Both about the same - they might have a range of a few cm.
Consider that cell masts can detect cell phone radiation from about 20Km away and you will understand they are not at all efficient!
Brian.
I suspect that cell phones used in India and Pakistan in the You Tube videos posted use different radio frequencies than cell phones use in The West.
Of course an LED has polarity, it is a light emitting DIODE!
The diodes must be high speed 1N4148, not slow 1N400x used for 50Hz and 60Hz.
The large part inside an LED is the negative (and the case has a flat on its rim) like this:
Light Emitting Diode = anode and cathode
Anode towards positive voltage, cathode towards ground.
You can test the LED with a 3V battery such as a coin cell to see which pin/lead is the anode and which is the cathode (it will light up right way round), if the LED is not a typical dome-shaped LED with a flat bit at the back of the 'dome' denoting cathode side, and the cathode side lead is slightly longer.
Of course an LED has polarity, it is a light emitting DIODE!
The diodes must be high speed 1N4148, not slow 1N400x used for 50Hz and 60Hz.
The large part inside an LED is the negative (and the case has a flat on its rim) like this:
I do not know which diodes you have. They might not work at cell phone radio frequencies.
Here is another photo of an LED:
I can't see any attachment.
1N4148 usually has the characters printed on it. I have never seen one with blue and brown bands around it but as long as it is an ordinary high speed signal diode it should work anyway.
Brian.
Nope. All LED datasheets and my photo in post #12 show that the cathode lead is shorter.the cathode side lead is slightly longer.
Nope. All LED datasheets and my photo in post #12 show that the cathode lead is shorter.
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