There are 73 circuit schematics available. Last circuit added on Tuesday, 19 May 2015.

CircuitCategoryDate AddedOK?
Car Water Temperature Gauge with 7-segment readoutAutomotiveJul 05, 2012
Automotive Speed IndicatorAutomotiveJul 05, 2012
Simple but reliable car battery tester using LM3914AutomotiveJul 05, 2012
Automotive 12V to +-20V converter (for audio amplifier)AutomotiveJul 05, 2012
Electronic car ignitionAutomotiveJul 05, 2012
Car battery charger with automatic cutoffAutomotiveJul 05, 2012
Automatic Headlight Brightness SwitchAutomotiveJul 05, 2012
Dome Lamp DimmerAutomotiveJul 05, 2012
Large capacitor charge "controllers" (Car Audio)Automotive 
Speed limit alertAutomotiveJul 05, 2012
Park-Aid - Three LEDs signal bumper-barrier distanceAutomotiveJul 05, 2012
Headlight FlasherAutomotiveJul 05, 2012
Car Voltage Gauge with 7-segment readoutAutomotiveJul 05, 2012
Hijack alarmAutomotive 
Car acceleration meterAutomotive 
Flashing / pulsing third brake like for carsAutomotiveFeb 21, 2005
Headlight flasherAutomotiveFeb 21, 2005
Speed alert - wireless portable unitAutomotiveFeb 21, 2005
Parking aid senses distance to rear of vehicleAutomotiveFeb 21, 2005
Automatic headlight brightness switchAutomotiveFeb 21, 2005
Economy radar detectorAutomotiveFeb 21, 2005
Low battery cut-off circuit for a car or truckAutomotiveSep 23, 2009
Seatbelt reminder circuitAutomotive 
Two LED trouble light systemAutomotive 
Simple car battery voltage monitorAutomotive 
Car Battery Charger, an SCR Design with a 10 Amp ratingAutomotive 
12V battery level indicator for car batteriesAutomotive 
Car burglar alarm circuitAutomotive 
Flashing light / emergency beacon for vehicleAutomotive 
Headlight guardAutomotive 
Interior light extenderAutomotive 
Car power supply unit for digital projects, small car PCs etcAutomotive 
Digital speedometer for cars with 7-segment display of speedAutomotiveJun 28, 2011
Network car controller provides functions for remote door locks, headlight reminder, and car finderAutomotiveMay 16, 2010
Adaptive Windscreen Wiper ControlAutomotiveApr 14, 2003
12V 300W 4 channel car amplifier schematic diagramAutomotiveJul 03, 2011
15W mono car amplifier using TA7227PAutomotiveJul 03, 2011
6W mono car amplifier using BA521 or BA532 amplifier moduleAutomotiveMay 25, 2012
Grand Cherokee Off-Highway LightsAutomotive 
Engine control unit schematicsAutomotiveNov 16, 2002
Car Alarm Arming Horn Beep CancellerAutomotiveSep 01, 2009
Wireless Auto TachometerAutomotiveSep 01, 2009
KITT (from Knight Rider) Car scanner using incandescant lampsAutomotive 
Headlight reminderAutomotiveJan 26, 2001
80188XL Engine Tachometer / Race ComputerAutomotiveOct 24, 2002
Vehicle Telemetry Platform based on an ArduinoAutomotiveJun 20, 2010
Ultrasonic parking sonar electronic circuit diagram using transistors and 4000 series CMOSAutomotive 
Third brake light pulser circuitAutomotive 
Motorcycle battery chargerAutomotive 
Motorcycle low battery voltage warning circuitAutomotive 
Motorcycle brake light flasherAutomotive 
Motorctcle turning signal systemAutomotive 
FCD (Fuel Cut Defencer)AutomotiveOct 30, 2002
Common Ground for Older VPW OBD CircuitAutomotiveMay 01, 2004
Loud 10-W Car Alarm SirenAutomotiveOct 03, 2013
Opendiag OBD-II Schematics & PCB Layout Opendiag OBD-II Schematics & PCB LayoutAutomotive 
Pseudo car alarm systemAutomotiveFeb 05, 2010
Volvo 164 electric fan thermostatAutomotiveFeb 25, 2011
Car OBDII diagnostic interface cable schematic pinoutAutomotiveSep 10, 2006
Car OBD II J1850 PWM, J1850 VPW, ISO-9141 cables schematic pinoutAutomotiveSep 10, 2006
Portable CD Player Adapter For CarAutomotiveSep 01, 2009
Car Battery ChargerAutomotiveSep 01, 2009
Automatic Headlight Brightness SwitchAutomotiveSep 01, 2009
Wiper Speed ControlAutomotive 
Simple car battery chargerAutomotiveJun 18, 2003
Authentic Looking Knight Rider Led ProjectAutomotive 
Custom USB tyre pressure monitoring systemAutomotive 
3rd brake light circuit diagramAutomotiveJan 26, 2001
Car backup / reversing alarmAutomotive 
12V to 9V car coverter circuit diagramAutomotiveJan 26, 2001
Car Nicad chargerAutomotiveJan 26, 2001
Combination lock for car liftgateAutomotiveJul 24, 2002
Car Timer with Atmel ATiny45 to automatically turn of accessories to prevent flat batteryAutomotive