This is a simple fire detector alarm circuit using BC547 transistor. This fire alarm circuit can easily detect the fire with IR LED and start the buzzer.
This is an automatic street light using LDR and BC547. This automatic street light control system explained with complete circuit diagram & the use of LDR.
This is a simple 12v LED dimmable lights circuit using the 555 timer ic. We can control the brightness of this PWM dimmable LED light with a potentiometer.