The sound generator is like a siren. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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In order to get a high power sound signal (10 ... 20 W) from a simple sound generator, complex AF amplifiers are not required. The generator on the popular KR1006VI1 chip is connected according to the well-known "classical" scheme and does not need a description. The output signal frequency is approximately 1000 Hz. It can be calculated using the approximate formula:
where F values are in kilohertz. R1, R2 are in kiloohms, and C2 are in microfarads. The frequency can be adjusted to a significant extent by changing the values \u2b\u2bof CXNUMX and RXNUMX.
The output of the microcircuit (pin 3DA1) does not provide significant power, therefore, an UMZCH is implemented on the field-effect transistor VT1. Of course, you can also use a conventional bipolar transistor, for example. KT819BM, by connecting its emitter to a common wire, the collector to VA1, and the base to the 3DA1 terminal through a limiting resistor with a resistance of 470 ... 820 Ohm. However, in this case, a field effect transistor is preferable, since in the open state its drain-source junction has less resistance, which means that with a field effect transistor there will be a greater efficiency.
Instead of the BUZ11 field effect transistor, you can turn on the IRF521, IRF540 field effect transistors similar in electrical characteristics by installing them on heat sinks (with a dynamic head power of more than 5 W). All fixed resistors are MLT-0,25. MF-25. Dynamic head BA1 - any, designed for a power of 10 ... 20 W with a coil resistance of 4 ohms. With a higher resistance of the head, for example, 8 ohms, the power will decrease proportionally. Oxide capacitor C1 - K50-29 or similar, non-polar capacitors C2, C3 - KM-6. K10-17, KT4-23, KWS or similar. Capacitor C3, connected to pin 5 of DA1 for protection against interference, can be excluded from the circuit.
A stabilized power source is required. with an output voltage of 9 ... 15 V. The higher the voltage, the greater the output power of the amplifier. When using a powerful speaker (10 ... 20 W), an output current of at least 7 ... 10 A is required from the source.
Such a device can be used as an audible signaling of remote protected objects. In this case, the dynamic head BA1 is located directly on the street, and the signal is heard very far away.
Author: A.Kashkarov
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