Clap Operated Staircase Light, Certification : CE Certified

The Clap Operated Staircase Light is a useful device for staircase light, which can be turned ‘ON’ by clap & ‘Off’ as per delay setting. The Clap Operated Staircase Light is a solution for common habit of switching the light on and forgetting the same. Stairways, corridors or small indoor passages often tend to be dark throughout the day irrespective of the outdoor ambient light conditions. Therefore keeping such passages illuminated all the time becomes imperative, however this leads to unnecessary wastage of electricity.
This 9-12V battery-operated circuit triggers an Lights on when a sound is detected. It can also be used staircase light delay ON time setup as per your choice, which is as per person taking time to up or down period to complete staircase distance. The circuit has an ordinary condenser microphone MIC1 as a sound sensor. Sensitivity of this microphone can be changed to some extent by changing the value of the bias resistor R1. When the circuit is powered by a 9-12V battery supply to the circuit, transistor T1 acts as pre amplifier and T2 is again amplification the week signal of the mic and condenser C3 charge /discharge pulse fed to the IC1 of pin 2. This IC1 is in monostable mode the time starts up to the capacitor C5 will be discharge, and output pin 3 of IC 1 get firing the transistor T3 conduct, hence relay will be 'ON' and start the light / Bulb through relay in the series of the mains 220v will be 'ON'. The time period can be adjust by setting to VR2 Preset. VR1& R9 use for pull-up resistance for adjusting the avoid chattering the pin 2 of IC1.