Diode voltage drop...
Anand Dhuru email (remove spam text)
Would using chargeable cells be an option? 3 of these either in AA or AAA
would give you 3.6 volts, you would not have to worry about the voltage drop
at all. Of course, you might have to provide a charger with each unit.
You could make it sound like a plus feature rather than a work around!
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See also: massmind.org/techref/power.htm?key=voltage