Automotive


Central Locking Interface

Some cheap car alarms do not have a connection for the central locking system. However, in most it should be possible to find a point in the alarm circuit which is high when the alarm is activated and low when it is off. This signal can then be used to drive this relay circuit to […]


The Distributor – Troubleshooting Automotive Ignition Systems

The intermittent stalling problem was solved by replacing the distributor. This is the sequel to troubleshooting my ‘86 Dodge Aries that defied logic and baffled my mechanic. To be sure, electronic engine controls like this are difficult to troubleshoot. Typical Schematic The long awaited Haynes repair manual arrived… and yes, it had nice schematic/wiring diagrams […]



Car Park Aid Circuit

Park Aid Three LEDs signal bumper-barrier distance Infra-red operation, indoor use Circuit diagram: Parts: R1 10K 1/4W Resistor R2,R5,R6,R9 1K 1/4W Resistors R3 33R 1/4W Resistor R4,R11 1M 1/4W Resistors R7 4K7 1/4W Resistor R8 1K5 1/4W Resistor R10,R12-R14 1K 1/4W Resistors C1,C4 1µF 63V Electrolytic or Polyester Capacitors C2 47pF 63V Ceramic Capacitor C3,C5 […]


Automotive Gate Driver IC

Automotive Gate Driver IC Engineersin the automotive space are faced with the challenges of delivering inverter designs with increased efficiency, higher drive current and greater immunity to noise, especially in hybrid electric vehicles (HEV) and electric vehicles (EV). To help designers meet these challenges, Fairchild Semiconductor, a leading global supplier of high performance power and […]


Advanced Automotive Tuner IC

Advanced Automotive Tuner IC Silicon Laboratories Inc., a leader in high-performance, analog-intensive, mixed-signal ICs, introduced the industry’s most advanced automotive tuner IC family designed to deliver the highest RF performance coupled with advanced signal processing while reducing the cost and complexity of car radio systems. Offering superior price/performance for the global car radio market, the […]


Automotive 3-Axis Gyroscope

Automotive 3-Axis Gyroscope STMicroelectronics, a global semiconductor leader serving customers across the spectrum of electronics applications and a leading supplier of MEMS (Micro-Electro-Mechanical Systems) sensors and automotive ICs, has introduced the market’s first 3-axis digital-output gyroscope that meets the industry-standard qualification for automotive integrated circuits (AEC-Q100). ST’s newest angular-rate sensor aims to add positioning accuracy […]


Car Temperature Gauge

The Car Temperature Gauge is basically the same circuit as March’s project with some minor changes to the input circuit. This circuit will display the water temperature to 1 degree resolution.


Petrol Gas Switch For A Pajero

My current vehicle, a Pajero, was modified for dual fuel – ie, petrol and gas. However, it’s necessary to run the vehicle on petrol at regular intervals to stop the injectors from clogging up. This simple circuit allows the vehicle to be started using petrol and then automatically switches it to gas when the speed […]


Automobile turn signal circuit

This is a simple circuit that can be used as a sequencial signal light in automobiles. The circuit is based on two ICs. A TS 555 CN CMOS timer IC and a CD4017 decade counter IC. The IC1 is wired as an astable multivibrator to trigger the counter IC. When triggered, the outputs of the […]