Backup Beeper


Posted on Dec 1, 2012

When the vehicle`s backup lights kick on, or when the manual switch (SI) is closed, a small current is fed to the base of Ql.


Backup Beeper
Click here to download the full size of the above Circuit.

Transistor Ql allows current to flow through it and, if the enable switch (S2) is closed, it sends 12 V to Ul, a 555 timer. Timer Ul sends high pulses that last 0.97713 s and low signals that last 0.488 565 s to the base of Q2. When Ul switches Q2 on, it sends 12 V to BZ1, a piezoelectric buzzer. For best results, the buzzer should be mounted under the vehicle—somewhere where people around the car can hear the warning beeps.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Ultrasound Detector with 567PLL and LM386 ICs
Power supply for 25-watt arc lamp
High speed sample and hold
Personal Message Recorder Circuit
50MW Audio Amplifier circuit
diy solar cell phone usb charger
Solar Cell Voltage Regulator
Solar Automation Switch Hardware
CMOS interface circuit and the switching amplifier



Top