2e

TROUBLESHOOTING

□    Tug slightly on all parts to make surę that they are indeed soldered.

□    A solder bridge may occur If you accidently touch an adjacent foil by using too much solder or by dragging the soldering iron across adjacent foils. Break the bridge with your iron.

□    Make surę that all of the parts are placed in their correct position. Check if the transistors’ orientations are correct.

□    Make surę that the polarity of the LED and microphone are placed in the correct position.

FOIL SIDE OF PC BOARD

SCHEMATIC DIAGRAM

3.00V

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