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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by maduba

  1. M

    DC analog signal

    Hi, I would like a advice on how to filter out the DC analog signal that comes out from analog multiplexer. It contains noice kind of spike. I very much appreciated if you could reply me back soon as possible. Thank you
  2. M

    sigma delta adc

    But U10 is -15V to +15V rail. does it not needed attenuate to +5V because sigma delta adc +5V.
  3. M

    sigma delta adc

    thank you for the reply. I am bit confused here. So this U12B is not needed for input to the sigma delta ADC. The output coming from U10 can be connected sigma delta adc is that right?
  4. M

    sigma delta adc

    Thank you all for the reply. do you think we need U12B for threshold comparator for input of the sigma delta adc. because in this circuit is adding offset on the U15.
  5. M

    sigma delta adc

    Thank you for the links. Would that circuit viable to use for measuring.
  6. M

    sigma delta adc

    Thank you for the reply. I need to measure the resistance in megaohms. Its constant DC. It is always in one direction.
  7. M

    sigma delta adc

    Thank you for the reply.I meant Megaohms to measure
  8. M

    sigma delta adc

    Thank you for the reply. Since this is going to be low current measurement. Does U15 Reference voltage needed because the offset creates errors on the output of ADC. Am I correct about this.
  9. M

    sigma delta adc

    I don't know the value of it but probably in the order of magnitude of 1.8 MΩ
  10. M

    sigma delta adc

    I wanted to measure the current of a sense resistor which will be in mili amps.
  11. M

    sigma delta adc

    Yes there are no comparators in the first schematic. I wanted to use this circuit as a low current sensing. And feed the output to sigma delta adc (MCP3553). Looking at the circuit I dont think I need U12B. Can I just use the output of the U10 and feed it to sigma delta ADC input(MCP3553)
  12. M

    sigma delta adc

    Thank you for the reply. This is very helpful. this is the article about this circuit. https://www.analog.com/en/analog-dialogue/articles/fully-automatic-self-calibrated-conductivity-measurement-system.html I dont think I need U12B. Can I just use the output of the U10 and feed it to sigma...
  13. M

    sigma delta adc

    Thank you for the reply. I am trying to understand this circuit. This circuit to be use as low current amplifier.I dont get why 1.65V is applied as a reference for the U15. What I understand is 1.65V added as offset of the output voltage. Please correct me if I am wrong. Thank you
  14. M

    sigma delta adc

    Please see the attached circuit. Can this be circuit connected to sigma delta adc. Does the reference voltge of the sigma delta adc needs to be the same as the comparator input 1.65V. I highly appreciated if you could give me idea about this. Thank you.
  15. M

    filter realization help

    Thank you for the reply. This is a decimating filter. Thank you very much about the explanation about cof[0].It is clear for me. I have a another question. This is also part of code and related. I dont understand how this works. I dont understand why mac function called twice.
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