There are 71 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Saturday, January 28, 2023.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
12V battery level indicator for car batteriesAutomotive Status9 vote up vote down
Car burglar alarm circuitAutomotive Status2 vote up vote down
Flashing light / emergency beacon for vehicleAutomotive Status-1 vote up vote down
Headlight guardAutomotive Status4 vote up vote down
Interior light extenderAutomotive Status-2 vote up vote down
Seatbelt reminder circuitAutomotive Status4 vote up vote down
Two LED trouble light systemAutomotive Status-1 vote up vote down
Simple car battery voltage monitorAutomotive Status0 vote up vote down
Car Battery Charger, an SCR Design with a 10 Amp ratingAutomotive Status-6 vote up vote down
Low battery cut-off circuit for a car or truckAutomotiveSep 23, 2024Status2 vote up vote down
Car power supply unit for digital projects, small car PCs etcAutomotive Status0 vote up vote down
Large capacitor charge "controllers" (Car Audio)Automotive Status2 vote up vote down
Speed limit alertAutomotiveJul 05, 2024Status-3 vote up vote down
Park-Aid - Three LEDs signal bumper-barrier distanceAutomotiveJul 05, 2024Status-2 vote up vote down
Headlight FlasherAutomotiveJul 05, 2024Status3 vote up vote down
Car Voltage Gauge with 7-segment readoutAutomotiveJul 05, 2024Status-1 vote up vote down
Car Water Temperature Gauge with 7-segment readoutAutomotiveJul 05, 2024Status1 vote up vote down
Automotive Speed IndicatorAutomotiveJul 05, 2024Status0 vote up vote down
Simple but reliable car battery tester using LM3914AutomotiveJul 05, 2024Status1 vote up vote down
Automotive 12V to +-20V converter (for audio amplifier)AutomotiveJul 05, 2024Status-1 vote up vote down
Electronic car ignitionAutomotiveJul 05, 2024Status0 vote up vote down
Car battery charger with automatic cutoffAutomotiveJul 05, 2024Status-4 vote up vote down
Automatic Headlight Brightness SwitchAutomotiveJul 05, 2024Status3 vote up vote down
Dome Lamp DimmerAutomotiveJul 05, 2024Status0 vote up vote down
Loud 10-W Car Alarm SirenAutomotiveOct 03, 2024Status1 vote up vote down
Opendiag OBD-II Schematics & PCB Layout Opendiag OBD-II Schematics & PCB LayoutAutomotive Status-1 vote up vote down
Digital speedometer for cars with 7-segment display of speedAutomotiveJun 28, 2024Status-1 vote up vote down
Pseudo car alarm systemAutomotiveFeb 05, 2025Status-3 vote up vote down
Network car controller provides functions for remote door locks, headlight reminder, and car finderAutomotiveMay 16, 2024Status-1 vote up vote down
Adaptive Windscreen Wiper ControlAutomotiveApr 14, 2024Status-1 vote up vote down
12V 300W 4 channel car amplifier schematic diagramAutomotiveJul 03, 2024Status3 vote up vote down
15W mono car amplifier using TA7227PAutomotiveJul 03, 2024Status2 vote up vote down
6W mono car amplifier using BA521 or BA532 amplifier moduleAutomotiveMay 25, 2024Status0 vote up vote down
Volvo 164 electric fan thermostatAutomotiveFeb 25, 2025Status-1 vote up vote down
Car OBDII diagnostic interface cable schematic pinoutAutomotiveSep 10, 2024Status-2 vote up vote down
Car OBD II J1850 PWM, J1850 VPW, ISO-9141 cables schematic pinoutAutomotiveSep 10, 2024Status0 vote up vote down
Grand Cherokee Off-Highway LightsAutomotive Status-1 vote up vote down
Engine control unit schematicsAutomotiveNov 16, 2024Status0 vote up vote down
Car Alarm Arming Horn Beep CancellerAutomotiveSep 01, 2024Status0 vote up vote down
Portable CD Player Adapter For CarAutomotiveSep 01, 2024Status-2 vote up vote down
Car Battery ChargerAutomotiveSep 01, 2024Status-3 vote up vote down
Automatic Headlight Brightness SwitchAutomotiveSep 01, 2024Status-2 vote up vote down
Wireless Auto TachometerAutomotiveSep 01, 2024Status0 vote up vote down
Hijack alarmAutomotive Status-2 vote up vote down
Car acceleration meterAutomotive Status-3 vote up vote down
KITT (from Knight Rider) Car scanner using incandescant lampsAutomotive Status-1 vote up vote down
Wiper Speed ControlAutomotive Status1 vote up vote down
Simple car battery chargerAutomotiveJun 18, 2024Status-1 vote up vote down
Flashing / pulsing third brake like for carsAutomotiveFeb 21, 2025Status-2 vote up vote down
Headlight flasherAutomotiveFeb 21, 2025Status-3 vote up vote down
Speed alert - wireless portable unitAutomotiveFeb 21, 2025Status0 vote up vote down
Parking aid senses distance to rear of vehicleAutomotiveFeb 21, 2025Status-1 vote up vote down
Automatic headlight brightness switchAutomotiveFeb 21, 2025Status-1 vote up vote down
Economy radar detectorAutomotiveFeb 21, 2025Status-2 vote up vote down
Authentic Looking Knight Rider Led ProjectAutomotive Status-1 vote up vote down
Custom USB tyre pressure monitoring systemAutomotive Status-1 vote up vote down
80188XL Engine Tachometer / Race ComputerAutomotiveOct 24, 2024Status-1 vote up vote down
3rd brake light circuit diagramAutomotiveJan 26, 2025Status-1 vote up vote down
Car backup / reversing alarmAutomotive Status0 vote up vote down
12V to 9V car coverter circuit diagramAutomotiveJan 26, 2025Status-2 vote up vote down
Third brake light pulser circuitAutomotive Status-1 vote up vote down
Motorcycle battery chargerAutomotive Status-3 vote up vote down
Motorcycle low battery voltage warning circuitAutomotive Status-2 vote up vote down
Motorcycle brake light flasherAutomotive Status0 vote up vote down
Motorctcle turning signal systemAutomotive Status-2 vote up vote down
Car Nicad chargerAutomotiveJan 26, 2025Status-1 vote up vote down
FCD (Fuel Cut Defencer)AutomotiveOct 30, 2024Status0 vote up vote down
Combination lock for car liftgateAutomotiveJul 24, 2024Status-1 vote up vote down
Car Timer with Atmel ATiny45 to automatically turn of accessories to prevent flat batteryAutomotive Status-4 vote up vote down
Common Ground for Older VPW OBD CircuitAutomotiveMay 01, 2024Status-1 vote up vote down
Speed Alarm For CarsAutomotiveJul 15, 2024Status3 vote up vote down