How to step up the voltage

Discussion in 'General Electronics Chat' started by brownhall, Apr 20, 2009.

  1. brownhall

    Thread Starter New Member

    Apr 20, 2009
    1
    0
    Hi Folks,

    What circuit or components can I employ to step an output voltage up from 0.01V DC to at least 0.7V DC to turn on an LED using it as an indicator.
    Sincere thanks,
    brownhall
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    I might suggest applying the 10 mv signal to an op amp for the gain, and the using a voltage comparator to drive the LED (700 mv is not enough to forward bias a LED).
     
  3. steinar96

    Active Member

    Apr 18, 2009
    239
    4
    Brownhall, what you're asking for can be obtained with an op-amp amplifier circuit. But keep in mind that the op-amp can not "create" voltage so you would require a voltage source connected to the op-amp to provide a voltage higher then the output voltage (0.7V) you are looking for.

    If you're asking about passively increasing the 10mV signal to 0.7V without external sources you're in a bit of a trouble. The signal would have to be AC to step it up properly and stepping 10mV to 0.7V is alot of gain and even then the power output might not be enough to drive the led.
     
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