Here is a simple Tachometer schematic. The basis of the frequency converter circuit-current, which converts the input signal into a proportional current measured pointer device. Deflection milliammeter proportion to the frequency input signal. To install the device on input pin A car should be connected to high voltage wire and pin B – to the mass of the vehicle.
The following diagram is the schematic diagram fo Car Horn, you may try this circuit for your car modification… Components List: R1 = 68K R2 = 2K2 R3 = 56K R4 = 3K3 R5,R6 = 4K7 R7 = 10K Pot/trimpot C1,C2 = 22nF C3,C5 = 100nF C4 = 1nF C6 = 220µF/25V IC1,IC2 = 7555 or TS555CN CMOS Timer ICs IC3 = TDA7052 SPKR = 8 Ohm
This car headlight alarm circuit can be set for one or two functions: First, to indicate that the head lights (or the side lights) should be switched off after switching off the ignition contact. With this circuit, there should be no dead battery due to headlights that were left on. Second, to indicate that the head lights should be on once ignition contact is switched on. Car Headlight Alarm Features:
This transistor ignition circuit give your car to have better starting and smoother running, particularly at very high and very low RPM. Lower fuel consumption, less pollution, lower servicing costs. Drive economically, drive electronically. Only for petrol/gasoline engines. This circuit will reduce breaker point wear and provide cleaner spark. Circuit diagram: Wiring diagram with the vehicles: