I skimmed the first article and can see your points. Not sure what is "opt"-coupling; I could understand "opto"-coupling much better. Furthermore, wavelength tuning... I have a hard time that just the red LED will produce enough to stimulate a solar cell to any major degree as stated.?
?
The article also starts out early on with the statement, "However no practical devices were developed in their works." One could probably see why; this is like a cold-fusion paper.
From:[email protected] <[email protected]>
On Behalf Of wn4isx via groups.io Sent: Monday, November 25, 2024 1:01 PM To:[email protected] Subject: Re: [electronics101] Extraordinary claims require extraordinary proof
?
Sigh, one of these days I might actually learn to type.
Yes I meant opto.
The point that worries me is the IEEE has an entire series on this concept.
I took a super bright red LED and placed it in direct contact with a "Large area Silicon Sensor features a 0.25" square silicon solar cell mounted in a pale yellow
see-thru dome. Output at noon in full sunshine is open circuit voltage 0.55V and short circuit current is 2.5mA. Brand new with long leads. "
?
?
And got about .1V @ no measurable current. I used an IR LED with zero V out.
?
I want some of his magic photo voltage thingies....
?
?
A friend bought a bunch for a project and I'm playing with an active solar tracker
I was starting to think the same thing. Throw a few concepts and let AI do the rest. Though it has been shown that AI generated technical papers are about 10% probable. I forgot the where I found that article, but it was about a month ago it came across my viewing.
This doesn't look that great to me.? The alpha
gain is interesting but comes with some problems.
1] The alpha gain is only with a shorted output (very low
impedance), so the power gain is very low.
2]? A transistor has about the same input impedance (low forward
biased diode but variable depending on the base/emitter internal
resistance times the current gain) as the LED unless they're
colored light (not infared) that have higher voltage requirements
to light.
3] The big advantage of the transistor is that the output
impedance is very high relative to the input impedance.? I.e.,
it's more of a constant current device so now the power gain is
magnified by the current across a higher resistance load.? Solar
cells are limited to about 0.6V max voltage gain because they are
forward biased diodes that go into conduction if you try for more
voltage than that.? You're going from a low impedance input to a
low impedance output.
4]? They would be poor photoresistors because most photoresistors
are really resistors that vary in resistance, even with tens or
hundreds of volts across them that can be AC or DC.? Solar cells
will not perform nicely if trying to control AC voltages due to
being essentially large area diodes limiting the voltages to less
than about 1/2 volt AC.
Interesting idea for a thought experiment, but I don't see it
being particularly practical.
Regards,
Charles Patton
On 11/25/2024 4:11 PM, wn4isx via
groups.io wrote:
Derek Koonce