Parking locator on the LM380N chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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Of course, for a real parking locator, this is probably too simple a device. But it can be used in some toys or for other purposes, maybe just as an interesting experiment.
The device is a case, on the front panel of which there are two piezoelectric sound emitters. They are located on a soft surface (thin tight foam rubber) glued to the case. They are in the same plane and directed forward. If there is nothing ahead at a distance of more than 30 cm, the "device" is silent. When an object approaches, acoustic feedback begins to occur between the piezoelectric sound emitters, and generation occurs. As you approach the object, the sound increases and the tone of the sound changes. This can be used to judge the degree of approach to the object.
The circuit diagram is shown in the figure - these are just a few details.
The receiving acoustic unit (microphone) is a piezoelectric sound emitter B1. It is connected between the inputs of the A1 chip. This allows you to get the most sensitivity. Capacitor C1 adds positive feedback, bringing the amplifier mode closer to self-excitation. At the output, another similar piezoelectric sound emitter B2 is turned on.
The locator is powered by a DC source with a voltage of 9-12V. It can be a Krona battery or a car battery.
Piezoelectric sound emitters type 3P-22 or any other, without built-in generators. Wish they were in plastic cases.
Capacitors can be of any type, for example, C1 - K10-7V. and C2 - K50-35
Almost all parts are assembled on a printed circuit board made of foil fiberglass. Piezo sound emitters can also be placed on the board, but first stick foam pads under them so that there is no acoustic feedback through the board material.
If, when turned on, a sound is immediately heard, but there are no obstacles within 20-30 cm, this indicates the occurrence of AOS through the material of the printed circuit board. You can connect B1 on wires and place it away from the board, placing it on a table on a piece of foam rubber.
When an obstacle is presented (hands, books), sounding should begin.
Author: Skorogovorov L.V.
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