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Depending on how much power is consumed by the HDD, a single USB connection will usually suffice. In some heavy current situations, you may need a "double headed" cable which has two USB Type A plugs to draw the extra current from the Host Computer.
If you look closely at all the photos, it isn't very hard to figure out that this is genuine and there is enough information to reveal exactly how it was done. It certainly requires a great deal of patience to do it.When it comes to seeing "street" magicians doing this, I want a cell phone in a bottle. That's one I can't figure out.The tennis balls in the carafe is easily explained. I would place one tennis ball in the neck and put it all in a hyperbaric chamber. As the air pressure increases, the tennis ball will get smaller until it falls through the neck. Then repeat the process for the second ball. There may have been some sort of weight sitting on top of each ball to speed up the process.
If you've played with this before, is the UV light really necessary? The only UV source I have is the sun, and I think a higher concentration of H202 would serve me better (and be far more accessible)OR:Are you relying on the UV light to turn the escaping Oxygen into Ozone?
Using AC with LEDs (Part 1)
It's a 12V LED strip. The LEDs are arranged in groups along the strip with a dropper resistor for each group. That is why you must find the "right" place to cut it.
LED TUBE LIGHT (AC)
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One just uses the eight data pins to step the motors. By using 4 pairs, any stepper can be triggered forward or back.By using 7 unique and one for direction, you can step up to 7 motors in either direction.Of course, timing is an issue and navigating angles is greatly affected by said timing!
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