In tall buildings, towers or high structures it is important to show warning light for aircraft safety. Normally a red 230V LED bulb is used as warning lamp. This LDR Based Aircraft Warning Signal Light Circuit automatically switches ON the bulb in night and switch OFF in day. It uses LDR sensor, relay and small […]
LDR Circuits
Automatic Light Control Switch Circuit using IC 555
This article is for Automatic Light Control Switch Circuit using IC 555 It works with light dependent resistor (LDR). When light fall on LDR its resistance changes. That resistance change is converted by IC 555 and used to drive a relay. With relay we can connect lamp, fan, motor or other load. It is useful […]
12V Mini Emergency Light Circuit with LDR
12V Mini Emergency Light Circuit with LDR is simple project to make. Light is ON automatically when dark. It works with bright white LED and uses 12V battery. Circuit is good for home, garage and emergency. Circuit Working: Parts List: Component Type Value Quantity Resistors 10k 1/4 watt 1 2.2k 1/4 watt 1 33Ω 3 […]
Light Controlled Switch Circuit using IC LM311 and LDR
This article talks about Light Controlled Switch Circuit using IC LM311 and LDR. It simple and very useful and it feel light change near it. We find this circuit in many place like automatic light, street lamp and security system. Main thing is voltage comparator with LM311 IC. LDR sees light and LM311 IC turns […]
Automatic Night Lamp Circuit with Photocell
Automatic night lamp use photocell to check light or dark..When dark the lamp is ON. When light the lamp goes OFF. It is good for street, garden and security lights. Parts used in circuits are LDR (ORP12), op-amp (uA741), relay which controls the AC lamp. Low light makes relay ON and lamp ON. This Automatic […]
Building an LDR Comparator Circuit using IC LM339
Building an LDR Comparator Circuit using IC LM339 is useful and important in many electronic jobs like sensing and control. Using LDR, resistors, LED and LM339 IC we can make a simple circuit to check light level and show light change. LDR works like light sensor and its resistance changes when light changes. Using preset […]