Lighting

Lighting auto controller

Lighting auto controller

The governor following is intended to regulate the light intensity incandescent 220 V. The components in a relatively few, which means it can easily be mounted onto a small plate. After the build, we recommend you place it inside the box which is flush mounted switch ON / OFF the lamp. Setting the switch to ON, the lamp will light after about 400 msec, a delay is probably negligible. But when the state enters the ON OFF, then mesolathei a period of 20 sec, the brightness of the lamp remains unchanged to start falling out soon after. ..

Light Alarm

Light Alarm

This is a simple Photo-sensing circuit. When light hits the photo-transistor, triggers the 4011 that drives a loudspeaker. Easy to make and can be very usefull too...

advanced bicycle lighting Schematic

advanced bicycle lighting Schematic

That Circuit is an advanced bicycle lighting system which will power your lights and also charge four NiCd batteries while you running in the streets, for keeping the lights on while the bicycle is stoped. Its fully automated without any switches. ..

12V smooth Flashing circuit

12V smooth Flashing circuit

This circuit ensures that a blinking slowly, ie the lamp is brighter lights until a maximum is reached and then gradually decrease in strength until the lamp is off. IC1a opamp is used here to a triangular voltage generation. The opamp acts as a comparator, ie the output is at full power. If the positive input is higher than the minus input, the output of the opamp high and low otherwise. The resistor divider R1/R2 ensures that half the supply voltage to the positive input of the opamp state, but R3 is in parallel with R1 when the output is high, and parallel to R2 if the output is low. This input toggles between still 1 / 3 and 2 / 3 of the supply voltage. ..

Electric candle simulation schematic

Electric candle simulation schematic

For a candle to burn, we need a heat source (the flame of a match) and to extinguish it, you do it just to blow out. The following circuit behaves similarly. If you use your fingers heats the thermistor, its resistance decreases. The tension on the thermistor is lower and there is more current to the base of the left transistor. From here, more power to the base of the right transistor, which will guide and the light comes on. If the light and the thermistor close to each other, the heat of the thermistor heat lamp and the lamp will remain lit. ..

Flashing Mains Lamps circuit

Flashing Mains Lamps circuit

This is a design for a flashlight that two 220 V alternating lights can control. The flashlight uses only one IC. IC1a IC1c to be used for the flashing signal generation. The output of IC1c thyristor T1 is controlled, it lights up then release L1. IC1c After the signal is again inverted so as L1 L2 lights not lit. ..

4 channels Lamp organ

4 channels Lamp organ

This light organ is on the speaker output of the amplifier. The lamps lit on the rhythm of the music. The input signal is amplified by a transformer. Then it goes through a monolingual filters comprising resistors and capacitors to the pots and then to the triacs. By the filters respond to each triac a separate frequency, T1 is the bass and T4 for the high. P2 to P5, the sensitivity for each set triac. P1 controls the sensitivity of the whole circuit. ..

20 minute lamp fader

20 minute lamp fader

In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit power. The bridge rectifier should be rated at 200 volts and 5 amps or more. In operation, a 700 Hz triangle waveform is generated at pin 1 of the LM324 and a slow rising voltage is obtained at pin 8. These two signals are compared at pins 12 and 13 to produce a varying duty cycle rectangular waveform at pin 14, which controls the MOSFET and brightness of the 60 watt lamp. ..

Lamp Fader schematic

Lamp Fader schematic

The sunset lamp comes on at full brightness and then slowly fades out over 1.5 hours time and stays off until power is recycled...

Light Sequencer schematic

Light Sequencer schematic

The drawing below illustrates a multistage light sequencer using descrete parts and no integrated circuits. The idea is not new and I hear a similar circuit was developed about 40 years ago using germanium transistors. The idea is to connect the lights so that as one turns off it causes the next to turn on, and so forth. This is accomplished with a large capacitor between each stage that charges when a stage turns off and supplies base current to the next transistor, thus turning it on. Any number of stages can be used and the drawing below illustrates 3 small Christmas lights running at about 5 volts and 200mA. ..

5 Volt to 12 Volt bi-directional lamp sequencer

5 Volt to 12 Volt bi-directional lamp sequencer

The circuit below is designed to be used with the bi-directional lamp sequencer shown above on this same page. Two additional transistors are used to increase the current from the 74HCT138 decoder to control 12 volt 25 watt lamps. A 6.8 volt/1 watt zener diode is used in series with the ground connection of all the CMOS ICs (74HC14, CD4516 and 74HC138s) so that the total voltage across the CMOS devices will be about 5.2 volts and the outputs will move from +12 to about +7 when selected. ..

12 Neon Lamps Sequencer circuit

12 Neon Lamps Sequencer circuit

This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs. It operates from 2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High voltage (70 volts) for the neon lamps is obtained from a small switching power supply using a 74HC14 Schmitt trigger squarewave oscillator, high voltage switching transistor, and 10 mH high Q inductor. Most any small PNP transistors can be used that have a C/E voltage rating of 80 or more. The inverter stage (pins 5,6) is not needed and is just an extra stage. ..

Neon Lamp Flashing Schematic

Neon Lamp Flashing Schematic

In this circuit, one, two or three neon indicator bulbs can be made to flash in sequence at rates determined by the R and C values. In the single stage circuit, using one lamp, the capacitor charges through the resistor until the ionization potential of the neon is reached (about 70 volts) and then discharges quickly through the lamp until the voltage falls below what is needed to sustain the lamp which is approximately 45 volts. The cycle then repeats at a rate of about 3 Hz for values shown...

Racing Finish Line Lamps circuit

Racing Finish Line Lamps circuit

The finish line circuit below detects the first of three cars to cross the line and illuminates a 25 watt 120 VAC lamp indicating the winning lane. Three photo transistors are used which can be embedded into the track with a light shining down onto the finish line so that as the car crosses over the sensor, the light is blocked, activating the relay and lighting the lamp for the appropriate track. The light source should be an incandescent type, florescent lights may not work due to low infra-red content. The circuit was tested using a 100 watt incandescent light fixture about 3 feet above the photo transistors...

AC Lamp Chaser schematic

AC Lamp Chaser schematic

This circuit is basically the same as the 10 channel LED sequencer with the addition of solid state relays to control the AC lamps. The relay shown in the diagram is a Radio Shack 3 amp unit (part no. 275-310) that requires 1.2 volts DC to activate. No current spec was given but I assume it needs just a few milliamps to light the internal LED. A 360 ohm resistor is shown which would limit the current to 17 mA using a 9 volt supply. I tested the circuit using a solid state relay (of unknown type) which required only 1.5 mA at 3 volts but operates up to 30 volts DC and a much higher current. ..