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Type: Posts; User: hemnath

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  1. Replies
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    Closed: water flow detection in a pipe

    I have a pipe diameter(lets say 6 inch size). Water pressure flow rate 0 to 20 GPM. Pressure max. of 31 bar.

    Always there will be water available in the pipe. When there is flow of minimum 4 gpm,...
  2. Replies
    2
    Views
    437

    Closed: auto_off function in microcontroller

    Hi,

    PIC 18F2620, 1MHz internal oscillator,

    I want to auto-off the circuit when there is no change in PV for about 10 minutes. Due to some factors, PV will change slightly. So that we shall...
  3. Replies
    2
    Views
    1,573

    Closed: output changes when I touch the enclosure

    Hi,

    I have a transmitter board which senses the pressure and outputs 4 to 20mA. The board is mounted in a aluminium enclosure using the Stainless steel standoff. The screws used are Stainless...
  4. Replies
    3
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    415

    Closed: low voltage indicator

    I have used LTV3401 as a comparator for low battery indication. Current - Quiescent (Max) is 950nA. But costs 2USD

    Is it possible to use the transistors for the low battery indication. But the...
  5. Replies
    26
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    3,069

    Closed: Re: current excitation for sensor

    sensor which I have is constant current excitation type.
  6. Replies
    26
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    3,069

    Closed: Re: current excitation for sensor

    I have drawn some configuration. If this is also wrong, can you hand sketch and show me.

    Where can i connect REF+ and REF-?

    Sorry for it.
  7. Replies
    26
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    3,069

    Closed: Re: current excitation for sensor

    Can we use a single voltage reference for both current excitation and reference voltage for adc as shown in the fig below.

    Kindly share your comments.
  8. Replies
    8
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    2,885

    Closed: Re: Protection circuit help

    Thanks for your reply. I'm not sure whether the inbuilt features in the IC is enough or should I have external components. That is the reason I had a doubt.

    Regarding EMC, I'm from India....
  9. Replies
    8
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    2,885

    Closed: Re: Protection circuit help

    MIC5236 has overcurrent protection and reverse battery protection.

    Voltage protection upto –20V to +60V.

    that's why I didn't add any external components. Regarding EMC, I don't have knowledge...
  10. Replies
    8
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    2,885

    Closed: Re: Protection circuit help

    NO AC input.

    Only 24V DC or 9V battery. What are the components to be added to add those features? Please help.
  11. Replies
    8
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    2,885

    Closed: Protection circuit help

    Input will be either Battery: 9V DC or 24V DC.

    Output: 3.3V DC

    For battery operation, It has ON/OFF circuit. When the button is pressed, Transistor will provide supply to the Regulator. Again...
  12. Replies
    1
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    1,792

    Closed: Adapter design for pressure sensor

    Hi,

    I have a 19mm dia piezo-resistive pressure sensor and aluminium enclosure(80x75x60 mm), Thickness: 4 mm

    I want to fix the sensor in the bottom of the enclosure.(refer google for digital...
  13. Replies
    3
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    479

    Closed: analog pressure gauge to 4 to 20mA

    Hi,

    I have a analog pressure gauge of range 0 to 10bar. Is it possible to provide output of 4 to 20mA. I just want to try it. But don't know how to convert the mechanical to electrical output...
  14. Replies
    26
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    3,069

    Closed: Re: current excitation for sensor

    Accuracy: designing for accuracy better than 0.025%, I don't mind about the linearity now because that can be solved using interpolation.

    concentrating on the stability of the circuit. That's why...
  15. Replies
    26
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    3,069

    Closed: Re: current excitation for sensor

    Please clarify for below term.

    Initial Accuracy from TI notes:
    The initial accuracy of VREF indicates how close to the
    stated nominal voltage the reference voltage is
    guaranteed to be at room...
  16. Replies
    26
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    3,069

    Closed: Re: current excitation for sensor

    Sorry Back again.

    Pressure sensor is current excitation type. Thus, I have provided 0.5mA . Initially when powered on, whether it is 0.50 mA or 0.60mA, it is not a problem.

    But the current...
  17. Closed: LCD display changing when goes near WALKIE TALKIE

    Hi,

    I have a 8x1 LCD, 18F2520 microcontroller, Crystal 12 MHz, buttons and pressure sensor. Normally it is working good. But When I bring the WALKIE TALKIE, the display values keeps changing. Is...
  18. Replies
    10
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    1,009

    Closed: Re: 9V rechargeable battery circuit

    Hi all,

    I have asked another friend to design a battery charging circuit with sufficient protection.

    Kindly check and provide your comments.

    Battery: 2 lithium 3.6V => 7.2V battery, ...
  19. Replies
    8
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    1,136

    Closed: Low drop voltage regulator

    I'm designing a battery operated circuit where the load current will be max. 50mA.

    Can I use LP2950-3.3V or MIC5236-3.3V?. Which is better. Or do you suggest other IC.

    Thanks in advance.
  20. Closed: Re: overcurrent and reverse polarity protection

    For my application, I want to limit max allowable current to 50mA. Upon that, the circuit should be protected.

    From this, I have calculated R1 as 0.6V x 50mA => 30mOhms
    R2 is no needed means....
  21. Replies
    10
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    1,009

    Closed: Re: 9V rechargeable battery circuit

    Battery type: 9V Lithium Ion rechargeable battery.
    Black square will be Fuse I think so. I'll ask my friend and confirm you soon.
  22. Replies
    10
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    1,009

    Closed: Re: 9V rechargeable battery circuit

    Input will be galvanic isolation. 230V AC to 12V AC.

    The 12V AC is the input to this circuit.
  23. Replies
    10
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    1,009

    Closed: 9V rechargeable battery circuit

    153871

    Hi, One of my friend shared this circuit which charge 9V rechargeable battery with all protections(Overcurrent, Overvoltage, EMC, etc).

    Is this circuit has any disadvantages. Kindly...
  24. Closed: Re: overcurrent and reverse polarity protection

    Designations are noted.

    Input could be 9V battery. Nominal output load will be 5mA.
  25. Closed: overcurrent and reverse polarity protection

    Can someone explain the attached circuit. It is overcurrent and reverse polarity protection. How to choose the values and selection of mosfet.
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