Does an amplifier have a max gain ?

Discussion in 'The Projects Forum' started by simeonz11, Jan 8, 2010.

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  1. simeonz11

    Thread Starter Active Member

    Apr 29, 2008
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    For this current project of mine , I need to amplify an ac sine wave +-0.5v(1vp-p) . It is a pure sine wave by all means and perfectly symetric + and - etc ... I wont be dealing with anything but a pure sine in the audio range .

    I wish to amplify this to a maximum of +-24 volts . The opa604 .

    http://focus.ti.com/paramsearch/doc...null&appId=null&viewDeviceCallingPage=null#rt

    Now I have located an op amp that seems to suit my needs , my question is the following .


    Can a 50 or 100x gain of such a small signal be amplified precisely at +-24 volts with a single op amp , or do I need 2 x op amps .

    Does open loop gain mean max gain of an amplifier , all datasheets have a max open loop gain and a minimum gain , but there is no talk of maximum gain in closed loop .

    Also , if this op amp is specified for +-24 volts , will it do harm if I use 2 x brand new 12v batteries , I know these can reach 13.8 volts when new , so +- 27.6

    thx .
     
    Last edited: Jan 8, 2010
  2. beenthere

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  3. SgtWookie

    Expert

    Jul 17, 2007
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    OK, wait a minute...

    Do you mean one battery for a Vcc of 13v and another for a Vee of -13v giving a total 26v?
    Or do you mean you're using four batteries; two for a Vcc of +26v and two for a Vee of -26v?

    And what kind of output current are you expecting to get out of this amplifier?
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
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    You will most most probably damage your your circuit if the power rails exceed 25 volt. From the data sheet we can also read that then the power supply is +/-15 volt the highest output voltage will be somewhere between 11 and 12 volt (+/-) with a 600 ohm load. If you use a +/- 24 volt power supply the output voltage will be around 20 volt maximum. But this will depend somewhat on the load. Anyway you will never get +/- 24 volt output swing with this circuit.
     
  5. beenthere

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