>> And then I walked back into the shop and bought some batteries. Because,

>> batteries is pretty much a normal price really.
> 
> The next thing you should build is a dual voltage power supply.

Uh, why?

1. If I actually wanted one, I could *buy* one for a very modest price. 
(And that way, it would actually work properly.)

2. I don't know how many amp-hours an AA battery is, but with each IC 
using several micro-watts of power, I don't envisage running them flat 
any time soon.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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