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Thread: I want to do this but....

  1. #1
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    I want to do this but....

    where can i get a neat DPTP switch? I want it for a 12v/7v fan switch

    DTDP is basically a switch with 3 possitions AFAIK, (ON/OFF/ON)

    I really want a shop as in pc world instead of maplins etc because the switch is 50 and postage £2.50

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    Taz
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    Maplin shop? Here's the store finder:

    http://www.maplin.co.uk/StoreLocator.aspx?doy=28m5

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    Ah, didnt realise they had shops!

    Unfortunatly there doesnt seem to be one near me.

    Just thinking about it, do i need a DPDT switch or can i have just a switch with 4 pins on the bottom instead of 6?

    This is the page i've been looking at and it says DPDT switch, i see it has wires going to all 6 pins but if a dpdt switch is ON/OFF/ON can i not just have a ON/ON to switch between 12 and 7 volts?

    Thanks
    Ben

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    Taz
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    I think you will still need a DTDT switch (ON-ON version) to get 12V/7V to your fan. Not all DPDT swtiches are ON-OFF-ON (3 position, centre-off), you can get ON-ON DPDT switches as well and these would be better for you as you don't want the OFF position as this will turn off the power to your fan!

    Also take a look at this thread for a bit more info:

    http://forums.hexus.net/showthread.php?t=36266

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    Thanks, the reason i'm thinking about the switch is that i want to be able to switch to 7v in warm weather and 12v in hot weather/gaming

    Might even do it at 5V and 12V

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    Senior Member SilentDeath's Avatar
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    www.rapidelectronics.co.uk are better than maplin, and have free postage unitll tuesday 8AM.

    Have a look at here which has a lot of other ways to do it which give better results. I use the switched diodes method for low power things or for my waterpump I use a variable regulator (LM338T).

    You would need a SPDT switch.
    Code:
    12v > fan > center of switch _ > ground (for 12v potential)
                                 \ > 5v (for 7v potential)
    Last edited by SilentDeath; 29-05-2005 at 05:49 PM.

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