AVT AVT1460 Manuale

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Twilight switch automatically switches on and

off the lighting of your home, garden or other

place. When it gets dark, the device switches on

the output relay. The twilight switch is equipped

with circuitry that eliminates the possibility of

oscillation if the illumination level is at the

operating threshold.

Functional description

Schematic of the twilight switch is shown in

Figure 1. It is based on the TL071 operating

amplifier working as a comparator. The TL071

compares the voltage from the potentiometer

PR1 to the voltage from a resistive divider made

up of a resistor R3 and a photoresistor. The

decrease in the intensity of light incident on the

photoresistor causes an increase in the voltage

on the pin 2 of the operational amplifier U1. If

the voltage on the pin 2 will be higher than the

voltage on the pin 3, the amplifier output

voltage appears, causing conduction of the

transistor T1 and switching on the relay RL1.

AVT 1460

Twilight switch

Specifications

• photo resistor as a light sensor

• adjustable sensitivity

• hysteresis eliminates oscillations when the

lighting is at the operating threshold

• active status indication with LED

• output relay with contacts 230V AC, 8A

• power supply: 12-15V DC

The PR1 potentiometer allows for adjusting the

sensitivity threshold over a wide range. The C3

capacitor eliminates the possibility of oscillation

if the illumination level is at the operating

threshold. Relay contacts are switched on at

dusk and off at dawn. Using the changeover

contacts can reverse the operation of the

device. The high load capacity of the relay

contacts enables the switch to be used in a

variety of applications. The switch can be

battery.

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