Schematic Diagram: lamp

Showing posts with label lamp. Show all posts

Friday, September 26, 2014

Simple Emergency Lamp Circuit Diagram

The circuit within the dotted line for a mini emergency light can be incorporated into any battery eliminator, provided the eliminator’s voltage is higher than the battery’s voltage.
For greater load (1.e. for more light through a b1gger lamp), Tl should be a power transistor such as ADl49. Diode in the circuit prevents the flow of current from battery in the emergency light to the radio during power failure. It is enough to use the switch in the radio set to tum it off.
However, when the power is off, the transistor gets forward biased and the lamp lights up.
Whenever there is power, the transistor is kept reverse biased and there is no current flowing through the collector circuit.

The following circuit of a simple LED flasher can be used for any indication purpose in stereo amplifiers, tape recorders, fancy dolls etc. All components are locally available and the project would cost about Rs 12 only, apart from power supply. A Schmitt trigger provides regenerative switching, and Rl gives the necessary charge/ discharge bistable action as Tl is switched on and off. R3 and R4 set the “on’ and ‘off times respectively. Brightness of the LED is set by Rl and Vg Depending upon the capacitor, the R-C time constant can be adjusted.

Simple 7-Segment Counter Circuit

lC3 is similarly fed from IC2. The contents of each decade counter are taken in BCD (binary coded decimal) form, fed through IC 7447 BCD to 7- segment decoder driver and displayed on the corresponding FND 507 LED display.
These shaped pulses_are counted by three decade chain counters using three 7490 ICs. Input is given to pin I4 of ICI and output from pin ll of this IC is fed to pin I4 of IC2.
Thus the contents of ICI, IC2 and lC3 are displayed one Ll (hundreds), L2 (tens) and L3 (units) I respectively. Capacitors Cl-C6 are used for noise rejection. A series of three diodes, all lN400l type, have been used for current limiting of the displays and also for maintaining the flow of current in a unidirectional way.
Sl resets the counter. Circuit diagram of regulated +5V supply is shown in Fig. 2. Mains voltage is stepped down to 9V AC by transformer xi, rectified by a rectifier bridge comprising four diodes (D4-D7) and regulated to +5V by ICS (7805)

Wednesday, September 24, 2014

Simple AC Mains Lamp Flasher Circuit

Flashers are useful as visual metronomes, and for decoration and advertising purposes, here we learn how to build one at home. Conventional. thermal flashers make use of a bimetallic strip which alternately heats and cools, thereby breaking and making an electrical contact. Such flashers are uureliabledue to various mechanical problems. glimther, due to sparking at the contacts, their life is limited, and also their flashing rate is not constant. The solidstate electronic flasher described here suffers frdm none of the above disadvantages. A 555 timer IC operated as an astable multivibrator is used to control the on and off times of triac, which in tum controls power to the lamps. The flashing rate is determined by settings on the potentiometer, and is approximately given by

f = 43/(VR1+R2)C flashes/minute

Hence by varying the resistance included through 250K potentiometer (VR1), it is possible to adjust the flashing rate from about 6 flashes/ minute (slow) to about 60 flashes/ · minute (fast). The on and off times are almost equal due to symmetry of the astable circuit. The ST44A triac used here has a 400 PlV, 4-amp rating; With it the load must be restricted to a maximum of 500W. The triac should be clipped to at suitable electrically isolated heatsink. The unit should be assemble inside a plastic or wooden box, and on switching it on, no part of the circuitry, except the rate adjust potentiometer (which must preferably have a plastic knob) should be touched as all parts will be alive. An approximate cost of the electronic ponents used is Rs 100/-

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Sunday, September 14, 2014

Bedside Lamp Timer

The purpose of this schema is to power a lamp or other appliance for a given time (30 minutes in this case), and then to turn it off. It is useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep... After turn-on by P1 pushbutton, the LED illuminates for around 25 minutes, but then it starts to blink for two minutes, stops blinking for two minutes and blinks for another two just before switching the lamp off, thus signaling that the on-time is ending. If the user want to prolong the reading, he/she can earn another half-hour of light by pushing on P1. Turning-off the lamp at users ease is obtained by pushing on P2

Lamp-shade

Parts:

R1________1K 1/4W Resistor R2________4K7 1/4W Resistor R3_______10M 1/4W Resistor R4________1M 1/4W Resistor R5_______10K 1/4W Resistor C1_______470µF 25V Electrolytic Capacitor C2-C4____100nF 63V Polyester Capacitors D1-D4____1N4002 100V 1A Diodes D5_______5mm. Red LED IC1______4012 Dual 4 input NAND gate IC IC2______4060 14 stage ripple counter and oscillator IC Q1_______BC328 25V 800mA PNP Transistor Q2_______BC547 45V 100mA NPN Transistor P1,P2____SPST Pushbuttons T1_______220V Primary, 9 + 9V Secondary 1VA Mains transformer RL1______10.5V 470 Ohm Relay with SPDT 2A 220V switch PL1______Male Mains plug SK1______Female Mains socket Q1 and Q2 form an ALL-ON ALL-OFF schema that in the off state draws no significant current. P1 starts the schema, the relay is turned on and the two ICs are powered. The lamp is powered by the relay switch, and IC2 is reset with a positive voltage at pin 12. IC2 starts oscillating at a frequency set by R4 and C4. With the values shown, pin 3 goes high after around 30 minutes, turning off the schema via C3. During the c6 minutes preceding turn-off, the LED does a blinking action by connections of IC1 to pins 1, 2 & 15 of IC2. Blinking frequency is provided by IC2 oscillator at pin 9. The two gates of IC1 are wired in parallel to source more current. If required, a piezo sounder can be connected to pins 1 & 14 of IC1. Obviously, timings can be varied changing C4 and/or R4 values.

Wednesday, September 10, 2014

RGB Solar Lamp Wiring diagram Schematic

This deluxe solar-powered light uses a battery and solar cells salvaged from a solar lamp with a four-cell battery (4.8 V nominal terminal voltage).

Circuit diagram :

RGB Solar Lamp Circuit Diagram

The schema can operate from any DC voltage around this value and its current consumption, at 20 mA, is low. This means that the battery can give up to ﬁve days of operation. The schema consists of an Atmel ATtiny microcontroller which drives a red, a green and a blue LED directly from three port pins. Series resistors are of course included to limit the LED current. The microcontroller drives the LEDs in sequence to produce an RGB running light effect. The microcontroller is also responsible for ensuring that the light automatically switches on when it gets dark and off when it is light. The light sensor is made from one of the solar cells from a bro-ken solar lamp (it is more common for the battery to fail rather than the solar cells).

The power output of this cell is not important, as the microcontroller only measures its output voltage using its internal A/D converter connected to pin PB4. The project is ideal for beginners, as a ready-programmed microcontroller is avail-able from the Elektor Shop (order code 100581-41).

Source by : Streampowers

Thursday, August 28, 2014

Simple Cold Cathode Fluorescent Lamp Supply Wiring diagram Schematic

Simple Cold-Cathode Fluorescent-Lamp Supply Circuit Diagram. For back-lit LCD displays, this supply will drive a lamp. LT1072 drives Ql and Q2, and a sine wave appears across CI. LI is a transformer that steps up this voltage to about 1400 V. Dl and D2 detect lamp current and form a feedback loop to the LT1072 to control lamp brightness. C1 = MUST BE A LOW LOSS CAPACITOR. METALIZED POLYCARB WIMA FPK 2 (GERMAN) RECOMMENDED. L1 = SUMIDA 6345-020 OR COILTRONIX CTX110092-1. PIN NUMBERS SHOWN FOR COILTRONIX UNIT. L2 = COILTRONIX CTX300-4 * = 1 % FILM RESISTOR.

Cold-Cathode Fluorescent-Lamp Supply Circuit Diagram

Saturday, August 23, 2014

Fog Lamp Sensor Wiring diagram Schematic

For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions.

Circuit diagram :

Fog Lamp Sensor Circuit Diagram

When this fog lamp is switched on, the fog lamp of the pulling vehicle must be switched off to avoid irritating reflections. For this purpose, a mechanical switch is now built into the 13-way female connector in order to switch off the fog lamp of the pulling vehicle and switch on the fog lamp of the trailer or caravan. For anyone who uses a 7-way connector, this switching can also be implemented electronically with the aid of the schema illustrated here.

Here a type P521 optocoupler detects whether the fog lamp of the caravan or trailer is connected. If the fog lamp is switched on in the car, a current flows through the caravan fog lamp via diodes D1 and D2. This causes the LED in the optocoupler to light up, with the result that the phototransistor conducts and energises the relay via transistor T1. The relay switches off the fog lamp of the car.

For anyone who’s not all thumbs, this small schema can easily be built on a small piece of perforated schema board and then fitted somewhere close to the rear lamp fitting of the pulling vehicle.

Sunday, August 10, 2014

4W Fluorescent lamp driver

This is a 4W fluorescent lamp driver.we can operate this with 12 v battery.so I suppose you can attach this one for your vehicle even. on the other hand you can use this one as an emergency lamp.so try on this be creative to get the maximum harvest.

Notes.

* Assemble the schema on a general purpose PCB.
* The IC 1 must be mounted on a holder.
* Use heat sink for transistor Q1.
* Use a 3 V primary , 230 V secondary, 5W transformer for T1.
* Power the schema from a 12V battery or 12V DC power supply.
* The L1 can be a 6 inch, 4W fluorescent lamp.