Shooting sound simulator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
Comments on the article
The simulator is intended for use in children's electronic toys. It synthesizes a noise-like sound, reminiscent of automatic shooting, which is accompanied by LED flashes. A feature of the simulator is exclusively digital sound synthesis. It works from a low-voltage source (3...4,5 V), the average current consumption is 5...7 mA.
The basis of the simulator (see figure) is a digital noise generator based on DD1-DD3 microcircuits. The operation of such generators was described in detail in the article by M. Marder and V. Fedosov "Digital Noise Generators" in Radio, 1990, No. 8, p. 69-71.
On the elements DD1.1, DD1.2, a master oscillator is assembled, the pulses of which follow at a frequency of about 7500 Hz, and on the elements DD2.1, DD2.2 - an infra-low-frequency generator (about 10 Hz), which controls the operation of the tone generator on the elements DD2.3 , DD2.4 (about 750Hz).
The noise and modulated tone signals are fed to the adder, composed by resistors R4, R5, and then to the AF amplifier, made on the transistor VT1. Amplifier load - BF1 capsule (DEMSh-1, DEM-4m).
The output signal of the infra-low-frequency generator also controls the amplifier on the VT2 transistor, the load of which is the HL1 LED - it flashes in time with the sound messages. The simulator is turned on with the SB1 button.
Chips can be replaced with similar series K176, K561, but in this embodiment, the dimensions of the device will increase slightly. In addition to the transistors indicated in the diagram, it is permissible to use KT315G, AL307B-AL307G LEDs with the desired glow color. Resistors - MLT-0,125, capacitors - any small-sized ceramic, preferably stable TKE groups.
Power source - three RC63 elements (3,75 V) connected in series or another source for the voltage indicated in the diagram and with a capacity of at least 0,06 Ah.
Instead of the DEMSh capsule, you can install the ZP-1 emitter, which will almost halve the power consumption of the simulator at the same sound volume. Then, in the collector circuit of the transistor VT1, a resistor with a resistance of 6,8 ... 10 kOhm should be connected in parallel with the emitter, and the resistance of the adder resistors should be increased to 200 ... 300 kOhm. It is also advisable to change the frequency of the tone generator by setting it by selecting capacitor C3 close to the frequency of the natural mechanical resonance of the emitter - about 2800 Hz.
Establishing a simulator comes down to setting the desired sound by selecting capacitors C2, C3 and the brightness of the LED by selecting resistor R7. For reasons of economy, the current through the LED should not exceed 10 mA.
The generator on the elements DD1.1, DD1.2 will work more stable if the output 2 of the DD1.1 element is connected to a common wire (DD1.1 will work in repeater mode, without inversion), and the elements R1 and C1 are swapped.
Author: D. Pankratiev, Tashkent
See other articles Section Beginner radio amateur.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Traffic noise delays the growth of chicks
06.05.2024
The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>
Wireless speaker Samsung Music Frame HW-LS60D
06.05.2024
In the world of modern audio technology, manufacturers strive not only for impeccable sound quality, but also for combining functionality with aesthetics. One of the latest innovative steps in this direction is the new Samsung Music Frame HW-LS60D wireless speaker system, presented at the 2024 World of Samsung event. The Samsung HW-LS60D is more than just a speaker system, it's the art of frame-style sound. The combination of a 6-speaker system with Dolby Atmos support and a stylish photo frame design makes this product the perfect addition to any interior. The new Samsung Music Frame features advanced technologies including Adaptive Audio that delivers clear dialogue at any volume level, and automatic room optimization for rich audio reproduction. With support for Spotify, Tidal Hi-Fi and Bluetooth 5.2 connections, as well as smart assistant integration, this speaker is ready to satisfy your ... >>
A New Way to Control and Manipulate Optical Signals
05.05.2024
The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>
| Random news from the Archive Steam balloon will make it easier to launch satellites
28.08.2019
Scientists are working on a new, inexpensive and efficient system for launching satellites into space. A team of researchers at the Finnish Institute of Meteorology is exploring the possibility of using steam-filled balloons to launch satellites from them - instead of launching rockets from the surface of the Earth.
Steam balloons can be used to lift rockets to a certain height above the Earth for launch. The higher above the Earth, the lower is the air resistance, and therefore the efficiency of such launches is higher.
Launching satellites into orbit is greatly facilitated if the rocket rises to a certain altitude before launch, where the air is rarefied. Small rockets have already been launched from an airplane or balloon. However, using balloons filled with hydrogen or helium has its drawbacks: hydrogen is highly flammable and helium is expensive.
"On Earth, a hot air balloon fills with hot steam and then launches. As the balloon rises, some of the steam condenses. The condensation process releases a lot of latent heat, which slows down the cooling of the steam, helping it stay in a gaseous state," says lead author Pekka. Janhunen: After the balloon rises to the required height, the rocket is launched, its engines are turned on, and it soars into space. The balloon is freed from steam, it descends and can be reused."
The study presents a computer model that depicts the rise of a balloon filled with steam, followed by cooling of the steam at a height of 18 kilometers. The weight of the rocket can vary - it can be equal, for example, to 10 tons, which is enough to launch a satellite weighing several hundred kilograms. In addition to servicing rocket launches, steam balloons can also be used to lift other payloads into the stratosphere. However, this method is safe and inexpensive - at least on paper.
|
Other interesting news:
▪ Orangutan language deciphered
▪ Shoes with GPS will tell you the route
▪ Xerox Phaser 4NI and Phaser 3052DNI A3260 network printers
▪ Smart hydrogen cabinet
▪ Robot helps repair knee
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the website Basics of First Medical Aid (BFA). Selection of articles
▪ article Atmospheric emissions of the city-millionaire. Basics of safe life
▪ Where does the tax money go? Detailed answer
▪ Cinnamon article. Legends, cultivation, methods of application
▪ article Modification of Alinco DJ-191. Encyclopedia of radio electronics and electrical engineering
▪ article Water, fire, flowers. Focus Secret
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese