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medium current audio op amp needed

Discussion in 'Electronic Design' started by [email protected], Dec 6, 2006.

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  1. Guest

    I am trying to make an audio amplifier using an op amp.

    The frequency in will be between 1000 to 2500 Hz.
    The power supply will be a single 12VDC from a wall-wart or a 9V
    battery.

    The output must drive Electro-luminescent wire with this frequency.
    About 1mamp.

    I have searched TI's website until I can't see straight anymore.

    I was an E-6 in the Navy as an ET, but that was eons ago and I can't
    remember how to read those data sheets like I used to.

    Any help would be greatly appreciated.

    Thanks.
     
  2. LM380 ?
    LM386 ?
     
  3. On 5 Dec 2006 22:40:48 -0800, in sci.electronics.design
    I think you need to look again a the voltage requirements
    http://www.elwire.com/faq/faq.html


    martin
     
  4. Eeyore

    Eeyore Guest

    Any audio power amp intended say for auto use should be fine.

    Graham
     
  5. Eeyore

    Eeyore Guest

    Do you actually mean 1 mA or 1 A ?

    Any old op-amp will give you 1 mA.

    Graham
     
  6. colin

    colin Guest

    It would be a neat trick indeed to get >100vac necessary to drive EL things
    from a 12 op amp.

    If its to drive via a transformer you need a bit more current becuase of
    magnetising current.
    best to look at a distributers catalogue, personally ive found farnell to
    have the overall best slection tables online.

    Colin =^.^=
     
  7. Mank

    Mank Guest

    Thank you all for replying with all this great info!

    My brother is the distributor for ELAM ( the inventor from Israel).
    ELAM's website @

    http://www.elam-lytec.com/faq-1.asp#faq2

    shows this:

    POWER AND ELECTRICAL FAQS
    What are the voltage levels are needed to operate LyTec®?
    Typically, voltage levels are 48-130 RMS, depending on the type of
    wire. However, the current drop is minimal, meaning it is possible to
    use either DC batteries via an inverter or direct connection (with
    proper precautions) to an electrical outlet.

    What is the maximum current that can flow through LyTec®?
    Yes. LyTec® supports a maximum current of 100mA.

    What is the typical current drop-through LyTec®?
    The typical current drop is in the magnitude of 1 mA/foot, depending on
    the combination of input voltage and frequency.
    <snip>

    So, yes, I would need to get the voltage up to about 120vrms at 1
    milliamp to the wire at about 2Khz.
    If I were to use a 10:1 xfrmr and the op-amps output drives the
    primary, the op-amp would probably need to deliver about 12 vrms (a
    15VDC Vcc?) at about 12milliamps. Does that sound about right?

    Thanks again!
     
  8. I dont see why you need an opamp, why not use a 555 timer chip, that
    will deliver some 200mA into your transformer. This will be probably
    more efficient as well


    martin
     
  9. Mank

    Mank Guest


    Hello Martin!

    Thanks for the suggestion. You are probably correct.
    I am just trying to use an audio signal source to drive the EL wire.

    I need to get that audio up to the required voltage/current levels.

    Since this is analog, and it must be for this application, I don't need
    the 555.
    I am a true TTL fan myself, but I need an amp at this point and not a
    multi-vibrator.

    Thank you very much for responding!!! Every idea is welcome!!!

    John
     
  10. Mike

    Mike Guest

    How about using your power opamp to drive the low impedance winding of an old tube type audio output
    transformer and take your HV AC drive from the high impedance winding? A power transformer might work, but
    maybe not to 2500Hz. Use an LM386 if you need very low power or something like an ST Micro L165 for higher
    power output.


    Mike


    "The scientist is possessed by the sense of universal
    causation...His religious feeling takes the form of
    rapturous amazement at the harmony of natural law,
    which reveals the intelligence of such superiority
    that, compared with it, systematic thinking and acting
    of human beings is an utterly insignificant reflection."
    Albert Einstein (theoretical physicist)
     
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