Automatic Night Lamp&

Morning Alarm

Automatic Night Lamp & Morning Alarm• Introduction : This circuit automatically turns on a night lamp when room light is switched off. The lamp remains ‘on’ until the light sensor senses daylight in the morning.• LED is used as the night lamp. It gives bright and cool light in the

room.• When the sensor detects the daylight in the morning, amelodious

morning alarm sounds.

• IC NE555N

MUSIC GENERATOR UM66 8 Ω, 4.5W SPEAKER

RESISTORS 220Ω, 560Ω, 580Ω, 1k, 120k, 150k

BC548 TRANSISTOR PN DIODE

LIGHT EMITTING DIODE

ZENER DIODE

LIGHT DEPENDENT RESISTOR

VOLTAGE REGULATOR

Components used:

LDR:• The circuit utilises light-dependant resistors (LDRs) forsensing darkness and light in the room.

• A light dependent resistor or photo resistor is a resistorwhose resistance decreases with increasing incident lightintensity.

555TIMER:• The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired.• 555 timer is used in monostable or astable configuration

MUSIC GENERATOR UM66 :

• General Description:• UM66 is a pleasing music generator IC which works on a supply

voltage of 3V. the required 3V supply is given through a zener regulator. its out put is taken from the pin no1 and is given to a

push pull amplifier to drive the low impedance loud speaker.

• There is setup to generate input DCvoltage to circuit• stepdownTransformer,Bridge rectifier, voltage regulator is used • The output of rectifier is given to the 7806 voltage regulator• zener diode ZD limits the voltage to a safer level of 3.3 volts. • BC548 is used as push pull amplifier

Circuit diagram