Lee Leduc said:
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.
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.
, 9 Volt no problem. (I made a few mike
