I bought a pair of 1st generation Seben binoculars and am curious as to what causes the whine when they are active. I understand the principle behind how they work, but what causes the whine?
I have night vision stuff because I like nature and I like gadgets.

Image intensifier tubes require a high voltage source to operate. I'd guess your binoculars use something like a high frequency flyback transformer to provide that voltage.

Hunting hogs in South Texas with a Gen 3 night vision scope and suppressed (silencer) .44 mag. New video recorded September '09. Click on other videos from "NightHogsDotCom".

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• USB interface, no external power supply needed
• 6 bright white LEDs for night vision
• Plug & Play compatible
• No built-in microphone
• Heavy-duty clip w/ foam pads, will not scratch surfaces it's mounted on

Product Description
Connect with your world day or night using our Webcam with Night Vision. 6 LEDs will illuminate the darkness, and a high-resolution color sensor provides 24-bit true color. Twist the lens to focus it for an incredibly clear picture. Great for Skype, ICQ, AIM, MSN, or net meetings!
Please note, this camera model is not compatible with Yahoo, and has no built-in microphone.... More >>

USB 3 LED PC Webcam Camera plus + Night Vision MSN, ICQ, AIM, Skype, Net Meeting and compatible with Win 98 / 2000 / NT / Me / XP / Vista

Technorati Tags: 2000, Camera, compatible, Meeting, night, plus, Skype, vision, Vista, Webcam