car reverse beeper


Posted on Feb 6, 2014

After installing in the car (Not running but with it in reverse and with emergency brake on) it also worked good! The when I started the car and backed out of the garage the beeping frequency became very eratic as I tapped the brake or turned the steerin


car reverse beeper
Click here to download the full size of the above Circuit.

g wheel. Apparently the small output voltage to the Pizzo changes. I don`t know how sensitive piezo buzzers are to applied voltage - especially the one you have. I`d experiment by applying different voltages to the buzzer to see what happens - if for no other reason than to rule out or rule in the voltage variation that you suspect as a cause. You might also establish whether or not you`ll be satisfied with the performance of the buzzer at other voltages. I`d also have someone observe the backup lights. I`d guess this is where your circuit tells your alarm that you are in reverse. If the backup lights are flickering you might want to repair that first then move on. I don`t know what your circuit does - maybe it`s a voltage regulator already - I`m not sufficiently skilled to recognize the circuit. It would seem that an LM317 would do the job directly off the backup light circuit but that`s just a shot in the dark, so to speak. It`s simply two astable multivibrators, with a slow one gating a fast one, so you get the `beep, beep, beep` noise. There isn`t any need to have a regulator feeding it, if there`s a problem it`s either a constructional fault, or a problem with the car electrics. It could be ignition and/or alternator noise. You might try adding 100 ohms in series with the +12V line, with a BF cap (at least 100uF) to GND from the junction of the 100 ohms and the beeper. Alarms such as these are required here in US on...




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

TV Modul½±tor
Auto Baud Rate with PIC18F2455
Digital Clock Timer schematic
LED operates as light sensor
Personal Message Recorder Circuit
Magnetic Proximity Switch Circuit
Ladder Tutorial
infra red ir led flood light circuit
GSM Remote Control Module
MIDI Drum Machine Schematic Main CPU Section
One-way operation of a dynamic braking circuit
Two-way touch switch 4
Secret Ethernet optical wireless communication drive circuit diagram
Using tap potentiometer loudness circuit



Top