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
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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...

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