Pls help me explain this charger circuit

Discussion in 'The Projects Forum' started by TYYang, May 4, 2015.

  1. TYYang

    Thread Starter New Member

    Apr 3, 2015
    18
    0
    This is a solar energy charger and have a PNP 2N5401 transistor

    can anyone explain to me about how this circuit can work ? and the LED can light up when battery is implement.
     
  2. Ramussons

    Active Member

    May 3, 2013
    557
    92
    The "top" circuit has something wrong ....... What is source 1? Source 2? Single line sources? o_O
    Re trace the circuit.

    The "bottom" part seems OK.

    No 1.2 V NiMH battery1 , no Q1 base drive, no led1 drive.
    NiMH battery1 in position, yes Q1 base drive (battery charge current partly thru' R2, partly thru' Q1 base), led1 driven to light.

    and so for q2 q3 q4.
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,974
    744
    It wont work, the nimh batts wont charge.
     
  4. Ramussons

    Active Member

    May 3, 2013
    557
    92
    Yes, at 3 mA! o_O

    The OP wanted to know how an inserted battery lights the LED :D
     
  5. LDC3

    Active Member

    Apr 27, 2013
    920
    160
    How did you get 3 mA, I got less than 0.06mA.

    Are D1 to D4 diodes or zener diodes? If zener, what's the breakdown voltage? If they are regular diodes, why are they there?
     
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