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    Closed: Re: uc3842/3843 Vcc problem in smps.

    it is possible, but i think the problem is not with the series light because i using this method before this with smps.

    and the smps start working even by putting some low load upto 30watt. i...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    the 84vdc at the Vcc is when the circuit without uc3843 or uc3842 at 21v zener diode.

    then i switch off the power & completely discharge the main bulk capacitor through discharge resistor of...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    the zener and ic both are ok. i place the ic when the bulk capacitor completely discharge after switching off.

    i 'm using series light trick for checking because i have no other method to prevent...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    by placing zener diode of zd/21v the Vcc reduce to 84vdc without ic in the circuit. by placing ic in socket the Vcc drop to 13.5vdc round about and for

    uc3842 and 8.9vdc for uc3843. now i put the...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    i also used zener diode of 18v at the gate of the mosfet for this purpose in my pcb layout not mention in schematic.

    i also used IN5818 to clamp the pulse high volt. may be it will be the dried...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    off course its my mistake C1 & R2 are both across the rectifier at output side. this schematic is from

    powerEsim software but i made a little changes according to my pcb layout above i made.
    ...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    i tell one's before this i didn't sell in the market not intend to sell it. i'm currently working on it. also you only criticizing not telling about the problem sorry

    please leave this thread &...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    i think this might be the problem & there is no difference b/w the working and not working circuit. then how to solve this problem ?

    - - - Updated - - -



    how the problem pointed can be...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    dear i tested this circuit by building it in my home at least about 5 times. also i didn't place the zener on the Vcc it works fine for hours

    i tested it with 12vdc/80 watt car headlight. the...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    off course there is no zener on the Vcc to limit voltage. but i'm not sure whether it will solve the problem or not.

    if i place the zener on Vcc will it stop blowing the power fet?
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    this is not the final layout with all possible safety protections. i currently working on this power supply testing for my own purpose.

    the final layout will be redesign by expert pcb designer,...
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    Closed: Re: uc3842/3843 Vcc problem in smps.

    i 'm using uc3842/uc3843, i made the smps many times and its works fine this problem doesn't arise

    in working power supply, but sometimes this problem occurred with me but i dont know its reason...
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    Closed: uc3842/3843 Vcc problem in smps.

    i 'm facing the problem of uc3843/3842 VCC in a uc3843 based smps that show Vcc about 86vdc or even greater

    when the power mosfet & ic is not in the circuit. but when i place the ic, the voltage...
  14. Closed: IR2153 based Half Bridge smps with feedback.

    157606

    the IR2153 doesn't have any pin for feedback for voltage regulation.

    is it possible to add a feedback circuit to this smps based on IR2153?
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    Closed: Re: Feedback less PushPull Converter

    the duty cycle of the pulse will certainly change by putting load if the circuit has feedback.

    in case if there is no feedback to the mosfet driver section the PWM duty cycle will not increase
    ...
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    Closed: Re: Feedback less PushPull Converter

    How it is possible to get voltage regulation without voltage feedback to the mosfet driver section.

    the output will certainly drop by putting load on it.
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    Closed: Re: push pull ac-dc auxiliary winding.

    i see that the driver power supply is not shown here in schematic also the winding (N2 + N3) doesn't make sense.

    that's why i ask the question. but unfortunately i don't have another schematic of...
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    Closed: Re: push pull ac-dc auxiliary winding.

    157441

    that's the complete schematic of the push pull AC to DC converter taken from

    powerEsim. i didn't understand the purpose of (N2 + N3) winding here in the schematic? is it the power to the...
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    Closed: push pull ac-dc auxiliary winding.

    157439

    what's the purpose of the (N2 + N3) center-tape winding in push pull Ac-Dc converter

    as shown in above schematic. is it a kick start auxiliary winding? if not

    how to start the smps...
  20. Closed: Re: Sensitive metal detector using microcontroller ADC channel.

    i make the search coil with inner diameter of about 1.3 inch & outer diameter of about 8 inch with wire having length of 25 meter

    as shown in post # 4 & design the circuit layout as according the...
  21. Closed: Re: DIY USBasp Programmer/PIC Serial Port Programmer

    157058

    it mean first bootload atmega8 and then we have to burn the file as

    indicated above for the circuit to works as programmer?

    157059

    what for this pic programmer. can we program...
  22. Closed: DIY USBasp Programmer/PIC Serial Port Programmer

    is it necessary to bootload atmga8 for making diy usbasp programmer

    mentioned on the usbasp programmer link http://www.fischl.de/usbasp/?

    or a blank ic may be used here?

    also for making...
  23. Closed: Re: Sensitive metal detector using microcontroller ADC channel.

    its right to use 7805 regulator. but if to increase the range/depth of the detector, the problem will

    be solved only by using greater numbers of turns of the coil?
  24. Closed: Re: Sensitive metal detector using microcontroller ADC channel.

    156928

    i 'm going to use the above circuit of metal detector but here in the schematic they use 4.5vdc

    both for the colpitts oscillator & arduino. how the circuit can changed so that...
  25. Closed: Re: Sensitive metal detector using microcontroller ADC channel.

    the schematic along with arduino source is available on github. but the output of the colpitt oscillator is not

    square wave. can i use 555 ic as schmitt trigger to converter the oscillator input...
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