DIY Rotierendes Digitales Led-Anzeigemodul Alarm Elektronisches Digitaluhr-Kit

The welding sequence is wrong. The chip notch and the base notch must be consistent with the notch identified on the board. Check for solder shorts and solder joints. Battery, then plug in the DS1302, do not plug in the battery, and then power on, Put the battery on after normal.

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