Electronic Drum. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

 Comments on the article

The program "Field of Miracles" is always popular with viewers. You can play a similar game yourself, for example, at school at a rest evening. It requires a game drum with sectors. We bring to your attention an electronic version of such a "drum".

As in the "Field of Miracles", the electronic "drum" has several sectors indicating the result of the "move" made by the participant. But unlike a TV game, the "drum" is motionless, and the LEDs flash alternately in the sectors, simulating the rotation of the "drum", and an audible signal is heard.

The "drum" scheme is shown in fig. 1. On the logical elements DD1.1 and DD1.2, a generator of rectangular (clock) pulses is assembled, and on the elements DD1.3, DD1.4 - an AF generator. After the SA1 switch supplies the supply voltage, one of the HL1-HL10 LEDs lights up. But the generators do not work at this time, because the input terminals 13 and 1 of their logic elements have a low voltage level.

When the button SB1 "Start" is pressed, the voltage is supplied to the input terminal 13 of the element DD1.1, as a result of which the capacitor C1 is charged. The clock generator starts to work. Its high-level pulses come from output 10 of the logic element DD1.2 to the input CN of the counter-decoder DD2, as well as to output 1 of the element DD1.3, allowing the operation of the AF generator. The AF pulses from the generator are fed through the resistor R7 to the audio frequency amplifier, made on the transistor VT1, and are reproduced by the BF1 capsule (DEMSh-1).

Clock pulses, arriving at the input of the counter-decoder, cause the sequential appearance of high-level signals at its outputs, the sequential opening of electronic keys on transistors VT2-VT11 and the ignition (also alternately) of the HL1-HL10 LEDs. Since the LEDs are arranged in a circle, a "drum spin" effect is created. The speed of "rotation" can be changed by a variable resistor R4.

After releasing the button, the clock pulse generator continues to work for some time - until the capacitor C1 is discharged. Then the generation stops, no pulses are sent to the counter, only one of the ten LEDs remains on. Naturally, the sound signal also stops, since a low-level signal appears at pin 1 of the DD1.3 element.

The next time you press the SB1 button, the process repeats.

The R5C3 circuit weakens the influence of the AF generator on the operation of the meter, the resistors R7 and R8 are current-limiting, the capacitor C5 weakens the interference penetrating the power circuits.

Structurally, the "drum" is made in a plastic case (Fig. 2) with dimensions of 143x84x45 mm. On the top panel of the case there is a sheet of drawing paper, on which a circle is drawn, divided into sectors with alphanumeric markings, as well as the inscriptions "ON" and "START". The top of the sheet is covered with a rectangular organic glass plate with holes for LEDs. The inscriptions in the sectors can be very diverse, borrowed from a popular game or invented by its organizers. The variable resistor is located in the center of the sectors.

Inside the case there is a battery (for example, 3336) and a printed circuit board (Fig. 3) made of one-sided foil fiberglass, on which all elements of the device are mounted, except for the button and switch.

If, when checking the device, there are malfunctions in the operation of the counter-decoder, it is necessary to select the resistor R5.

Author: S. Serkov, Barnaul

See other articles Section Beginner radio amateur.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Major risk factor for gambling addiction 07.05.2024

Computer games are becoming an increasingly popular form of entertainment among teenagers, but the associated risk of gaming addiction remains a significant problem. American scientists conducted a study to determine the main factors contributing to this addiction and offer recommendations for its prevention. Over the course of six years, 385 teenagers were followed to find out what factors may predispose them to gambling addiction. The results showed that 90% of study participants were not at risk of addiction, while 10% became gambling addicts. It turned out that the key factor in the onset of gambling addiction is a low level of prosocial behavior. Teenagers with a low level of prosocial behavior do not show interest in the help and support of others, which can lead to a loss of contact with the real world and a deepening dependence on virtual reality offered by computer games. Based on these results, scientists ... >>

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 ... >>

Random news from the Archive Mobile phone without battery 14.07.2017 Scientists from the University of Washington have developed a prototype mobile phone that can operate without a battery. As HotHardware writes, citing one of the leaders of the scientific group, Associate Professor Shyam Gollakottu, the phone "practically does not consume energy." It works according to the following algorithm - the device takes part of the required energy (microwatts of power) from the high-frequency signals of a base station located at a distance of about 10 m. It generates the other part of the energy from light using miniature LEDs. During operation, the phone as a whole consumes approximately 3,5 microwatts of energy and is therefore able to connect to the base station, sending and receiving a signal at a distance of about 15 m. In addition to a trial call from the prototype, the scientists were also able to make a call via Skype through their phone.

Other interesting news:

▪ The influence of social behavior on the risk of gambling addiction

▪ Scarecrow can run and swim

▪ 10" Fujitsu Arrows Tab Wi-Fi FAR70B

▪ RF block Microchip SST12LF09

▪ Synthetic molecules destroy allergies

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Cultivated and wild plants. Article selection

▪ article Crystal dream of my childhood. Popular expression

▪ article Which work of Stephen King causes readers to doubt its authorship? Detailed answer

▪ article Installer of internal sanitary systems and equipment. Standard instruction on labor protection

▪ article Grease for valve seals. Simple recipes and tips

▪ article Radio powered by free energy. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024