Sound operated Timer
Call for Price
Sound operated Timer
Description
Sound operated Timer
Introduction
This circuit is based upon NE555 timer and LM324 Quad operational amplifier. This circuit is used in sound based burglar alarm.
Working
- Output pin 1 of LM324 (IC1) is fed to pin 2 of NE555 (IC2) through capacitor C3. IC2 is configured as a monostable multivibrator. Sound signal, sensed by condenser microphone MIC1 is amplified by IC1.
- Amplified signal is fed to trigger pin 2 of IC2. Output pin 3 of IC2 goes high and relay RL1 gets energised.
- Energisation of the relay is indicated by the glowing of LED1. NE555 can source 200mA current; so, an ordinary relay can be directly connected to IC2’s output without an extra transistor driver. Use a good-quality microphone for maximum sensitivity.
Application
- Security systems
- Sound based Burgler alarm
Additional information
Weight | 1.000000 kg |
---|
Reviews
There are no reviews yet.