Water Level Controller Circuit using Transistor and Relay

Water Level Controller Circuit using Transistor and Relay

Water Level Controller Circuit

This simple Water level controller circuit is useful to control the water level in a tank. It does this by turning On and Off a water pump depending on the status of the sensors.

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Light detector circuit using transistors and relay

Light detector circuit using transistors and relay

This light detector circuit activates a lighting device through a relay when the intensity of the daylight is no longer sufficient.

It can be used to illuminate the main entrance of the house, a showcase that must be kept lit at night, an unsafe area at night, etc.

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ON-OFF Switch circuit using a 555 timer (PCB)

ON-OFF Switch circuit using a 555 timer (PCB)

This ON-OFF Switch circuit using a 555 timer is simple, useful and easy to implement.

This circuit has many applications on places where it is necessary to activate and deactivate (connect and disconnect) an electrical or electronic device.

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Twilight switch circuit with operational amplifier and LDR

Twilight switch circuit with operational amplifier and LDR

This Twilight switch circuit activates a light, a lamp, a motor, etc., at the time of sunset and performs the reverse process at dawn.

This is an ideal circuit for activating a security light that must be on all night.

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Dark detector circuit using LDR and relay

Dark detector circuit using LDR and relay

Dark detector circuit using LDR and relay

This circuit uses, as a main component, an LDR (photoresistor). An LDR changes its resistance value depending on the amount of light it received.

The more light means less resistance, the less light means more resistance.

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