To drive these rats disorders, you can create an electronic circuit as shown below. This circuit will generate a 50Khz frequency disturbing enough for a mouse but you do not have worried because you will not hear it. This series is guaranteed by the rats would run because his ears will feel pain from the vibration signal ferkuensi.
Heart of electronic rat repellent circuit IC 555 is already very popular, cheap and versatile. For maximum results use the loudspeaker from the PIEZO tweeter speakers electric or funnel shape. Electronic rat repellent is effective for rooms up to 200 m 2 area from the right placement. This circuit is placed in the corner of the room so that his frequency noise can be spread across the room without a hitch. Turn on continuously to keep the rats do not come back, do not worry about the electricity consumption for electrical power needed is low enough, is still greater watt/220 light bulb 5 volts.