正翻译步骤 55
步骤 55
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Chips on the back of the board:
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STMicroelectronics 324 E9SU518 - Possibly an LM324 Quad Op Amp?
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STMicroelectronics 339 E9W2513 - Possibly an LM339 Quad Comparator?
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Unidentified Texas Instruments chip with the part number sanded off.
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Large QFP chip with the part number sanded off and a red and a blue mark on top.
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Interestingly, all the chips were covered in a clear coating that made it hard to read the part numbers.
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It appears that whoever designed this board was trying to prevent reverse engineering by making it hard to read the part numbers on the chips.
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