1N4148 switching signal diode / series diode, polarity reversal protection

Discussion in 'General Electronics Chat' started by carlva, Jul 26, 2017.

  1. carlva

    Thread Starter New Member

    Jul 26, 2017
    1
    0
    I am building a mobile phone solar charger.

    Most examples include a 1N914/1N4148 switching signal diode at the solar panel.
    The purpose of the diode is to prevent the solar panel from draining power in dim light.

    I'm using a YwRobot MB102 power supply module.
    It has a series diode for polarity reversal protection.

    Do I still need the switching signal diode?

    Thank you for your help.
     
  2. dl324

    AAC Fanatic!

    Mar 30, 2015
    7,212
    1,672
    If I understand your description correctly; no.
     
  3. MrChips

    Moderator

    Oct 2, 2009
    17,075
    5,281
    1N914 and 1N4148 are small signal diodes.
    Max forward current is 200mA.
     
  4. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    7,586
    1,250
    Go for a 1N5817/9 series diode...
     
Loading...