I want to convert 3mv output to 5 Volts

Discussion in 'The Projects Forum' started by Sankalpsood, Jan 19, 2016.

  1. Sankalpsood

    Thread Starter New Member

    Jan 19, 2016
    I am making a project to use seabeck effect to run a 5 volt motor to run a fan.
    But the problem is that , the output voltage by Seebeck effect is around 3 millivolts. So I basically need a circuit or a device to amplify that to 5 volts.
    Help me out please.
  2. Sankalpsood

    Thread Starter New Member

    Jan 19, 2016
    That is 5 volts not brother.. #sorry
  3. bertus


    Apr 5, 2008
  4. Sankalpsood

    Thread Starter New Member

    Jan 19, 2016
    not any op amp circuitry can work?
  5. crutschow


    Mar 14, 2008
    It can certainly amplify the voltage but the op amp power must be supplied by external power supplies
  6. profbuxton


    Feb 21, 2014
    Just use a thermocouple amplifier. Standard product available from instrument companies. Will output 4 to 20 ma or 1 to 5 volts(or other)
  7. Papabravo


    Feb 24, 2006
    Amplifiers cannot make something out of nothing. The power, in watts, produced by ANY circuit is always less than the power in. Sometimes it is much less. Just to throw out some numbers let us assume that your device can produce 3 mV @ 100μA. The power input is 300 nW. Let us say we achieve the incredible efficiency of 80%, the power out will be 240 nA. This power level at 5V will result in an output current of 48 nA. I can tell you that that amount of current will NOT be able to turn a fan.

    This idea is not dissimilar to the idea of harvesting "free RF energy" from our surroundings. They are both tasks of monumental futility.
  8. Picbuster

    Well-Known Member

    Dec 2, 2013
    look at the TL site or microchip use 3 x mcp6n11 3mV in last stage 5V out but you have to use a noise free pwr supply.
  9. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    POWER is a product. It can be estimated by multiplying a voltage and a current.
    The product is called watts or volt-amperes.
    IT CANNOT BE INCREASED by amplification.
    Volts can be increased but current will decrease.
    Current can be increased but volts will decrease.
    Always, if you multiply, the two you will get the same answer.
    POWER cannot be increased by an electronic circuit of any kind.
    To increase power, more power must be added.
    Consider your stereo. The audio signal you put in the back panel is not capable of moving a speaker cone. The signal coming out is much more powerful.
    Look at the wall socket where the amp is plugged in and tell us where this increased audio power comes from.
    Papabravo likes this.
  10. Papabravo


    Feb 24, 2006
    Think of an amplifier as an electronic copy machine. It makes a copy of a low level signal by using the power from the wall socket. As always the power out will be less than the power in.
  11. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    If you place 1,667 thermoelectric devices in series you will obtain your desired voltage without amplification.

    Good luck getting any appreciable current out of it.
    GopherT likes this.
  12. tcmtech

    Distinguished Member

    Nov 4, 2013
    Well if they are configured as a common 12 volt 50 watt or larger Peltier unit 5 volts at a few hundred milliamps or more would no be hard at all.