A device for listening to the noise of car mechanisms. Scheme, description

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A device for listening to the noise of car mechanisms. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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Car enthusiasts know how difficult it can be to find the source of extraneous noise in the car. There are many such sources: engine, transmission, exhaust system, wheels, body parts, air flows around the car when driving, etc.

Below is a simple device that can help in identifying and analyzing sources of noise, squeaks and knocks of a different nature, sometimes occurring only at a certain speed and various loads. The device allows you to diagnose the condition of bearings, valves, injectors, brake pads and many other mechanisms and assemblies.

Device for listening to the noise of car mechanisms
Fig. 1

The scheme of the device is shown in fig. 1. The signal from the BQ1 noise sensor is fed to the input of the bass amplifier DA1. Variable resistor R1 allows you to adjust the sensitivity of the device when listening to noise of varying intensity. The output signal goes to the headphones. Gain - up to 26 dB. Quiescent current consumption - no more than 9 mA.

Device for listening to the noise of car mechanisms
Ris.2

The design and dimensions of the sensor are largely arbitrary (Fig. 2). It consists of three parts - a base, a sensitive piezoelectric element and a flat magnet, which makes it easy to install the sensor on the machine unit under study and also easy to remove.

The base is made of metal - steel, copper, brass or aluminum alloy. As a sensitive element of the vibration sensor, I used a piezoelectric sound emitter from a musical postcard. The sensing element can be soldered to the base or glued with epoxy. After soldering a flexible shielded cable (its length is not critical), the element should be protected from moisture with a sealant. The shape of the base must protect the sensing element from accidental impacts.

On the side of the base opposite to the element, a small flat magnet is glued (or rigidly attached in any way). It must be strong enough to securely hold the sensor even on the suspension parts of the car when driving on rough roads. I used a magnet from a faulty computer hard drive.

The device is powered by a Krona galvanic battery or similar imported one. A 7D-0,1 battery is also suitable. The sensitive element in the sensor can be any piezoelectric sound emitter, for example, ЗП-19, ЗП-З.

Any phones with a resistance of about 8 ohms are suitable for working with the device. Widely used stereo phones with a resistance of 2x18 ohms for players can be used by connecting them in parallel on the X2 connector. If the sound volume in phones is not enough, it can be increased by connecting an oxide capacitor to pins 1 and 8 (plus to pin 1) with a capacity of 10 microfarads for a voltage of 10 V.

Device for listening to the noise of car mechanisms
Fig. 3

All parts of the device, except for the sensor, battery, variable resistor and connectors, are mounted on a printed circuit board made of foil fiberglass 1 mm thick. The drawing of the board is shown in fig. 3. The board tested in operation should be covered with a moisture-proof varnish.

The finished board is placed in a suitable, sturdy box with a battery compartment and space for mounting the gain control, power switch, and connectors. The power switch SA1 can be combined with a variable resistor R1.

The assembled device does not require adjustment. The view of the assembled device is shown in fig. four.

Device for listening to the noise of car mechanisms
Fig. 4

It is very interesting to use the device. It allows you to hear sounds that are usually not perceived by ear - the rustle of bearings, the chirping of nozzles and even the dripping of oil from the engine walls.

Author: B. Nefedov, Bryansk; Publication: radioradar.net

See other articles Section Automobile. Electronic devices.

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