car reverse beeper

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

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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