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introduction Magnification adjustment: R7, R5 is the magnification set resistance (delivery default is about 5 times to enlarge, you can change the magnification according to their needs, the resistance can be selected from 5k-47k, the greater the resistance, the higher the magnification, if it is a plug resistor , You can remove the original chip resistors, the plug-in resistance welding in the patch position on both sides of the pad)
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