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  1. Quote Originally Posted by Robin Hewitt View Post
    Problem with a 12 Volt battery is you will get over voltage when fully charged. 9 Volts really is the best bet, unless you pop in a regulator.

    Can you get a 9 Volt regulator or do they leap from 6 to 12? 12 would very quickly have the same problem, even if low drop out.
    Yep, LM2940CT-9 Buy Low Dropout Voltage Regulators 1A,9V,LDO Voltage Regulator,LM2940CT-9.0 National Semiconductor LM2940CT-9.0/NOPB online from RS for next day delivery. 9v out @ 1A max, max 0.2v dropout @ 100mA, typ 0.5v @ 1A. Only 1.33 each. They do a 10v one as well.

    As an alternative MC2941 http://www.rapidonline.com/Electroni...egulator-65305 @ 1.75 will also do the same, but is programmable for any output voltage with 2 resistors.

    Either will handle 12v -> 9v @ 400mA with no heatsink (tho case will be > 90degC so hot!) but a small clip on heatsink would be advisable (or just a couple of sq in of ally) if using a lead acid cell or other battery thats at 13.6v fully charged
    Last edited by irving2008; 30-09-2012 at 09:50 AM.

  2. #12
    Quote Originally Posted by martin54 View Post
    What sort of size is the tank it's going into? Sorry don't know much about radio controlled models except some seem to be quite big. Just thinking that a 12v battery from one of those motorized cycles would probably do a good job. Friend of mine lent me 2 to power a small trolley & I was surprised how powerful they were for such a compact size battery.
    Maybe if people are interested I should start a new thread I explain what I'm trying to do and get help with trying to it ? May help others in the future.

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  3. #13
    He's going to attack the Reds from his living room via the Interweb.

  4. #14
    Quote Originally Posted by boldford View Post
    He's going to attack the Reds from his living room via the Interweb.
    I have T59 I know the weakspots lol Thread started if anyone is interested, I'll post as I go :)

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

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