Electronic Rodent Trap

Overview

An electronic rodent trap is a battery-powered device that delivers a controlled electric shock to kill rodents (mice and rats) instantly. Unlike snap traps or spring mechanisms, which rely on kinetic energy, electronic traps use a high-voltage pulse generated from low battery voltage through a step-up converter. The rodent enters a dark tunnel to reach bait and completes a circuit by touching both electrodes, triggering a capacitor discharge that stops the heart.

The trap consists of a plastic housing with a narrow tunnel passage, a pair of closely spaced contact electrodes, a low-voltage high-voltage converter, a sensing circuit, a battery pack, and an automatic reset mechanism. A status LED indicates armed/fired state. The design is safe for humans (high voltage but very low total energy) and requires no moving parts or complicated setup.

How it works

Four to eight AA or C cells in the Battery Pack provide 4.5–9 V DC to the High-Voltage Generator, which boosts this to 3000–6000 V across the Contact Plates. The boost is achieved with a Flyback Transformer driven at 50–100 kHz by a Boost Switching Transistor. A Storage Capacitor accumulates the stepped-up voltage; a High-Voltage Rectifier converts the high-voltage AC output to DC charging the capacitor.

When the trap is armed, the Sensing Circuit is active and waiting. A rodent, attracted by bait in the Bait Chamber, enters through the tunnel and touches both the Positive Electrode and Negative Electrode simultaneously. The current flow is immediately detected by the Sense Comparator on the sensing board, which triggers the Trigger Relay to discharge the capacitor through the rodent's body.

The discharge is brief (0.1–0.5 seconds) but carries enough current (20–100 mA) to stop the heart. Once the pulse completes, the Sensing Circuit signals the Logic Timer to disable the trigger for 10–30 seconds, allowing the capacitor to recharge while preventing accidental re-discharge. The Reset Mechanism mechanically or electromagnetically re-arms the trap for the next cycle.

A Status LED illuminates to show trap status: green when armed and ready, red or off after a discharge. The operator checks the Inspection Door to inspect the trap and remove the dead rodent.

Advantages and limitations

Electronic traps kill instantly and humanely, leaving the body intact for disposal. They require no moving parts subject to mechanical wear and function reliably in most conditions. The main limitation is battery life: a set of eight AA cells typically lasts for 50–150 kills before voltage sag causes failure to generate sufficient killing voltage.

Electronic traps are most effective in tight, dark spaces (basements, walls, enclosed storage) where rodents naturally travel and bait remains protected from weather. They are less reliable in bright areas or outdoors, where rodents are less likely to enter the tunnel or rain can compromise the electrical contacts.