There are 71 circuit schematics available in this category. Click here for all circuit diagrams. Last circuit added on Sunday, 28 June 2015.

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CircuitCategoryDate AddedOK?Votes 
12V battery level indicator for car batteriesAutomotive -1
Car burglar alarm circuitAutomotive 0
Flashing light / emergency beacon for vehicleAutomotive 0
Headlight guardAutomotive 0
Interior light extenderAutomotive 0
Seatbelt reminder circuitAutomotive 0
Two LED trouble light systemAutomotive 0
Simple car battery voltage monitorAutomotive 0
Car Battery Charger, an SCR Design with a 10 Amp ratingAutomotive 0
Low battery cut-off circuit for a car or truckAutomotiveSep 23, 20090
Car power supply unit for digital projects, small car PCs etcAutomotive 0
Large capacitor charge "controllers" (Car Audio)Automotive 0
Speed limit alertAutomotiveJul 05, 20120
Park-Aid - Three LEDs signal bumper-barrier distanceAutomotiveJul 05, 20120
Headlight FlasherAutomotiveJul 05, 20120
Car Voltage Gauge with 7-segment readoutAutomotiveJul 05, 20120
Car Water Temperature Gauge with 7-segment readoutAutomotiveJul 05, 20120
Automotive Speed IndicatorAutomotiveJul 05, 20120
Simple but reliable car battery tester using LM3914AutomotiveJul 05, 20120
Automotive 12V to +-20V converter (for audio amplifier)AutomotiveJul 05, 20120
Electronic car ignitionAutomotiveJul 05, 20120
Car battery charger with automatic cutoffAutomotiveJul 05, 20120
Automatic Headlight Brightness SwitchAutomotiveJul 05, 20120
Dome Lamp DimmerAutomotiveJul 05, 20120
Loud 10-W Car Alarm SirenAutomotiveOct 03, 20130
Opendiag OBD-II Schematics & PCB Layout Opendiag OBD-II Schematics & PCB LayoutAutomotive 0
Digital speedometer for cars with 7-segment display of speedAutomotiveJun 28, 20110
Pseudo car alarm systemAutomotiveFeb 05, 20100
Network car controller provides functions for remote door locks, headlight reminder, and car finderAutomotiveMay 16, 20100
Adaptive Windscreen Wiper ControlAutomotiveApr 14, 20030
12V 300W 4 channel car amplifier schematic diagramAutomotiveJul 03, 20110
15W mono car amplifier using TA7227PAutomotiveJul 03, 20110
6W mono car amplifier using BA521 or BA532 amplifier moduleAutomotiveMay 25, 20120
Volvo 164 electric fan thermostatAutomotiveFeb 25, 20110
Car OBDII diagnostic interface cable schematic pinoutAutomotiveSep 10, 20060
Car OBD II J1850 PWM, J1850 VPW, ISO-9141 cables schematic pinoutAutomotiveSep 10, 20060
Grand Cherokee Off-Highway LightsAutomotive 0
Engine control unit schematicsAutomotiveNov 16, 20020
Car Alarm Arming Horn Beep CancellerAutomotiveSep 01, 20090
Portable CD Player Adapter For CarAutomotiveSep 01, 20090
Car Battery ChargerAutomotiveSep 01, 20090
Automatic Headlight Brightness SwitchAutomotiveSep 01, 20090
Wireless Auto TachometerAutomotiveSep 01, 20090
Hijack alarmAutomotive 0
Car acceleration meterAutomotive 0
KITT (from Knight Rider) Car scanner using incandescant lampsAutomotive 0
Headlight reminderAutomotiveJan 26, 20010
Wiper Speed ControlAutomotive 0
Simple car battery chargerAutomotiveJun 18, 20030
Flashing / pulsing third brake like for carsAutomotiveFeb 21, 20050
Headlight flasherAutomotiveFeb 21, 20050
Speed alert - wireless portable unitAutomotiveFeb 21, 20050
Parking aid senses distance to rear of vehicleAutomotiveFeb 21, 20050
Automatic headlight brightness switchAutomotiveFeb 21, 20050
Economy radar detectorAutomotiveFeb 21, 20050
Authentic Looking Knight Rider Led ProjectAutomotive 0
Custom USB tyre pressure monitoring systemAutomotive 0
80188XL Engine Tachometer / Race ComputerAutomotiveOct 24, 20020
Ultrasonic parking sonar electronic circuit diagram using transistors and 4000 series CMOSAutomotive 0
3rd brake light circuit diagramAutomotiveJan 26, 20010
Car backup / reversing alarmAutomotive 0
12V to 9V car coverter circuit diagramAutomotiveJan 26, 20010
Third brake light pulser circuitAutomotive 0
Motorcycle battery chargerAutomotive 0
Motorcycle low battery voltage warning circuitAutomotive 0
Motorcycle brake light flasherAutomotive 0
Motorctcle turning signal systemAutomotive -1
Car Nicad chargerAutomotiveJan 26, 20010
Combination lock for car liftgateAutomotiveJul 24, 20020
Car Timer with Atmel ATiny45 to automatically turn of accessories to prevent flat batteryAutomotive 0
Common Ground for Older VPW OBD CircuitAutomotiveMay 01, 20040