Smart Turn Signal Circuit


Posted on Nov 2, 2012

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 will grow louder.Circuit waveforms. Point A shows the signal from the flasher. The voltage at point D will increase as long as the pin-3 output of IC1 (point C) remains high. The C1-R2 time constant (point B) determines how long the output will be high.Flasher terminal L connects to the load and X connects to the 12-volt supply. When the driver engages the turn signal, the L terminal voltage varies with the blinking lights. The STS senses the changing voltage and, after 15 seconds, it applies power to a buzzer through a current-limiting device to control loudness.


Smart Turn Signal Circuit
Click here to download the full size of the above Circuit.

This circuit reminds a driver that his turn signal has been left on for more than 15 seconds. When stopped for a light, the brake-on signal holds the warning off.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

TDA1554 / 22W Stereo Amplifier
Variable Square wave oscilator with 555 circuit
29Mhz-amplifier
Simple Momentary Switch with 555
microcontroller Arduino 230v Light bulb dimming
DIY intervalometer for Sony NEX
hall effect switch
simplest led flasher
Switching Delay Used by 555 Timer IC
Isolated send receive ring circuit diagram XTR105 RCV420
CF1 CF2 DC power supply circuit



Top