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Single supply (9V) audio opamp suggestions?

Discussion in 'Electronic Design' started by Lee Leduc, Jul 15, 2003.

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  1. Lee Leduc

    Lee Leduc Guest

    I'm looking for an opamp similar to a 5532 that I can operate using a
    single 9 volt battery for the power supply. I use 5532's for general
    audio circuits but my datasheet recommends a minimum supply voltage of
    10 volts for this device.

    Anyone know of a good low voltage opamp for audio aplications? BTW, a
    deviced that is second sourced would be nice.

    Thanks.
     
  2. Audio amps are not single supply. You will need to split the supply
    (+/- 4.5V) or invert it (+/- 9V) to create a signal ground.
     
  3. roma

    roma Guest

    and enough power to drive 8 ohms speaker loud ans clear . get dtata
    sheet from National semi.
    roma
     
  4. gregS

    gregS Guest

    I know an OPA234 has been used in a 9 volt application. Its
    not bipolar however.

    greg
     
  5. It depends a bit on what you're trying to do. 9v is a bit of an awkward
    voltage because many of the newer opamps are designed for the 3v or 5v range
    and won't go up to 9v; the older ones, as you know, are often designed for
    at least +/-5v, that is, 10v single supply.

    Don't fret too much about the rated supply voltage. You can actually get
    decent audio performance out of even those ones rated for at least 10v, on a
    9v battery. It's one of those things where the manufacturer won't promise
    it but hundreds of thousands of audio devices have proven it does work.

    The TL062 is probably the most common opamp that I encounter for 9v audio
    work. It has the advantage of very low supply current. It is, however,
    very noisy and has crappy frequency response - that's the tradeoff. For
    better sound at the expense of more supply current, the TL072 is a good
    opamp. The LM358 has also been widely used for 9v audio, although it does
    have some shortcomings.

    Note that both the TL062 and TL072 have improved versions, the TLE2062 and
    TLE2072 respectively, with better specs. The TLE2072 uses 1.8mA per
    channel, is rated for supply voltages as low as 4.5v (single supply!), and
    has a 10MHz gain bandwidth. I've used it in a number of battery-powered
    audio applications with good success.

    As GregS points out, the OPA2134 is a truly excellent opamp, and is rated
    for 5v single supply. It does consume 3 times the current of the TLE2072,
    though.
     
  6. Lee Leduc

    Lee Leduc Guest

    Thanks for the replies everyone.

    I looked at the OPA2134 and thought about trying it out. Just wanted
    to see if anyone had any firsthand experience with it.

    I mentioned 9 Volts because it's the supply voltage available to me. I
    can always reduce it to 5 volts with a regulator and create a virtual
    ground with a voltage divider and a voltage follower.

    What I don't want to is use a DC/DC converter to generate a +/- supply
    or a charge pump to create a -9volt supply.

    PS. sorry about any misspellings but I'm trying to get used to my
    first set of bifocals <grin>.


    On Tue, 15 Jul 2003 14:19:40 -0700, "Walter Harley"
     
  7. René

    René Guest

    I 've had lowly 1458's working quite satisfactory on 5 V single (only
    ~ 2 V p/p out, mind you:), 9 Volt no problem. (I made a few mike
    preamps using this amp (+ transistor "frontend" to get good noise
    specs) running of a single 9V battery)
     
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