Various Circuits

Car Wiper-Speed Controller

Car Wiper-Speed Controller

This 12V wiper speed controller circuit uses the 555 timer. And can be fitted to any car. Its one of those very easy and usefull circuits!..

Car Voltmeter Circuit

Car Voltmeter Circuit

This screen uses ten LEDs to display a voltage range of 10.5 to 15 volts. Each LED represents a step 0.5wvolt tension. The heart of the circuit is the 3914 points LM / bar display driver. Trimming potentiometer R5 is adjusted so that 7.5 volts is applied to the upper side of the bulkhead. D2 resistor R7 and diode D5 to tighten the voltage applied to the LED 3 volts. A lowpass filter consisting of L1 and C2 guards against voltage spikes. The diode D1 is used to protect against reverse voltage where the voltmeter is connected backwards. ..

Model Glow Plag driver circuit

Model Glow Plag driver circuit

model airplanes, boats, cars and use of ignition of glow plugs for their miniature (O. Bcc to 15cc) internal combustion engines. These engines happen with the heavy batteries on board, HT coil, and "condenser" spark required for ignition classic, while simultaneously developing much higher RPM (and thus power) as the compression ignition (diesel) engines . The heart of a candle is a coil of platinum alloy filament heated to start the engine by an external battery, or 1. 5 volts or 2 volts. To complete this battery, a second power supply of 12 volts is often necessary to start the engine, together with a third type 6 volt electric fuel pump. ..

Car Exhaust Meter

Car Exhaust Meter

Bridge circuit contains two resistors lOO-ohm (R3 and R4), and two thermistors (Tl and T2). At room temperature, the resistance of T1 and 1'2 is about 2000 ohms. When they are each heated to 150 ° C by an RNA 10 current, the resistance value decreases to 100 ohms. So. the four elements include a bridge circuit. CO is a characteristic that conducts heat from a thermistor at a rate different from that of air. A thermistor, TI, is exposed to automobile exhaust, while the other, 1'2, is isolated in an environment of clean air. Unlike thermal conduction bridge imbalance. A voltage difference is caused between points A and C. A differential amplifier. VI, amplifies this difference and leads to the counter with a current sufficient to read the percentage of CO and air-fuel ratio. A control panel before the balance, R5, balances the bridge and calibrates the instrument. The calibration is performed when both thermistors are exposed to outside air. ..

CAR IMMOBILIZER CIRCUIT

CAR IMMOBILIZER CIRCUIT

A flip of 51 puts the system in action. Power for the circuit is captured from the ignition switch, and circuit receives no power until the ignition switch is closed. When the camera is turned on, the capacitor C1 is charged and the emitter follower Darlington pair (formed by Q1 and Q2) are cut, so no voltage is applied to the relay (Kl), which serves as a load QL transmitter. normally open relay contacts are connected through the points of the vehicle. (At this point, the relay contacts are open and have no effect on the ignition system). Cl charges through R, causing the voltage at the base of Ql to rise steadily. ..

Car windshield wiper delay

Car windshield wiper delay

The circuit provides a windshield wiper delay, dynamic braking and windshield wipers when they reach the rest position. This prevents the blades passing, which could lead them to stop at a point where they interfere with the vision of drivers. With the original wiper switch off, switch turns on the MLS delay circuit and disconnects the wiring SIB from automobiles. When SI is turned off, the original wiring system and controls the delay circuit is bypassed. ..

Car Alarm Security Circuit

Car Alarm Security Circuit

This car alarm circuit offers 18 seconds delay for the entrance and the exit. It sound continually for 6 minutes and automaticaly turns horn off and gets ready for the next trigering.....

Clever Car alarm circuit

Clever Car alarm circuit

When this car alarm circuit is activated it stays activated for 80 seconds. It has 15 seconds delay for the driver to enter and deactivate. and All timmings can be altered easilly.....

Auto-Arming Car Alarm circuit

Auto-Arming Car Alarm circuit

The car alarm here is a simple circuit with basic characteristics that cover all entrances at the car that has switches (doors etc).With one switch (arm-switch) the circuit waits for the sensor-switches to open and to activate it. So the horn with 1 sec pulses will sound imediatelly seconds so the driver can enter in car and disactivate the arming switch. ..

Automotive voltage tester schematic

Automotive voltage tester schematic

This is a simple spanniningszoeker that is very suitable for car, for connection of alarm systems, handsfree kits, radios, etc. At rest, the yellow LED because the path of least resistance. If the probe with a positive or negative pole connected is coming and the red or green and yellow LED light goes out. The yellow LED also serves as a check or put pressure on the circuit state...

Car Analog tachometer circuit

Car Analog tachometer circuit

This is a nice design for people who have no tachometer in the car or on the bike have. The circuit uses two ICs: an NE 555 and a CA 3140. The input of the circuit to the breaker of the motor (on the side that is not connected to ground). Thus, the ignition pulses within the circuit. By the two IC's, this signal then transformed into a speed-dependent voltage which is fed to the meter. The scale of the meter is 0 to 10 000 rpm. The circuit must be adjusted. For this, R6 IC2 temporarily disconnected. On R6 is a voltage of 4 V put. P2 is then adjusted so that the meter full scale deflection. ..

Automotive ignition coil

Automotive ignition coil

Here's a circuit to create a buzzcoil using a standard automotive ignition coil. A 556 dual timer is used to establish the frequency and duty cycle of the coil current. One of the timers is used as an oscillator to generate the 200 Hz rectangular waveform needed to control the (IRF740 MOSFET) while the second timer switches the oscillator on and off as the breaker points open and close (closed = on). The result is a steady stream of sparks from the ignition coil spaced about 5 milliseconds apart while the breaker points are closed. Pin 8 and 12 are the threshold and trigger inputs of one timer which are driven by the breaker points and produce an inverted signal at the timer output (pin 9). ..

Relay driver with a 555

Relay driver with a 555

This 555 timer circuit below toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and discharges when the output is low. When the button is pressed, the capacitor voltage is applied to pins 2 and 6 which causes the output to change to the opposite state. When the button is released, the capacitor will charge or discharge to the new level at the output (pin 3). ..

12V Battery Meter with 4 LEDs

12V Battery Meter with 4 LEDs

In the circuit below, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-) inputs are connected to successive points along a voltage divider. The LEDs will illuminate when the voltage at the negative (-) input exceeds the reference voltage. Calibration can be done by adjusting the 2K potentiometer so that all four LEDs illuminate when the battery voltage is 12.7 volts, indicating full charge with no load on the battery. ..

3 LED Car battery Indicator

3 LED Car battery Indicator

The operating principle of the circuit is very simple. The first Led D1 is placed in series with the resistor R2 and diode D4.An only be lit this LED indicates that the battery is ypofortismeni. For this reason Led D1 is red. If the voltage is greater than 12V, then netting R5 Z3 turns the transistor TR1, so the glows and Led D2 indicates that the battery of your car is okay and that is why color is green. Now, if the battery voltage exceeds 13,5 V in the same way it lights up and the third LED D3 in the middle of the transistor TR2.Stin cases this increase in voltage is detected by the panel R3 Z1 Z2.Afto means that your battery is yperfortismeni...

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