As part of my research, I do experiments with rodents (rats). I train rats to do a number of tasks that allow me to ask them how they perceive odors. Rats like to work in the dark and I monitor them with an IR camera. As a cheap IR camera, I bought an Agama V-135R cam with built-in IR LEDs. However, one annoying thing about this camera is that the IR LEDs must be turned on via software and are programmed to shut off every 45 mins. I just want them to be on all the time! So I opened up the camera and found a way to keep those guys glowing! The LEDs were wired as two garlands of 2 leds plus a 50 Ohm resistor. This makes sense:
USB Vcc = +5VDC
IR LEDs drop = ~1.75 V Each
Leaving 1.5 V dropping over R=50 Ohms --> I = 30 mA
The two garlands go to ground through a transistor. I simply shorted the transistor with a fine copper wire!
USB Vcc = +5VDC
IR LEDs drop = ~1.75 V Each
Leaving 1.5 V dropping over R=50 Ohms --> I = 30 mA
The two garlands go to ground through a transistor. I simply shorted the transistor with a fine copper wire!
It works!!
ReplyDeleteMay I know how to short the transistor with a wire? Thanks!
ReplyDelete