原创找到了不错的电路原理图参考电路，分享一下

 2011-7-6 12:45  2416 9 9 分类: EDA/ IP/ 设计与制造

12V battery level indicator for car batteries
12V to 9V car coverter
20 Segment Expanded Scale Voltmeter including a PCB design
3 Channel, 12 Volt Color Organ for a car
3rd brake light
5301 wideband fuel mixture display
80188XL Engine Tachometer / Race Computer
Adaptive Windscreen Wiper Control
Authentic Looking Knight Rider Led Project
Automatic Headlight Brightness Switch
Automatic headlight brightness switch
BMW R Series Motorcycle Regulator Schematic
Brakelight Flasher
Car acceleration meter
Car Alarm Arming Horn Beep Canceller
Car backup / reversing alarm
Car Battery Charger
Car battery charger
Car battery charger circuit
Car Battery Charger, an SCR Design with a 10 Amp rating
Car battery voltage tester using LM3914
Car burglar alarm circuit
Car Door Keypad Using LIN network
Car Nicad charger
Car OBD II J1850 PWM, J1850 VPW, ISO-9141 cables schematic pinout
Car OBDII diagnostic interface cable schematic pinout
Car power supply unit for digital projects, small car PCs etc
Car Timer with Atmel ATiny45 to automatically turn of accessories to prevent flat battery
Combination lock for car liftgate
Common Ground for Older VPW OBD Circuit
Custom USB tyre pressure monitoring system
Digital speedometer for cars with 7-segment display of speed
Economy radar detector
Electronic car ignition circuit
Engine control unit schematics
FCD (Fuel Cut Defencer)
Flashing / pulsing third brake like for cars
Flashing light / emergency beacon for vehicle
Fuel injector pulse width monitor
Grand Cherokee Off-Highway Lights
Headlight flasher
Headlight guard
Headlight reminder
Headlight timer
Hijack alarm
Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
Interior light extender
KITT (from Knight Rider) Car scanner using incandescant lamps
Large capacitor charge "controllers" (Car Audio)
Low battery cut-off circuit for a car or truck
Motorctcle turning signal system
Motorcycle battery charger
Motorcycle brake light flasher
Motorcycle low battery voltage warning circuit
Network car controller provides functions for remote door locks, headlight reminder, and car finder
Opendiag OBD-II Schematics & PCB Layout Opendiag OBD-II Schematics & PCB Layout
Parking aid senses distance to rear of vehicle
Portable CD Player Adapter For Car
Portable CD Player Adapter For Car
Pseudo car alarm system
Seatbelt reminder circuit
Simple car battery charger
Simple car battery voltage monitor
Simple Car Preamplifier and Artificial Earth
Simple Vehicle Loop Detector (inductive loop for driveway etc)
Speed alert - wireless portable unit
Synchronized multi-spark module (SMSM) for Electronic Ignition Devices (EID)
Third brake light pulser circuit
Two LED trouble light system
Ultrasonic parking sonar electronic circuit diagram using transistors and 4000 series CMOS
Vehicle Telemetry Platform based on an Arduino
Volvo 164 electric fan thermostat
Wide Band Fuel Mixture Display
Wiper Speed Control
Wireless Auto Tachometer
Wireless Auto Tachometer

完整列表LINK:
http://kitarm.com/news/327-electronic-circuits-or-diagram.html
以上仅供学习参考。

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