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Thread: 27Volts with out Burning out my Circut?

  1. #1 27Volts with out Burning out my Circut? 
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    Well I am building a HoverCraft (and maybe POSSIBLE FLYING CRAFT) and I am using some 120mm Computer Case Fans that have almost 100CFM.

    The thing is that I was also going to place a Radio Control Circut of a $30 Remote Control Car and I am Affraid that the Circut WILL NOT support the 27V (3x 9 Volt Batteries) that are going to power my fans.


    ANY IDEAS of what I should do?


    If there was no religion in which Gods would be the main issue, war would now be a fight agaist the best scientific theory.
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  3. #2  
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    Well if your RC electronics can tolerate 9Volt instead, it is quite simple.
    For the motors, use the 3 batteries in series. For the RC electronics, only the first battery

    Good luck


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  4. #3  
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    "For the motors, use the 3 batteries in series. For the RC electronics, only the first battery"

    Is the issue resolved?
    K. Srinivasa Ramanujam
    M.S (by Research) Scholar,
    http://ramanujamblog.blogspot.com
    India
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  5. #4  
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    Not sure.. Haven't try it...

    But what do you mean place it the 3 batteriest for the motors and then the first batter ... I got confuse
    If there was no religion in which Gods would be the main issue, war would now be a fight agaist the best scientific theory.
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  6. #5  
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    He means wire the three batteries in series to add up the voltages to 27 volts, call them Battery A,B and C. so A+ to B- and B+ to C-
    now if your electronics board is the 'Negative common' type then connect the negative of the board to the A- along with the negative wire of fans.
    Connect the board + wire to A+.

    Here's the tricky bit IF your board output signals come from a relay and are just 'isolated switch terminals' connect one wire to the positive of the fans and the other to battery C+

    IF your circuit uses 'open collector' outputs then you will need to add a 9V relay, with the supply coil connected + to battery a+ and - to the open collector output, then use the switch terminala as above.

    IF your board is Positive common then it will need to be wired differently.
    See if the baord spec mentions something like 'Isolated outputs'

    A good one will, a cheap one will not.

    If all this makes no sense then don't try it, a single error could destroy the board, if you have an electronics lecturer, print out the thread take it with your design, and ask for help.
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  7. #6  
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    Wow.. .almost no sense... but now that I know that it is possible in a way I might as well buy my self a remote control car and rip out the circuit.
    If there was no religion in which Gods would be the main issue, war would now be a fight agaist the best scientific theory.
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  8. #7  
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    Quote Originally Posted by itstemo1
    Wow.. .almost no sense... but now that I know that it is possible in a way I might as well buy my self a remote control car and rip out the circuit.
    No sense? - connecting three batteris to add up the voltages but only using the first one to power the electronics? Then isolating the low voltage control circuit from the high voltage lines(27v)...

    Makes perfect sense.
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  9. #8 alternatively 
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    Alternatively I think you should go to the local electronics store and ask them for a suitable voltage reducer, or regulator. Tell them what you want to do and they will suggest something.

    Frankly though, if you can't understand the concept of taking a wire tap off the first of 3 batteries that are in series, then you probably don't know enough about electronics to attempt this. Nothing personal.

    Regards
    Robert
    ( http://www.priority1design.com.au )
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  10. #9  
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    use regulator ckt, unilateral buffers, also use fuse in case if voltage exceeds above tolerance limits.
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  11. #10  
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    Quote Originally Posted by weknowtheword
    use regulator ckt, unilateral buffers, also use fuse in case if voltage exceeds above tolerance limits.
    'unilateral buffers' ??

    and fuses do NOT protect against overvoltage, they merely 'break' when the current exceeds their specified maximum rating for a particular amount of time.
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  12. #11 Re: alternatively 
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    Quote Originally Posted by p1drobert
    Alternatively I think you should go to the local electronics store and ask them for a suitable voltage reducer, or regulator. Tell them what you want to do and they will suggest something.

    Frankly though, if you can't understand the concept of taking a wire tap off the first of 3 batteries that are in series, then you probably don't know enough about electronics to attempt this. Nothing personal.

    Regards
    Robert
    ( http://www.priority1design.com.au )

    Yeah... I would probably not do this anymore
    If there was no religion in which Gods would be the main issue, war would now be a fight agaist the best scientific theory.
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