Microvolt DC Amplifier

Discussion in 'Power Electronics' started by styven, Jun 2, 2016.

  1. styven

    Thread Starter New Member

    Jun 1, 2016
    21
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    Good morning-)
    would love to have some info about circuit microvolts output from 2 microvolt to 20 microvolt, and i would to clinch the microvolts I want, also with adjustable intensity..! ! thank you!!
     
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    For a power supply, for a signal source, for ???

    Also, if you would take a 10k ohm resistor from a 9V battery (+), and then put, in series with resistor, a 1 meter long piece of 20-gauge wire from resistor to ground (battery -). Then about every 3cm from ground, you will have 1 microVolts.
    - At 9 cm, 3microV,
    - at 60 cm you'll have 20 micro volts.

    In this circuit, the 20 gauge wire is a very low resistance resistor and, essentially, a potentiometer as you tap into different positions on the wire.

    The wire doesn't have to be exactly 1 meter, but in the range of 70 to 100 cm so you can get your 0-20 microVolts.

    Good luck.
     
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  3. ScottWang

    Moderator

    Aug 23, 2012
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    op07 ...
    LF356, LF357 ...
    NE5532 ...

    1M, 100K, 10K, 1K, SVR-100Ω, choose the resistors you want and in series them to become a voltage divider and connecting to the op amp then you can get a small voltage.

    What would you like to do?
     
  4. styven

    Thread Starter New Member

    Jun 1, 2016
    21
    1
    Hello friends elektro-) ..I want say thank you very much for your attention with surprising but unfortunately I can not construct, but it would be feasible to draw me this project to construct my friend.-) thank you !!
     
  5. ian field

    Distinguished Member

    Oct 27, 2012
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    A circuit has been floating around since the beginning of transistors that runs from a single 1.4V cell.

    3 transistors directly coupled - the collector of the first to the base of the next and so on.

    The first transistor has a collector load of a few tens of k, the second about 10k and the thirs about 4k7 or less. The last collector is fed back via a few hundred k to the first base, that gives DC nfb to stabilise the bias point of all 3 transistors. The total resistance between the final collector and first base is split, the tap is shunted to GND by a capacitor to block AC nfb.

    The circuit works better with the old germanium transistors, but silicon transistors work just as well if you run it off a 3.6V lithium coin cell.
     
  6. #12

    Expert

    Nov 30, 2010
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  7. styven

    Thread Starter New Member

    Jun 1, 2016
    21
    1
    Good morning-)
    i want say thanku to AAC Fanatic member for the File..
    but i prefer if there some one to build that for me!!
    any proposal we can talk..thxs!!
     
  8. styven

    Thread Starter New Member

    Jun 1, 2016
    21
    1
    Hello-)
    Dear Fanatic, everythink ok with circuit, i think working very well, we testing every day, can you draw me or you can simplify the circuit, what will put the ground on the ground, and that will make cutting the circuit to get microvolts? please i will be happy to see your design! ! ! how you make for example...-)
    Thank you..
     
  9. styven

    Thread Starter New Member

    Jun 1, 2016
    21
    1
    Fanatic or someone to answer for me, where i can put somethink for the noise? for example op-amp and where i can put that circuit beacuse it is very sensitive.
     
  10. tcmtech

    Well-Known Member

    Nov 4, 2013
    2,034
    1,652
    More importantly, What exactly are you doing with this circuit where you need 2 - 20 microvolts?

    What is the end purpose of the design?
     
  11. ScottWang

    Moderator

    Aug 23, 2012
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    Do you feel like in the fog?
    It was close to three weeks, If the TS still doesn't want to describe more clearly, do you think this thread should be close, so it won't waste time for helper?
     
  12. styven

    Thread Starter New Member

    Jun 1, 2016
    21
    1
    Good morning-) it is hobby-) personal hobby!!
     
  13. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    If you would bother to close this one for risk of wasting helper's time, then there should be hundreds of threads ahead of this one in line.
     
  14. styven

    Thread Starter New Member

    Jun 1, 2016
    21
    1
    Fanatic Good evening-) your project working, i was testin a lot of times, there is a little promplem with noise, what is your opinion for that? and what potentiometer to put there to make different positions?
     
  15. ScottWang

    Moderator

    Aug 23, 2012
    4,853
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    If I close this kind of thread, that is for temporarily and to push the TS to attach the circuit or describe the questions more clearly, also it needs at least two helpers agree to do that, otherwise this thread already closed, if we meet the TS don't want to do what he should do, do you have any good suggestions?
     
  16. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Maybe he is busy or doesn't want to share the details of his new invention. It happens all the time here. Today he said he is using the solution I proposed. If he has a solution that is mostly working, why are you threatening to close his thread? Is there a new rule that says he is obligated to respond with more information to other helpers who are only asking more questions or proposing additional solutions?

    I'm sorry if you think his question needs to be asked more clearly. I don't always understand my wife but on those days her girlfriends seem to understand her. I don't lock her out until she is able to make me understand.
     
  17. Papabravo

    Expert

    Feb 24, 2006
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    “Never argue with an idiot. They will only bring you down to their level and beat you with experience.”

    George Carlin
     
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  18. ScottWang

    Moderator

    Aug 23, 2012
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    You made a mistake for the date and time.
     
  19. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    It depends on the TIMEZONE. All was right from here.
     
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