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Voltage regulator output question

Discussion in 'General Electronics Discussion' started by BRO, Oct 21, 2013.

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  1. BRO


    Oct 21, 2013
    Hi all, fair to say I am new to circuit building, but have been slowly getting some experience.
    The question I have is regarding Voltage regs. I am rectifying 26Vac with a 2A bridge rectifier. I get about 23Vdc output. I then connect my 7815CV voltage regulator to the DC output, but I am only seeing 12VDC. I am not sure why, can anyone shed some light on it?
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    Hello and welcome to Electronics Point :)

    Start by showing us a complete circuit diagram.

    Do you have a smoothing capacitor after the bridge rectifier? Your answer should be yes.
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    I guess the answer will be no. That explains the 23V DC measured and the irregular behaviour of the 7815.

    Also a pair of decoupling capacitors (100nF each) from input to GND and from output to GND will help the 7815 to work stable.
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