Electronic Circuits and Tutorials
Electronic Schematics - E

Emergency Light Circuits

Emergency Light & Alarm - Powered by2-AA NI-CD batteries Four switch able options

Emergency Light - A simple circuit that activates a light when the power is out. A version with a light bulb and another with white LED light included.

Failed Power Light - turns on small low voltage lighting when mains power disappears

Automatic LED Emergency Light - This is one of the most cost effective (cheap) and simple emergency light circuit developed for CircuitsToday – This is an automatic emergency lamp with day light sensing, means it senses darkness/night and turns ON automatically. Similarly it senses day light and turns OFF automatically.

Main Fuse-Panel Emergency Light - The area around the Main Electrical Panel is usual pretty dark, especially if it is located in the basement.  That's during daylight hours.  At night everything is dark during a power failure, or tripped circuit breaker, fuse, etc. This circuit provides ample time to fix the problem.....(Tony van Roon's diagram)

Emergency Light & Alarm - This circuit is permanently plugged into a mains socket and NI-CD batteries are trickle-charged. When a power outage occurs, the lamp automatically illuminates. Instead of illuminating a lamp, an alarm sounder can be chosen. When power supply is restored, the lamp or the alarm is switched-off. A switch provides a "latch-up" function, in order to extend lamp or alarm operation even when power is restored.

Emergency light - This circuit is capable of making the 20watt florescent tube light to work for four hours continuously. The circuit is divided in to two parts the first part is the charging unit which charges the lead acid battery. The output of the step down transformer x1 is converted in to DC by four diodes connected in bridge. This DC voltage is used to charge the battery the DC voltage also operates the relay.

LM317 Automatic Low Cost Emergency Light - The circuit consists of two parts: the charger from the socket and the power LED part driver. The Charger is built around the 3-terminal adjustable regulator (IC1) LM317, while the LED driver is built on part of the transistor BD140 (T2).

Fully Automatic Emergency Light - The circuit can be divided into inverter and charger sections. The inverter section is built around timer NE555, while the charger section is built around 3-terminal adjustable regulator LM317. In the inverter section, NE555 is wired as an astable multivibrator that produces a 15kHz squarewave. Output pin 3 of IC 555 is connected to the Darlington pair formed by transistors SL100 (T1) and 2N3055 (T2) via resistor R4.

Automatic LED Emergency Light-Modified Version

Emergency Lamp Battery Protector - Emergency lamps do not have a facility to prevent the deep discharge of battery if the lamp remains on during day time. The fluorescent lamp filament also damages if it is glowing in low battery voltage. This causes blackening of the filament side that indicates the damaged filament.

Make this Useful Emergency Light using 'Cool' White LEDs - We are all aware of the ill effects of global warming gripping the world strongly with each passing day. Although the major cause of this phenomenon is almost certainly the use of fossil fuels as the main source of energy by many countries, the contribution of lighting in different forms to the problem in cannot be entirely ignored. Common, but age-old incandescent bulbs have become almost obsolete, but even modern CFLs emit quite a bit of heat. White LED lamps today are becoming a popular (and smart) alternative due to their rather "cool" nature and high efficiency.

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