 x 9 = 27 (too high) 2 x 12 is ok = 24
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    ? about forcing motor to turn in the opposite direction to powered rotation.

    Any force that causes a reduction in speed creates a greater current drain due to loss of back emf. Locked rotor would be maximum. Result would be damage to both rotor and field windings (if any)
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