Circuit - Automotive Electronic Circuits Designed by David A. Johnson, P.E.


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Battery Chargers Alarms Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Friday, August 29, 2008 02:34 PM

Master Category List - Dave's Circuits

125KHz Wireless Smart Key Detector
This circuit will turn on an indicator light whenever it detects a smart car key containing an RFID chip. (added 7/06)

Automotive 12v Electrical System Voltage Indicator
This battery powered unit is designed to quickly aid troubleshooting of 12v electrical systems in a car. Three LEDs proved a visual indication of a +12v, ground or an open circuit voltage level.

Automotive Electrical Voltage Indicator
This circuit will indicate if an automotive electrical circuit has zero volts or 12 volts present. (added 7/06)

Check Engine Beeper
When wired into a car’s indicator light panel, this circuit will turn on a loud beeper when the “check engine” light turns on. (added 7/06)

Fake Car Alarm Light
Whenever the car’s ignition is turned off, this circuit activates a flashing LED, which can be positioned to appear as an active alarm system. (added 7/06)

Voltage Indicator
When troubleshooting the 12v electrical system of an automobile, it is nice to have a simple voltage indicator tool instead of a voltmeter. This electronic circuit, hobby circuit is powered by two AA or even two N cells, which will provide enough energy for years of service. The circuit has only two leads...

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