current amplifier

Discussion in 'The Projects Forum' started by balaji selva, Nov 29, 2013.

  1. balaji selva

    Thread Starter New Member

    Nov 29, 2013
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    friends....i have a small requeat for u all... i need little help for my project...

    i used op-amp 741 based instrumentation voltage amplifier to amplify a square wave of 0-10mA and 1Vpp....

    the voltage got amplified to about 10V....current is 0-20mA

    (my need is a current of 0-120mA and voltage above 2V)

    can u please suggest a good current to voltage convertor or any current amplifier for my project...please reply soon
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    What load will the circuit be driving? It's unusual to specify both a current and a voltage.
    A resistor is an excellent current-to-voltage converter ;).
    If you have 10V available from the amp it can be applied to the gate of an NFET to control >>120mA.
     
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  3. balaji selva

    Thread Starter New Member

    Nov 29, 2013
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    sorry...my mistake i need to convert the voltage to current my friend...i.e that 10v to 120mA...can u give any of your simulation circuits
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    This will convert 0-10V to 0-120mA, provided you use a rail-to-rail opamp (not a741).
     
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  5. balaji selva

    Thread Starter New Member

    Nov 29, 2013
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    thanks pal...can u suggest a good rail to rail opamp for this circuit
     
  6. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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  7. balaji selva

    Thread Starter New Member

    Nov 29, 2013
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    thanks my friend:):):):)
     
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