Build a 6V Nocturnal Animal Repeller Circuit

A low-rate flashing light deters unwanted wildlife

Automatic activation and deactivation

Circuit diagram

Components:

Device Purpose:

This circuit has proven exceptionally helpful in discouraging bats and other nocturnal animals from appearing on a terrace or veranda. It can be utilized for similar or diverse applications. The light activates after a 4-5 second delay and remains inactive for approximately one minute and fifteen seconds. The photoresistor enables automatic activation of the circuit at dusk and deactivation at dawn. Assuming an eight-hour operational period nightly, the light remains illuminated for roughly 30 minutes, contributing significantly to energy conservation.

Circuit Operation:

IC1 is configured as an astable multivibrator, achieving on and off time delays as previously explained. R1 and C1 determine the on time-delay, while R2 and C1 establish the off time-delay. Given the absence of critical parameters, these delays can be adjusted to your preferences. Q1 serves as the lamp driver and is capable of powering substantial lamps. C2 mitigates brief instability that may occur when the voltage at pin 4 of IC1 approaches the switching threshold.

Remarks: