How do you calibrate it once you have it built?
A few years ago I ran into an EE friend who was returning to the
college from a purchasing expedition. He said that he was picking up
a "constant voltage source" -- alkaline batteries. It used to require
mercury cells, probably no longer available.
Roger
On 11 Oct 2009, at 6:18 PM, ADavidhazy wrote:
I'd say in the build it yourself scheme ... avoid 110 or 220 like
the plague - you can get an unpleasant shock! . Use high intensity
LEDs if at all possible. These can be run from batteries. I don't
know about their output vs. drop in voltage but they consume little
power and should provide a fairly steady output. You can get them at
Radio Shack. You can also get a CdS photocell there.
BTW, the calibrated Stouffer wedge may be expensive. I have not
checked price myself though.
cheers,
andy
PhotoRoy6@xxxxxxx wrote:
In the US to get 220 volts you just run two hot lines to the
electrical outlet. Some clothes dryers and other machinery use to
run on 220 volts in the US.
Roy
