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ELECTRONICS![]()
Digital Camera
The basic principle of how a camera works has not changed much since its invention. In the simplest terms, they allow light to pass through an opening, focusing it, and preserving an image. The primary differences today come from the electronic mechanics of handling the optical aspects, such as the lenses, and the new way of translating the image to a digital medium rather than imprinting it on film.
This point-and-shoot digital camera shows the lens pathway to the sensor inside that captures the image. The light from an image is focused through the lenses and projected onto a sensor at the back of the camera. This sensor converts the light into pixels, saves the data to the storage card, and displays it on a screen on the back of the camera.
Looking inside, it’s fun to see how compact these devices really are, packing the sensor, digital processor, and display screen in such a tight package.
In this image you can also see some rusting on the interior, which can be a side effect of the waterjet making contact with steel parts, causing oxidation.
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DSLR Camera
DSLR (digital single-lens reflex) cameras are just an updated version of the first cameras, which used a cover over an exposure plate to capture an image. Instead of an exposure plate, the DSLR uses a large digital sensor to capture the light information of the image, and produces a picture saved to a memory card. The sensor is completely covered by a small mirror that reflects the light from the lens upward, toward a prism that shapes the image into the eyepiece. When the shutter is pressed, the mirror moves out of the way, exposes the sensor to the light from the lens, and captures the picture. All this happens in a split second, but you can hear the action every time the shutter is pressed.
The large lens assembly focuses light into the camera. The lenses can be adjusted to magnify the image and shift the focal point, operated by the zoom and focus rings on the camera lens.
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LED Light Bulb
Even the ubiquitous light bulb reveals secrets when we look inside. Unlike traditional incandescent light bulbs that heat a thin magnesium filament inside a vacuum to generate light, this modern bulb uses light emitting diodes (LEDs).
This LED bulb has a ring of lights covered by a plastic dome that diffuses the light to an even glow. The power to the LEDs is controlled by a circuit board and electrical components hidden inside the body of the bulb. Not only are these types of bulbs more energy efficient, but they also outlast incandescent bulbs as there are fewer parts that wear out (for instance, no thin filament as in an incandescent bulb). As an added layer of durability, the empty space inside the bulb body is filled with a resin, which solidifies and protects the components from movement. This, combined with the plastic dome cover, means that this bulb could be dropped without causing any damage. How neat is that?
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Electric Massager
These massagers use an electric motor with an off-center weight on the motor shaft to create an eccentric movement inside the device. This movement translates to a vibrating motion that can be applied to your muscles to relieve tension.
The battery compartment on the top has foam padding to help keep the batteries in place and prevent them from rattling around when vibrating. The top half is separated from the bottom with a silicone gasket, to isolate the vibrations to the lower half from the hand grip up top, insulating your hands from vibration fatigue.
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Audio Cassette Recorder
Once upon a time (in the 1960s), cassette tapes were an exciting innovation in portable recorded sound technology. Cassettes consist of a ribbon of tape running between two reels and encoded with magnetized information, allowing audio to be recorded and played back. While vinyl records were made in a factory and could only be played, cassette tapes were sold either containing pre-recorded content or as a recordable blank cassette, allowing audio to be recorded at home, a revolutionary (and contentious) development at the time.
Once a cassette tape is loaded into the machine, a magnetic device called the head is pushed against the tape ribbon. Much like a record stylus reads grooves on a record to create sound, the sensitive cassette head reads the tape for variations of the magnetic pattern, translating the information on tape into sound. A motor t...
