Engine Block Heater Minder Circuit
If you live in the frozen north, knowing your engine-block heater is working is a comfort. This device will let you know if yours is okay. Plug in PL1 to your ...
Automotive Audible-Turn Indicator Circuit
This little circuit should be useful to the hearing impaired. It produces a tone each time a dashboard turn indicator lights....
Auto Turn-Signal Reminder Circuit
This circuit counts turn signal flashes. At the end of about 70 flashes, a chime sounds to remind the driver to turn off the turn signal. By using various taps...
Time-Delay Auto-Kill Switch Circuit
The automobile delayed kill switch is simple in concept. When you get out of your car, a secretly located pushbutton switch is pressed. Nothing apparently happ...
Power Controller (For Automotive Accessories) Circuit
Because the power controller is powered from the vehicle`s accessory switch, the load can receive power only when the ignition key is on. Using half of a dual ...
Flashing Brake Light Circuit
When power is first applied, three things happen: the light-driving transistor (Ql) is switched on because of a low output from U2, pin 3; timer Ul begins its ...
Thermostat Switch For Automotive Electric Fans Circuit
The circuit, is based on a commercial temperature sensor (TS6178) and an MC3334P ignition chip, When the radiator temperature increases, the sensor pulls the b...
Manual Headlight/Spotlight Control For Autos Circuit
Pressing the START pushbutton turns on either the headlights or spotlights for a predetermined time. After 1 minute (Rl and CI determine this),...
Smart Turn Signal Circuit
STS schematic. The Q2 gate voltage increases with the charge on C3. After 15 seconds of charging, the buzzer will warble. As the charging continues, the sound ...
Cd Ignition System For Autos Circuit
At the heart of the CD4-MX is an astable multivibrator, built around Q1 and Q2, that feeds step-up transformer Tl. The output of 1 is rectified by D3 to D6 and...
12V Auto-Powered Circuit For Cassette Recorders
A regulator allows you to power a 7.5-V cassette recorder or other device from a 12-Vdc au...
Digital Tachometer Circuitry
This system can be used with 4-, 6-, or 8-cylinder automobiles. The timebase formed by IC5 is an oscillator th...
Windshield Wiper Interval Controller
The windshield wiper interval circuit presented here is very compact and is noteworthy for its use of ...
Electronic Ignition
This electronic ignition circuit is intended to be inserted into a car"s conventional ignition system. In effect, it re...
Solid-State Windshield-Wiper Delay
In the wiper-delay schematic shown, with the ignition on, Dl maintains regulated +12 Vdc. When SI closes...
Automobile Lights-On Reminder
The circuit can be used to give a visible or an audible warning that the headlights are on. It uses a 2N1305 ...
Night Safety Light For Autos
This circuit turns on the brake lights of a parked car when the headlights of an oncoming car are detected, wa...
Car Headlight Control
It is annoying to realize that you have left your car headlights on only to find that the battery is flat. One possib...
Lights-On Warning
Because power for the circuit is obtained from the car"s side lights, the circuit can"t oscillate unless the lights are o...
Third Brake Light
The circuit is designed to light (via SCR1 and SCR2) only when both the left and right brake lights are activated. The ci...