🚀 go-pugleaf

John Woodgate wrote:

> [snip] Furthermore, 1.09 V is not really enough voltage to
> operate a simple electronic constant-current circuit.

Not true.  Here's one that's not that complicated and runs a 3.5V white 
or blue LED off 4 AA Ni-Cds of from 3.8 to 5.6V depending on their state 
of charge.  As he says, it requires only 0.2V more than the LEDs.  I 
modified the circuit to use a single LED, and changed the power FET to a 
2N4401, plus some other circuit resistance changes.  I get substantially 
the same results.  Regulation is within about 6 percent; not great but 
good enough.

http://radiolocation.tripod.com/LEDdimmer/LEDlampDimmer.html

What I'm trying to do right now is boost the current enough to drive 
four or more output transistors in parallel for four or more LEDs.  I 
may go back to the really inexpensive MOSFET 2N7000 for the output 
device, since they draw zero gate current, so I can drive dozens of them 
  as in the original circuit at this URL.  The only disadvantage is that 
neither lead of the LED is grounded.


-- 
----------------(from OED Mini-Dictionary)-----------------
PUNCTUATION - Apostrophe
Incorrect uses: (i) the apostrophe must not be used with a plural
where there is no possessive sense, as in ~tea's are served here~;
(ii) there is no such word as ~her's, our's, their's, your's~.

Confusions: it's = it is or it has (not 'belonging to it'); correct
uses are ~it's here~ (= it is here); ~it's gone~ (= it has gone);
but ~the dog wagged its tail~ (no apostrophe).
----------------(For the Apostrophe challenged)----------------
 From a fully deputized officer of the Apostrophe Police!