TREE

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. A simple emergency lamp which does not require any special equipment; even a multimeter to assemble and use. Any individual who can do a good quality soldering must be able to build this circuit successfully. This can be easily accommodated in the defunct two 6 watt tube National Emergency Lamp or any PL tube type emergency lamp. The difference will be in the working; it will work non stop for more than 8 hours.deep discharge is taken care by the LED characteristic and over charge protection is taken care by the fixed voltage regulator.This uses a simple 3Pin fixed regulator which has a built in current limiting circuit. The only required adjustment is the preset which has to be set to ensure the LEDs just light up (it should be left at that position). The 5mm LDR is just mounted on top of the emergency light a...

This is the simple circuit of automatic emergency light. It is called dark dependent circuit. A 555 timer IC and LDR is used for this configuration. When light fall on the LDR, its resistance is decrease and in dark position its resistance is going high. Using these characteristics of LDR, automatic emergency light is made. Circuit Diagram : Simple Automatic Emergency Light Circuit Diagram LDR is called Light Dependent Resistor. Its resistance is inversely proportional to the falling light on its surface. In dark, its resistance is approximately 7k to 10k. When light fall on its surface, its resistance is decrease to less than 1k. In the circuit, a voltage divider arrangement circuit is used here with LDR and 10K variable resistor. When light fall on the surface of LDR, the resistance decrease to 1k. So the voltage of the timer pin-6 is greater than 2/3 of +Vcc. For this reason the output pin-3 goes low. The base voltage of transistor BC547 is less than 0.75 volt. The transistor ...

 Emergency Lamp With 555 is a single option representing lighting trendy the route of electrical power outages. With Emergency Lamp Sequence 555 uses a 12VDC voltage source with the aim of can stay provided from your 12V battery. Emergency Lamp 555 Sequence With these incredibly very regular and tranquil to make up as every of the components simply to hand from the souk place. Emergency Lamp Sequence With this special 555 can flip to the light 5W-10W.  Emergency Lamp with 555 Timer The circuit is residential with the astable multivibrator simultaneously with the IC 555 with the intention of is certainly employed to mendrive transformer by way of Q1. intended for specially details is often viewed very well within the sequence Emergency Lamp With 555 follows. Functioning frequency range of 555 Emergency Lamp With this specific arrange of configurations R1, R2 and C2. T1 in sequence Emergency Lamp With 10V 500mA 555 is in fact a transformer. Secondary element (0-10V) is conne...

This Simple Emergency Light and Alarm Circuit Diagram is permanently plugged into a mains socket andNI-CD batteries are trickle-charged. When a power outage occurs,the lamp automatically illuminates. Instead of illuminating alamp, an alarm sounder can be chosen.When power supply is restored, the lamp or the alarm isswitched-off. A switch provides a “latch-up” function, in orderto extend lamp or alarm operation even when power is restored.Circuit operation:Mains voltage is reduced to about 12V DC at C2`s terminals, bymeans of the reactance of C1 and the diode bridge (D1-D4). Thusavoids the use of a mains transformer.   Simple Emergency Light and Alarm Circuit Diagram Trickle-charging current for the battery B1 is provided by theseries resistor R3, D5 and the green LED D6 that also monitorsthe presence of mains supply and correct battery charging.Q2 & Q3 form a self-latching pair that start operatingwhen a power outage occurs. In this case, Q1 biasing becomespositive, so this tr...

This is a Simple Emergency Lamp and Turning Indicator Circuit Diagram .White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage. These can be utilised optimally for emergency lamp and vehicle turning indication. The circuits for the purpose are given here. Emergency Lamp and Turning Indicator Circuit Diagram fig 1 Fig. 1 shows the circuit of a white-LED based emergency lamp . You can also use arrays of white LEDs as daytime running lamps in automobiles. In the emergency lamp , seven 1.2V AA-size Ni-Cd cells giving 8.4V have been used as the power source. The brightness is controlled by duty-cycle variation of an astable multivibrator working at 1 kHz. The astable multivibrator is built around IC1. Its output is connected to LED-driver transistor T1. Up to six branches of white LEDs can be connected in parallel, with each branch containing two LEDs in series (only three branches are used here). Depending o...

Circuit Diagram:  Description Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC controlled emergency light. Its main features are: automatic switching-on of the light on mains failure and battery charger with over-charge protection. When mains is absent, relay RL2 is in de-energized state, feeding battery supply to inverter section via its N/C contacts and switch S1. The inverter section comprises IC2 (NE555) which is used in stable mode to produce sharp pulses at the rate of 50 Hz for driving the MOSFETs. The output of IC2 is fed to gate of MOSFET (Q4) directly while it is applied to MOSFET (Q3) gate after inversion by transistor Q2. Thus the power amplifier built around MOSFETs Q3 and Q4 functions in push-pull mode. The output across secondary of transformer T2 can easily drive a 230-volt, 20-watt fluorescent tube. In case light is not required to be on during mains failure...

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. A simple emergency lamp which does not require any special equipment; even a multimeter to assemble and use. Any individual who can do a good quality soldering must be able to build this circuit successfully. This can be easily accommodated in the defunct two 6 watt tube National Emergency Lamp or any PL tube type emergency lamp. The difference will be in the working; it will work non stop for more than 8 hours.deep discharge is taken care by the LED characteristic and over charge protection is taken care by the fixed voltage regulator.This uses a simple 3Pin fixed regulator which has a built in current limiting circuit. Simple Emergency Light Circuit Diagram: The only required adjustment is the preset which has to be set to ensure the LEDs just light up (it should be left at that position). The 5mm LDR is just...

Warning! The circuit is connected to 220Vac mains, then some parts in the circuit board are subjected to lethal potential!. Avoid touching the circuit when plugged and enclose it in a plastic box. Powered by two AA NI-CD batteries Four switchable options Circuit diagram       Parts: R1 220K 1/4W Resistor R2 470R 1/2W Resistor R3 390R 1/4W Resistor R4 1K5 1/4W Resistor R5 1R 1/4W Resistor R6 10K 1/4W Resistor R7 330K 1/4W Resistor R8 470R 1/4W Resistor R9 100R 1/4W Resistor C1 330nF 400V Polyester Capacitor C2 10µF 63V Electrolytic Capacitor C3 100nF 63V Polyester Capacitor C4 10nF 63V Polyester Capacitor D1-D5 1N4007 1000V 1A Diodes D6 LED Green (any shape) D7 1N4148 75V 150mA Diode Q1,Q3,Q4 BC547 45V 100mA NPN Transistors Q2,Q5 BC327 45V 800mA PNP Transistors SW1,SW2 SPST Switches SW3 SPDT Switch LP1 2.2V or 2.5V 250-300mA Torch Lamp SPKR 8 Ohm Loudspeaker B1 2.5V Battery (two AA NI-CD rechargeable cells wired in series) PL1 Male Mains plug Device purpose: This circuit...

This simple emergency lamp circuit uses very components and yet is able to provide some useful service. The shown device is able to switch ON automatically when mains power fails, illuminating all the connected LEDs.As soon as power is restored, the LEDs shut off automatically and the connected starts charging through the built in power supply. The circuit employs a transformerless power supply for initiating the explained automatic actions and also for trickle charging the connected battery. Parts List R1 = 220K, R2 = 10K, D1, D2, D3 = 1N4007, Z1 = 15V 1watt, zener diode, C1 = 105/400V C2 = 100uF/25V T1 = 2N2907, or 8550, or BD 140 Z1 = 12V, 1 watt LEDs = white, high bright type.

This is an LDR based Emergency Lamp that turns on a High watt White LED when there is darkness in the room. It can be used as a simple emergency lamp in the child’s room to avoid the panic situation in the event a sudden power failure.It gives ample light in the room. The circuit is too simple so that it can be enclosed in a small box. A 12 volt miniature battery is used to power the circuit. Two transistors T1 and T2 are used as electronic switches to turn on / off the white LED. When there is sufficient light in the room, LDR conducts so that the base of the PNP transistor T1becomes high and it remains off. T2 also remains off since its base is grounded. In this state, White LED remains off. When the light falling on the LDR decreases, it cease to conduct and T1 forward bias providing base current to T2. It then turns on and White LED switches on. Mini Emergency Light Circuit White LED used in the circuit is 1 watt High bright Luxeon LED . Since 1 watt White LED consumes around 300 m...