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A device, components, or safety measure designed to protect circuits from overvoltage, overcurrent, a combination of these; or the theory of same.

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D28 and D27 are clamping diodes; whenever either of the data lines sinks below ground, the diode will source current into it to clamp it back to ground. The polarity of the diodes here is correct. Not …
answered Feb 8 by Andrey Akhmetov