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Figure 20 - A rechargeable lead acid security battery will power the LED array
Figure 20 - A rechargeable lead acid security battery will power the LED array

Depending on how much infrared radiation I needed, the lead acid security battery shown in Figure 20 would run the array for times between 30 minutes up to several hours. To limit the current and run time, I used several methods, depending on the installation. Simply adding a resistive load would work, but there was some loss due to heating. A better solution was to create a pulse width modulated power supply that would allow the duty cycle to be varied. This worked well when precise control over brightness was necessary. The modulated power supply was based on the "pulsed LED illuminator" circuit shown earlier, but used an array of larger FET transistors as the drivers.



Figure 21 - The completed super stealthy giant infrared LED illuminator
Figure 21 - The completed super stealthy giant infrared LED illuminator

The completed stealth installation is shown in Figure 21, and turned out very well. The one way glass mirror is a bit more reflective that the original LCD panel, but the device still looks perfectly convincing. Only an evil genius would suspect an innocent looking LCD monitor of being a giant high power night vision illuminator, so the device was a total success in every operation it took part in. The infrared radiation thrown from this giant 1536 LED array was so intense that I usually ended up running the LEDs at less than 50% of their capacity to light up a large room.

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