Circuit Schematic Chain Link Fence Alarm using 2N7000 MOSFET

Alarm. - Here is Circuit Schematic Chain Link Fence Alarm using 2N7000 MOSFET. I show the use of a cheap 9v battery but a long lasting 12v battery can also be used.  The circuit’s current drain is a very low 2 microamps during normal operation, so any battery will last many years.  The popular 2N7000 MOSFET transistor is good for about 200ma.  I would suggest an n-channel device with a higher current rating, if you plan on using a louder, more powerful siren alarm.  As an example, the IRFZ34 device could drive a 10 amp siren.

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