Caution in order to work.1. ventilation, ventilation must be such that no solid copper stripes that may be incomplete.2. After you are finished, check the abrasives and copper stripes again. Be careful not to have copper lines that are not needed. Otherwise, the circuit may be damaged.3. drill hole size must be selected according to the size of the output device.4. a device with multiple pole or tripod must be careful not to crash, or a device or circuit may be damaged.5. prior to the test cycle, the teacher should make sure again and should be performed with caution.6. this cycle can't Dim fluorescent.
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