2399 echo on +1.5v?

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I found an electronic echo karaoke mic at a thrift store - 2399 delay built into the mic. It just has a repeats knob, no delay time or wet/dry mix.

Shouldn't be much work to make it into something fun ALA the fab echo mods.

Weird thing is that it runs off of a single AA battery. Looking at the 2399 datasheet, the only mention of voltages is in the example circuits, which are labeled with +5v... Says nothing about what range is acceptable.

It is all surface mount, but the only ICS on the board are two 4558 dual op amps and the 2399 - no charge pump that I can see.

Is it possible to run 2399 on only 1.5v?

I am sort of wondering if I could try to run it on something higher - it seems to distort really easily as it is now. Maybe try getting it up to 3 AA batteries or something. Don't want to fry anything though.

[anchovie]

Never mind the 2399, there must be something stepping up the voltage otherwise those 4558s wouldn't be doing anything! NJU datasheet specs minimum supply as +/-4V, TI recommends a minimum of +/-5V.

[slacker]

The data sheet recommends a minimum of 4.5 volts for the PT2399 http://www.princeton.com.tw/downloadprocess/downloadfile.asp?mydownload=PT2399_1.pdf, that doesn't mean it won't work with less though. Like James said the opamps will probably need more than that though. Try measuring the voltage at pin 1 of the PT2399, that will tell you what the supply actually is.

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"Measure the voltage."

You guys have such novel ideas. 

[Perrow]

That's a face-palm if I've ever seen one