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  1. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    Ohk and lastly, which is more feasible to implement - 1 resistor and 3 capacitor (connected to a rotary switch) or 1 capacitor and 3 resistors (connected to the rotart switch) considering lossesthat might occur in charging/discharging of capacitor?
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    Trigger Pulse for IC555 using Inverted Square Pulse

    Alright got it.. thanks a lot! But you sure about the buffer section right?
  3. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    IC555 because it has a stable circuitry with not too much to worry out.. plus my company head doesn't want me to use many IC's but work with transistors only :( Yup a voltage comparator using op-amps with low output impedance I tried it once earlier but couldn't succeed hence I was thinking of...
  4. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    I'm sorry I kinda didn't understand your solution Slight changes to the requirement. The 230V AC Signal is applied to a bridge rectifier which converts it to 326V DC. The whole system is isolated. Now if due to voltage fluctuations if the applied voltage goes below 60% of 326V, then a LOW...
  5. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    So basically this is being achieved using a 2-input NAND Schmitt Trigger. Can this be implemented without the use of IC's? As in 555 as the only IC?
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    Trigger Pulse for IC555 using Inverted Square Pulse

    Yeah sure :)
  7. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    Yeah from High to Low transition :)
  8. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    It repeats as per the highs and lows on the rectangular wave.
  9. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    Sorry made a mistake in the post.. have corrected it as well. It isn't 50Hz. It is dependent on the Voltage Sensing section.. as in it variable on the input that is provided to the sensing section. If it is greater than 60% of 230V AC then we get a positive in the square wave otherwise if lesser...
  10. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    No not 50Hz, It is dependent on the Voltage Sensing section.. as in it variable on the input that is provided to the sensing section. If it is greater than 60% of 230V AC then we get a positive in the square wave otherwise if lesser than 60% of 230V AC then 0V. These are N channel E-MOSFET's...
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    Trigger Pulse for IC555 using Inverted Square Pulse

    So this is the logic that I want to implement. Voltage Sensing part is designed. So that's not much to worry about. My only doubt is how will the buffer stage exactly look like and how will the trigger pulse be generated in accordance to the logic I mentioned above.
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    Trigger Pulse for IC555 using Inverted Square Pulse

    Ok I'll try to explaining the whole circuit at the best I can. The first stage is a voltage sensing stage. It's output is such that if the Input voltage is above 60% of 230V.. we get a positive 12V DC as output but if lesser than 60% then we get a 0V DC Output thus creating a Square Wave. The...
  13. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    I somehow didn't understand the circuit you just posted :P Forget the delay part and mosfet's.. Now, how will you convert an inverted square wave(rising edge triggered) to a trigger pulse for IC555
  14. V

    Trigger Pulse for IC555 using Inverted Square Pulse

    Yup this is the schematic diagram till now. IC555 works in a monostable mode with the option of having an option of varying the delay it can give.. 0ms, 1ms,2ms and 5ms
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    Trigger Pulse for IC555 using Inverted Square Pulse

    Hey, I have this circuit idea of which I'm somewhat confused about its logic on how I should on to implement it. I have a voltage sensing section that gives me a square wave of 12V DC. This is applied to a buffer stage which produces 2 12V DC Square Waves on parallel lines. One line goes to a...
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    Not getting the ideal 555 output

    Implemented a capacitive power supply to get the constant 12V. Colin could you provide an explanation or a link for how the Darlington pair operates in making that short trigger pulse?
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    Not getting the ideal 555 output

    I implemented this circuit and am getting the output desired but what I observe is that if I dont connect anything across the Zener diode (i.e. if I remove everything after the capacitor connected parallel to zener diode) i'm getting a constant a 12V but if I connect everything I dont get a 12V...
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    Not getting the ideal 555 output

    So it will have nothing to do with the output of IC555. And what about the specs of IC555.. I mean will it be able to handle any amplification in current considering worst case scenarios of over current situations?
  19. V

    Not getting the ideal 555 output

    Because this output is going to drive a E-mosfet which is connected to an inductance coil. My main objective is charge that coil with a current of 900mA and for 500ms only. So with the amplification of current will it have any effect on what the coil would get from the mosfet?
  20. V

    Not getting the ideal 555 output

    Ok Got it but 1 doubt.. won't the darlington pair or basically the 2 npn transistors connected amplify the current?
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