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Type: Posts; User: HWguru

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  1. Replies
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    Closed: Re: ECG Front End Circuit

    Thanks for your reply , this can be the starting point for me to build the front end circuit

    - - - Updated - - -

    But i would like to have a look at the front end circuit , i need to know how...
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    Closed: [Moved]: ECG Front End Circuit

    Hi All,


    I am searching for a circuit design to acquire ECG signals from patients finger tips .

    I am referring to these devices :

    http://www.alivetec.com/alivecor-heart-monitor/

    Has...
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    Closed: Your Embedded Design partner

    Hi ,

    Please visit my page for any help regarding your FPGA or Microcontroller projects :

    https://www.facebook.com/Embedded-Strings-Inc-446837178702797/

    Regards
  4. Replies
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    2,086

    Closed: Re: Electromagnetic field sensing

    Here are the results of testing Rx coil with a 8-order Sallen-key active filter , on the last stage of the circuit i ran out of accurate values of the capacitors or the sales guy from where i bought...
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    2,086

    Closed: Re: Electromagnetic field sensing

    i was reading the literature of one such switched-capacitor lowpass filter IC i.e MAX291 , sounds very tempting , but do they also provide gain setting ???
  6. Replies
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    Closed: Re: Electromagnetic field sensing

    Thanks for the advice jiripolivka , i am going to build a 8-order butterworth active filter with a gain of 4 , connect Rx coil to it and do further testing as you have pointed out , and share the...
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    2,086

    Closed: Re: Electromagnetic field sensing

    I am trying to modulate the 25Hz high signal with 1Mhz , because i think since 25Hz is very low maybe 1Mhz will radiate out further and can be detected . I am planning to make another TX coil with...
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    2,086

    Closed: Re: Electromagnetic field sensing

    OK , in that case i should test my Rx coil again with a 8 order active butterworth or other type of opamp filter or just a RC low pass filter . I also wanted to test this circuit see attached . i am...
  9. Replies
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    2,086

    Closed: Re: Electromagnetic field sensing

    Hi BradtheRad, No i am not trying to light a bulb or charge something 8 feet away ,i just need to sense 25Hz from a distance of 8 to 12 feet away , i dont care even if its modulated RF i.e pulses of...
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    2,086

    Closed: Electromagnetic field sensing

    Hi All ,

    I need professional advice on a problem I am trying to solve . I am trying to sense electromagnetic field created by an iron-core coil from a distance of 12-feet. The Transmitter coil is...
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    Closed: Re: Low Pass Filter design

    Yes i think a p-channel MOSFET should do the job
  12. Replies
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    Closed: Re: Low Pass Filter design

    Basically i need to amplify signal picked up from a Rx coil . The pick up coil has the impedance of 2.4Kohm and its a AWG #44 wire wound air core coil . Actually i do need a pre-amp IC with AGC so...
  13. Replies
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    1,036

    Closed: Low Pass Filter design

    Hi All,

    I am trying to design and build a Low Pass Filter ( Active Filter with opamps ) . This will be the front end pre-amplifier as well as filter connected to a coil that will pick up 22hz to...
  14. Replies
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    1,625

    Closed: Re: H.264 verilog or VHDL code

    you want to understand the VHDL code ? i can help please upload the file
  15. Replies
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    977

    Closed: Re: Power op amp suggestions for a coil

    Hi ,

    I am not sure what should be the approach , i am trying to make a electromagnetic pulsing PIG or Inspection tool as a small project , these are used to inspect oil or gas pipelines and they...
  16. Replies
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    977

    Closed: Power op amp suggestions for a coil

    Hi ALL,

    I am not an expert in analogue design , and i need to design a power amplifier to derive a air-core coil made up of 40 awg wire to create a strong magnetic field , its total impedance is...
  17. Replies
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    2,738

    Closed: [Moved]DXP.exe of Altium stopped working

    Hi ,

    I was working on my PCB design project using Altium and To make matters worse my Altium Designer 10 has stopped working at all , i was getting some error messages in the past like memory...
  18. Replies
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    Closed: Re: Altium Multisheet PCB

    To make matters worse my Altium Designer 10 has stopped working at all , i was getting some error messages in the past like memory location violations , but i ignored them , and now it has stopped...
  19. Replies
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    Closed: Altium Multisheet PCB

    Thanks for the guidance , really appreciate it

    I have run into more errors , the errors come up when i compile my design . its says :
    [Error] TOP.SchDoc Compiler Duplicate Net Names Element[-1]:...
  20. Replies
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    Closed: Re: Altium Multisheet PCB

    here is what i see , without rooms enabled
  21. Replies
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    Closed: Re: Altium Multisheet PCB

    OK , i see them , so how do i define a square or rectangular area of my PCB ? with all the layers confined in that area .
  22. Replies
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    Closed: Re: Altium Multisheet PCB

    actually i am quite new to PCB design using altium , so please ignore my lack of knowledge . I did tried it , going into project options and disabling check boxes for "Generate room" and leaving one...
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    Closed: Altium Multisheet PCB

    Hi ,

    I have a Altium project with a Top level sheet . this sheet includes interconnected two sub-modules generated from separate schematic sheets e.g Sheet A and Sheet B .

    But when i try to...
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