Setup diagram of an Alfa branded 12 Volt 20 Watt CFL kit

This CFL lighting kit is available from a reputed brand alfa, which is known for it’s circuits in applications of inverter like products.

We get a good stable circuit from them. The below kit is for lighting a  PL of 9Watt, 11Watt or a CFL of upto 20 watt (of course PF=0.50 CFL’s).

Earlier we saw, how can we make 12volt 18 watt by a simple circuit diagram link HERE. This circuit is almost the same with modifications in the output side as we can see a comparably larger  capacitor used in series with transformer output for coupling purpose. This gives us the ability to run PL (starter based) lamps too directly with this circuit.

If we look at the primary side circuit , we can see an inductor coil is used to filter AC pulses from +ve line. There are charging line provided also, for which we need to add a transformer, and the complete setup ready.

This one costs 120 rupees, but we can make own at just 50 rupees by the help of the circuit in the previous topic, but if we need quality, and reliability, then we need to use this one for better results.

Comments on this article before 07-12-2011, here jump to recent comments .

  • raju on May 6, 2011 – 12:31 pm

    cannot understand well, dont thing every one have read all articles in this blog. each post should be comprehensive and complete. google get me here and you are speaking like i have read all of your posts. make it better

    Arup Reply:
    May 6th, 2011 at 12:34 pm@raju,
    sorry, but this is just the commercial product of the circuit I shared earlier, since talking about same circuit again is foolishness, I gave link to previous article and did a breif comparison here among these two products.
  • rakesh on October 19, 2011 – 8:39 am

    very good job
    i want to start a cfl industry .
    please tell me total cost i need your help

    Arup Reply:
    October 22nd, 2011 at 3:42 pmWell, I’m not into this business.
  • Prasun on November 15, 2011 – 5:01 am

    plz tell me, the capacitor specification which is use series with transformer output for lighting a 20w cfl.

    Arup Reply:
    November 15th, 2011 at 5:38 am1mfd (105) 400V nopolar.

    Prasun Reply:
    November 15th, 2011 at 7:37 amI brought a capacitor (CARL I MTF, 105K 450 V, 100128A15), is it applicable for this case?….and how to connect the capacitor? plz tell me
  • Prasun on November 15, 2011 – 7:51 am

    i do not understand “capacitor used in series with transformer output for coupling purpose”.plz tell me………

    Arup Reply:
    November 15th, 2011 at 8:06 amSetup it like the following sketch,
    Transformer, CFL, and capacitor will be in series.—-*———|105K|————–*——-[
    T |                 &nbsp                          | CFL
    R |                 &nbsp                          |
  • Prasun on November 15, 2011 – 9:27 am

  • Prasun on November 18, 2011 – 1:20 pm

    plz tell me,what is the difference between PL,CFL and HPF

    Arup Reply:
    November 18th, 2011 at 2:06 pmPL= just the lamp of CFL
    CFL= lamp+circuit making a complete compact tubelight
    HPF= High power factor, this is for indicating the power ratings of CFL.

    Prasun Reply:
    November 18th, 2011 at 4:42 pmthanx
  • Prasun on November 18, 2011 – 4:43 pm

    i brought a 11 w crompton grips cfl light,but it is not lighting by the kit(12v ,11w PL).why it is not lighting? and what company cfl (w) i use for bater operaion?

    Arup Reply:
    November 23rd, 2011 at 9:14 amThe cheap 25-30Rs ones work best in this application.
    No matter which brand you buy, see in CFL’s body to make sure it’s 0.5PF
  • Prasun on November 18, 2011 – 7:40 pm

    >0.85 cfl light is applicable in this circuit?

    Arup Reply:
    November 23rd, 2011 at 9:14 amMore than 0.55PF is not compatible, and thus >0.85 will not work.

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8 Responses

  1. Rahul Deb says:

    Mr. Arup i am actually a management student, but still i have great interest in electronics, and i keep on practicing. I always wanted to know that, in an 6volt-9watt CFL kit’s push pull transformer how many turns are threre in both primary and secondary stage, and what should be the number of wire in indian value, for an example; Natun kit, Ankit Kit or in anyother kit???? please let me know, i will be grateful to you. Thanks

  2. gopan says:


    In this your not given the detail of tarnformer like the gauge of copper,number of turns,size of ferrite core etc



  3. vijay says:

    hai ,

    if i want to light up >0.5 PF cfl’s (>0.8) what type of inverter circuits i require

  4. GOBINDA says:


  5. vivek says:

    Pls,mr.anup can u mail me the circuit,how we get 11watt output fm 12v dc supply…pls expain hw it work..

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