Single Supply Op Amps

Discussion in 'The Projects Forum' started by Mick84, Feb 24, 2015.

  1. Mick84

    Thread Starter New Member

    Feb 8, 2015
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    Hello
    I've hit a stumbling block with this A weighting circuit needing +/-15ac for powering the op amps.
    No good to me with a portable 5v dc Arduino supply and not much 'headroom'.

    [​IMG]
    I have found Single Supply Op Amps (SSM2135 @£5 a pop) I am wanting to use in place of the dual supply op amps shown.
    Do you think it will work in it's current design?
    What changes am I likely gonna have to make?
    I will attach the OpAmp datasheets for reference.

    Regards,

    Mick

    [​IMG]
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. Mick84

    Thread Starter New Member

    Feb 8, 2015
    12
    0
  4. Mick84

    Thread Starter New Member

    Feb 8, 2015
    12
    0
    I have uploaded the datasheets, hope you can see them now...
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,638
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    Hello,

    That circuit is to be used on dual powersupply, as there is a ground reference.
    If you want to use it on single powersupply, you will need to create a virtual ground.

    Just have a look at fig37 of the smm datasheet.

    Bertus
     
    Mick84 likes this.
  6. DickCappels

    Moderator

    Aug 21, 2008
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    Incidentally, the only difference between a single supply opamp and most other opamps is that they are referred to as "single supply", usually because both their inputs and outputs can work pretty close to the supply rails. No need to spend £5 on an opamp unless you are looking for some expensive performance (noise, slew rate, etc.).

    Some inexpensive opamps you might consider include the LM324/LM358 (TI old but still good for some things), LMR321G (Rohm), LMV321 (ST Microelectronics), NJU7051 (New Japan Radio Company), TLC27L2 (TI), TLC2272 (TI), TLC272CP (TI), TLC2201 (TI), TLV2771 (TI).
     
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