Schematic for a Small electronic circuit that sounds an alarm when low frequency vibrations are detected in the ground.
So, you have a garden that you want to protect from deer. Or, you want to detect when someone is walking on your property. This electronic circuit is the perfect option.
The circuit uses a standard 2 inch speaker with some slight modifications so that it resonates at a lower frequency. The speaker cone is then used to detect vibrations in the ground. These vibrations are then detected by the electronic circuit, which sounds an alarm.
The circuit uses the CA3094 IC (Integrated Circuit) and a Darlington Pair transistor configuration, which greatly amplifies the small signal produced by the vibrations, thus switching on the alarm circuit.
This document is in PDF format. It contains the circuit diagram, component values, and circuit operation details.
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