> a +/-9v battery supply will work

There's probably nothing too fussy about 9 or 10. Maybe they've
chosen 10 for maths, or a recommended supply

Once the novelty of replacing batteries wears off it'll end up unused.
It would be much better, and more economic, to use a transformer
or AC wallwart for a long-life stable voltage

RS have +/- 12 and +/- 15 DC/DC converters. No +/- 10 seen

http://newzealand.rs-online.com/web/c/power-supplies/power-supplies-inverte=
rs-dc-dc-converters-generators/dc-dc-converters/?sort-by=3Ddefault&sort-ord=
er=3Ddefault&applied-dimensions=3D4294880637&lastAttributeSelectedBlock=3D4=
294958691

Reasonable at 10s of mA, gets pricey over 100mA, and you need
a DC source

For the price you could put together a chassis-mount transformer,
bridge and regulators and get exactly what you want

Joe=20

--=20
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