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Need help on Cap value for V "smoothing"

Discussion in 'General Electronics Discussion' started by rotagen, Mar 27, 2011.

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  1. rotagen


    Mar 27, 2011
    Hey all,

    I have installed a "hack module" into my Radio Control transmitter converting the Tx from FM to 2.4 GHz.

    The problem was once installed, I got voltage flickering on my Transmitter which was designed for FM, so it saw the lower V as a battery runout problem and beeped constantly.

    Forums on RCgroups gave me an answer, to solder a capacitor between the + and - leads of the hack module at the circuit board.

    Problem is, I have heard 47uF and 470uF as the proper value for this capacitor.

    Only thing I can give you is the Tx is running on 11-12 Volts when the battery is fully charged. My 47uF cap solved the flickering Voltage problem, but am I in danger of not supplying the full voltage to the module with this value of a cap?

    Heres some more info that may help, the voltage readings on the transmitter (without the cap installed) are bouncing from 11.3 to 8.2.

    I'm guessing if the value is too small, its the equivalent of a short circuit.
    Last edited: Mar 27, 2011
  2. davenn

    davenn Moderator

    Sep 5, 2009
    no, the capacitor value wont change the voltage it will just help smooth out the variations in the voltage. if its a 10 - 12V supply use a capacitor of at least 16V rating preferably 25V. The voltage rating of the capacitor is to protect the capacitor, it wont affect the operation of the circuit.

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