There was a discussion on this board, about using LED(s) for brute-force jamming. The main issue was "can we pulse a LED at 2MHz or more".
To make a long story short, this is not really a problem.
This is the equipment I used:
- a TGP100 10MHz pulse generator
- a LeCroy WaveJet 354A oscilloscope
- a TSHF5210 IR LED (890nm)
- a 10 ohm smd resistor
- some BNC connectors and RG58 coax cable
close-up of LED + resistor
LED pulser with oscilloscope probe connected over 10 ohm resistor
Schematic of test setup
1MHz pulse frequency @ 50ns
2MHz pulse frequency @ 50ns
5MHz pulse frequency @ 50ns
10MHz pulse frequency @ 50ns
50ns pulse closeup
The voltage over the 10ohm resistor is around 1.5 volts, this equals to 150mA current through the LED. This can be done even at 10MHz....
This lab-setup jammed my JenOptic at 100ft.
I am building a MOSFET based pulse amplifier to increase the current through the LED, and find out where the LED will destroy itself. I expect to be able to generate pulses around 1-2 Amp, but this will surely destroy the LED. Lets find out how far we can go.
(my)Conclusion until now is that LEDs can be used for brute-force jamming!