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2 Diodes in Series

Discussion in 'General Electronics Discussion' started by Al Slitter, Nov 9, 2016.

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  1. Al Slitter

    Al Slitter

    Nov 4, 2016
    Hello All;
    I just finished this circuit and it seems to be working well.
    It is a very simple build but I have a question, if you look at the schematic you will
    see two Diodes (1N4007) in series. Being a newbie can someone please explain
    their function and why they are used in the device?

    Image below:

    PS for Clock.png

    Thank you
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Each diode has ~0.6 V forward voltage. 2 diodes sum up to ~1.2 V. This is used to limit the voltage across the capacitor and NiCd cell to ~1.2 V.

    Note that this circuit is directly connected to mains! This is not a safe circuit if there is any chance that the output (to wall clock) can be touched. As the wall clock is obviously designed to be operated from a battery, it will provide no safety relevant insulation at all.

    Do not use this circuit in this application!
    dorke and hevans1944 like this.
  3. AnalogKid


    Jun 10, 2015
    1. The two diodes in series act as a zener diode to limit the peak voltage across the output.

    2. This circuit can kill you.

    Tripurari Jha and hevans1944 like this.
  4. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    Are you seeking to posthumously win a Darwin Award with your project? Or perhaps, win one for a friend or family member?
  5. 12vdc


    Apr 13, 2011
    I can't stop laughing even if I let go of the wires
    Last edited: Nov 9, 2016
  6. davenn

    davenn Moderator

    Sep 5, 2009

    Thread closed
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