Lighting

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. ..

Touch switching 12V Light

The circuit on the right uses three bipolar transistors to accomplish the same result with the touch contact referenced to the negative or ground end of the supply. Since the base of a bipolar transistor draws current and the current gain is usually less than 200, three transistors are needed to raise the microamp current level through the touch contacts to a couple amps needed by the light. For additional current, the lamp could be replaced with a 12 volt relay and diode across the coil...

12 Volt Lamp Dimmer schematic

Here is a 12 volt / 2 amp lamp dimmer that can be used to dim a standard 25 watt automobile brake or backup bulb by controlling the duty cycle of a astable 555 timer oscillator. When the wiper of the potentiometer is at the uppermost position, the capacitor will charge quickly through both 1K resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness. ..

Car Light Dimmer 12 Volt

This unique circuit makes your dome light look cool. Usually when the car door is closed, the dome light just goes OFF. With this circuit, you can have our dome light fade slowly in brightness and finally go OFF. This slow dimming of the light gives a very good feeling at night. It looks very romantic! The circuit can be explained as follows: When the car door is open, the push to off switch of the door is ON and hence it charges the 22uF capacitor fully. The opamp is acting as a voltage follower and its output is same as the voltage across the capacitor, which is 12V when the capacitor is fully charged. Due to a high voltage at the output of the IC, the transistor saturates, turning ON the bulb to full brightness...

Brakelight Stop flasher

This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1.5 sec by varying the preset VR1...

Car brake Light

What's so special about this circuit? Well, the first third-brake light I installed I had to pull a wire from the Third Brake Light all the way underneath the carpet to the brake-pedal-switch and I thought it would be easier to pluck the signal of both brakelights via the trunk. Bench-test your circuit first and apply power to the circuit, with the brakelight connected, for at least a couple of minutes. ..

Car Stop Light Switch Circuit

When the brake pedal is on depressed, battery positive voltage normally applies through the STOP fuse and stop light switch to terminal STP of the ECU, and the ECU turns the cruise control off. A failsafe function is provided so that cancel functions normally, even if there is a malfunction in the stop light signal circuit. If the harness connected to terminal STP has an open circuit, terminal STP will have battery positive voltage and the cruise control will be turned off. Also, when the brake is on, the magnetic clutch is cut mechanically by the stop light switch, turning the cruise control off. (See page DI572 for operation of the magnetic clutch)...

12 Volt Dimmer control

This circuit uses an MC3392 low side protected switch and an MC1455 timing circuit to form an automotive instrumentation panel lamp dimmer control. The brightness of incandescent lamps can be varied by Pulse Width Modulating the input of the MC3392. The modulating signal can be obtained directly from the MC1455 timer (or a microprocessor). The MC1455 is configured as a free-running clock having a frequency and duty cycle control. The typical timer frequency is approximately 80 Hz when the frequency potentiometer is adjusted to 1.0k. This frequency was chosen so as to avoid any perceptible lamp flicker. ..

Nite Rider LED Lights

IC4, C1, R1 and R2 are used for the clock pulse which is fed to both the counters IC2 and IC3 Pin 14. IC1 is a Flip Flop and is used as a switch to enable ether IC2 or IC3 at pin 13. IC7a detects when ether IC2 or IC3 has reached Q9 of the counter pin 11. IC5, IC6 and IC7a protects the outputs of the counters IC2 and IC3 using OR gates which is then fed to the Anodes of the LED's 1 to 9...

KIT CAR Lights circuit

This custom mod gives your computer the personality of KITT, the computerized car from Knight Rider TV fame. The project is a light display which imitates the dot in KITT's hood. It looks like the scanning eye of the car's computer that is so smart it has a personality and acts autonomously. Some people have said the computer shows more emotion and personality than the main actor, David Hasselhoff. The effect has variable speed to suit your taste, and a power switch to turn it off. After all, this much bright motion seen from the corner of your eye will grab your attention and rip your eyeball out of its socket. I'd hate to be responsible!..

Car rear Stop Light Flasher

When we step on the car' s brake, then together with the classic rear STOP ,the third STOP which is situated in the middle of the back half of the car also switches ON. This is the classic function , is to be found in all modern cars. The difference with the circuit is that when we "step on the brake " then the third STOP switches ON and OFF rhythmically once a second , three times, it then reverts to it' s normal functioning, remaining constantly switched ON, with the provision that we will continue to " step ON" the brake. If we leave the brake, the STOP switches off ,waiting useful for drivers who come from behind and are relatively alert their attention, with the result that we avoid a visit from behind, with the corresponding consequences. ..

Car central Light Dimmer

A useful operation for the cars is delayed extinguishing internal lighting cabin of passengers, after close some door of car. Certain cars allocate this operation from their constructor. Oldest sure do not allocate such operation. This delay makes this circuit. In the scheme appears the delay circuit as well as a typical circuit of connections of lamp L1, usually 12V 10W, with the switch S1 choice of lamp operation. In place A the lamp L1 remains continuously turned on, because the switch is in the place of 0V. In place B the lamp it remains off and in place C the lamp it turns on and she remains turned on all hour some door is open, hence somebody from the switches that are found in each door have closed have given the 0V in the lamp. If now the door close, the corresponding switch go open, but the C1 is already charge, discharge by the Q1 and makes the Q4 close...

This is a 2 LED flashing circuit. It is based on an analog flip flop circuit. This particular circuit was calculated to use blue or white 3V LED with a 12V power supply. If you are using red green or yellow LED, replace the 1K resistors for a 2.2K. This circuit will flash the led at a 1 sec interval in alternance. For faster or slower flashing speed, you can increase or decrease the 100K resistors. ..

This unique circuit makes your dome light look cool. Usually when the car door is closed, the dome light just goes OFF. With this circuit, you can have our dome light fade slowly in brightness and finally go OFF. This slow dimming of the light gives a very good feeling at night. It looks very romantic!..

This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1.5 sec by varying the preset VR1...