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Recent content by omshankar

  1. O

    15v 6amp switched mode power supply circuit

    thanks for ur reply... but can you provide the circuit diagram for this topology...and component detail which is easily available in market. thanks....
  2. O

    15v 6amp switched mode power supply circuit

    hi friends......... I wanna make switched mode 15 V 6Amp power supply for my project. please suggest me which is best and cheapest topology and circuit diagram for that power supply.. please help me...... thanks...
  3. O

    Behaviour of diode 1n4007 at 220V ac

    hi nitish, 1. I'm using oscilloscope ground. which are giving me this difference. 2. Oscilloscope ground.(0Volt) 3. 203 V at top terminal of 220k resistor.
  4. O

    Behaviour of diode 1n4007 at 220V ac

    thanks for ur reply..... my actual arrangement like that..... in this figure i want to ask you that what is the reason for negative voltage at rectifier ground while in datasheet the breakdown voltage is given V(RRM)=1000V. and V(rev RMS)=700V. i think current is again responsible for this...
  5. O

    Behaviour of diode 1n4007 at 220V ac

    thanks for ur reply nitish..... I just want to know that why diode breakdown at 220V reverse voltage while the breakdown voltage is given V(RRM)=1000V. and V(rev RMS)=700V. and there is no transformer isolation provided in circuit. one more question if i connected a capacitor across it then...
  6. O

    Transformerless charger (20 Amp)

    thanks Kabeer for ur post.....
  7. O

    Transformerless charger (20 Amp)

    @Kabeer02: Thanks for ur reply.... But I need transformer-less power supply for my circuit.
  8. O

    MOS transistor in swich application

    Any switch perform switching action only on the basis of resistance. ON switch means NO resistance. OFF switch means infinite resistance.
  9. O

    Behaviour of diode 1n4007 at 220V ac

    Thanks oh u want to say that there is ground voltage of rectifier and supply totally different..... then how could i measure the signal which i dropped using the voltage divider at rectifier output terminal.
  10. O

    cheapest uC available in market

    please refer this forum community related with microcontroller....... and one of the best searcher.....GOOGLE..
  11. O

    Transformerless charger (20 Amp)

    Can any one give me this ciruit diagram to me..... my id is (pandeyom9@yahoo.com) Thanks........
  12. O

    Behaviour of diode 1n4007 at 220V ac

    no i dnt hv any transformer between mains and bridge..... - - - Updated - - - @Nitish: Diode PRV is 1000V but reverse breakdown voltage is 120 V at room temperature. U can prefer in reverse characteristic of diode.....
  13. O

    Behaviour of diode 1n4007 at 220V ac

    My bridge rectifier(1N4007) is giving some voltage at ground terminal of bridge while measuring with the ground of oscilloscope at 220V 50 Hz power supply..... I found a reason for this the breakdown voltage of diode is 120V. dts y all diode conducting beyond d 220V and gives reverse voltage...
  14. O

    TRIAC and ic555 based voltage regulator 220v to 12v 72 watt

    thnx Bradtherad......... what should be the value of these resistors?
  15. O

    TRIAC and ic555 based voltage regulator 220v to 12v 72 watt

    thnx for response, But I want to make a 220V AC to 12V 6A DC supply using TRIAC or MOSFET whatever feasible according to this circuit. Anyone provide me circuit diagram Circuit should be transformerless..
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