Amplify a 400mV peak ten times

Discussion in 'General Electronics Chat' started by gusmas, Oct 3, 2009.

  1. gusmas

    Thread Starter Active Member

    Sep 27, 2008
    239
    0
    which op amp would be suitable to amplify a 400mV peak signal ten times, i thought about using a transistor but it takes to long to get the transistor amp to work perfectly
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    What is the frequency range of the signal you need to boost?

    hgmjr
     
  3. kkazem

    Active Member

    Jul 23, 2009
    160
    26
    You can probably use an LM358 or LM324 op-amp. There are several specs you are leaving out and therefore I can't help you more unless I know what you need. Like, is the input and output voltage DC and if so, are they both required to be positive? If your input is AC, can you tolerate an inversion in the output signal? What power supply voltage(s) do you have available or is this to be a battery operated unit? What bandwidth do you need? What gain accuracy do you need? Although it's not a complex problem, there is more to it than you might expect. It's always better to get these details out in the open before breadboarding. Also, I highly recommend that you simulate the circuit first to ensure that your output will give you what you expect. There is a great free spice simulator with no node limit and no time limit that's better than the ones they charge thousands of dollars for. It comes with a free schematic simulator and post prossesing graphic tool and has great documentation. Do a google search for LTSPICE or go to the Linear Tecchnology Corp website and put LTSPICE in for the search term.
     
  4. gusmas

    Thread Starter Active Member

    Sep 27, 2008
    239
    0
    its an ac input, i can tolerate phase shifts,the signal can lose its shape i am not going to use it again, after the the 10 gain amplifier i am going to rectify it to a dc voltage., well i don't have a restriction on supply voltages, the freq it should work anything from 0 Hz to 5kHz.
     
  5. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    What are you planning to do with the derived DC from this circuit?

    hgmjr
     
  6. gusmas

    Thread Starter Active Member

    Sep 27, 2008
    239
    0
    Feed it into a pic axe and store the dc value in a variable. So what op amp do you guys reccomen
     
  7. meorbu

    New Member

    Oct 6, 2009
    5
    0
    I think not enough current to drive the PIC... Better use AC to DC converter..
     
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