Melodic signaling device on UMS microcircuits. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Musician

 Comments on the article

The use of microcircuits of the UMS series in electric musical instruments, automatic machines and toys has been repeatedly described in our magazine. In particular, in the collection of materials "On UMS microcircuits" ("Radio", 1995, No. 12), the authors shared their experience in improving the sound of electric jukeboxes, designing home bells with mains power, and eliminating the shortcomings inherent in some microcircuits of this series. The author of the published article continues the conversation on this topic.

The number of fragments of musical works recorded in the memory of each of the microcircuits of the UMS series usually does not exceed five. However, in the melodic signaling device, which is discussed in the article, you can use not one, but several such microcircuits, moreover, with non-repeating melodies. This will expand their set.

A diagram of one of the variants of such an EMR (without an AF amplifier) ​​is shown in fig. 1. It contains eight UMS microcircuits (for example, UMS-7, UMS-08, etc.) with various melodies recorded in their memory. The choice of microcircuits is carried out arbitrarily "and the choice of a melody inside each of them is made in a ring. When you press the start button SB1, a melody is played, each time different from the previous one.

(click to enlarge)

The digital part of the signaling device consists of a pulse generator for random selection of a melody, assembled on the elements DD1.1, DD1.2 and an integral timer DA1, a node for enumeration of musical synthesizers DD6-DD13, formed

DD2 chip elements, DD3 counter and DD4 multiplexer, as well as a clock frequency generator made on DD1.3,DD1.4 elements with a ZQ1 quartz resonator and a DD5 D-trigger.

In the initial state (standby mode), when the voltage of the power source is applied to the microcircuits of the device, the enumeration generator of musical synthesizers generates short, about 10 ms long, positive pulses that follow at a frequency of approximately 1 Hz, which are counted by the DD3 counter with a conversion factor of 8. At the same time, at the inputs 1,2,4 (pins 11, 10, 9) of the multiplexer DD4

there is a changing code, but switching of its analog input A (pin 3) with outputs X0-X7 (pins 13,14,15,12,1, 5,2,4) does not occur, since at the enable input S (pin 6) a high inhibit signal is present.

When you press the button SB1 "Start" once, the timer DA1 generates a positive pulse with a duration of 5 ... 6 s, which is inverted by the element DD1.2 and then fed to the input 9 of the element DD2.3 and the input S of the multiplexer. This pulse prohibits the passage of counting pulses to input C (pin 1) of the DDZ counter and simultaneously allows switching the analog input of the DD4 chip (pin 3) with one of its eight outputs X0-X7.

Random selection of one of the analog outputs of the multiplexer is due to the random moment of pressing the button SB1. As a result, a voltage of 13 V is applied to output 1,5 of one of the musical synthesizers for 5 ... 6 s - the time interval required to play the selected melody. At the same time, the front of the pulse of this signal pre-selects the melody that will be played at the next random access to the same musical synthesizer. This operation is implemented by the delay circuit R11C7. From the outputs of the DD6-DD13 microcircuits, the sequence of frequencies of the selected musical fragment through the decoupling diodes VDZ-VD10 is fed to the input of the final audio frequency oscillation amplifier.

At the end of the output pulse of the DAZ timer, the digital part of the signaling device switches to its original state, but the selected melody will be played to the end.

Clocking of musical synthesizers is carried out by pulses with a frequency of 50 kHz, obtained by dividing the frequency of a quartz oscillator (100 kHz) by 2. An overestimated, compared to the passport - 32 Hz, clock frequency is chosen in order to reduce the playing time of the longest fragments of musical melodies.

The circuit of the amplifier of the AF signaling device is shown in fig. 2. There is no point in dwelling on it in detail, since such amplifiers have already been described in "Radio" and, I think, are well known to readers.

There are no special requirements for the element base of the device. The start button SV1 can be of the KM type, the quartz resonator ZQ1 at a frequency of 100 kHz, the diodes can be any of the KD522, KD521, KD503 series. The static current transfer coefficient of the base of the transistor VT1 of the AF amplifier should be no more than 90, otherwise the oxide capacitor C2 may reverse the polarity and fail. Transistor KT815B VT2) will be replaced by GT404B, and KT814B (VTZ) - by GT402B. Dynamic head BA1 - any power of 1...3 W with a voice coil resistance of 4...8 Ohm.

The signaling device is assembled in the housing of the subscriber loudspeaker by surface mounting. UMS microcircuits are installed in contact sockets - for their quick replacement. With a significant length of wires coming from the start button, in order to avoid false positives from mains interference, they should be enclosed in a shielding braid and connected to the common wire of the device.

The signaling device is powered from the mains through a transformer that provides an alternating voltage of 7,5 ... 8 V to the secondary winding at a load current of up to 100 mA. Its digital part is powered by a stabilized voltage of 5 V (the integral stabilizer KR142RN5A is used), and the AF amplifier is fed by an unstabilized voltage of 9 ... 10 V directly from the rectifier. The maximum current consumed by the digital part is 12 ... 15 mA, and the AF amplifier is up to 70 mA.

Set up the device as follows. At the end of the installation of the UMS microcircuit, they are not yet inserted into the sockets. After turning on the power, by selecting the resistor R4, a voltage equal to 3 ... 4 V is set at terminal 1,5 of the multiplexer [DD1,6). 10 V. When you press the SB8 button, the pulse duration at pin 0,4 of the DA0,5 timer is controlled. Its duration can be changed by selecting resistor R1 (or capacitor C3), but it should not be less than 1...2 s. Next, musical synthesizers are installed in the sockets of the DD1-DD4 microcircuits and the operation of the device as a whole is tested.

To divide the frequency by two, instead of the D-flip-flop DD5.1, it is advisable to use the second half of the DD3 chip.

The generator on the elements DD2.1 and DD2.2 does not have to give out short pulses with a frequency of 1 Hz, you can exclude the diodes VD1. VD2, resistors R5 and R7, and reduce the capacitance of capacitor C5 to 1000 ... 5100 pF.

The inputs of all unused elements should be connected to the common or positive wire of the power source.

The total number of microcircuits can be further reduced by one if the signal from the output of the DD 1.2 element is applied as a prohibition signal to the CP input (pin 2) of the DD3 microcircuit. In this case, pulses to the CN input (pin 1) can be supplied from the generator output on the elements DD2.1, DD2.2 without elements DD2.3, DD2.4

Author: P.Redkin, Ulyanovsk

See other articles Section Musician.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive self propelled fluid 03.04.2017 At Brandeis University (Massachusetts), scientists have created a fluid that is capable of self-propelled. The movement of the liquid is set by animal cells dissolved in water, obtained from the brain of a cow. The fluid self-propelling properties are achieved due to the lability and mimicry of microtubules contained in the animal's brain cells. The cylindrical elements isolated from the cell have the ability to contract, adapting to the environment. The dynamics of the movement of the tubes sets the movement of the general environment in which the elements of the cell from the brain of a mammal are placed, since due to the cylindrical shape of the tubes, their movement has a predictable motion vector. The discovery is of practical importance, since the principle of operation of elements placed in a liquid can set the entire medium in motion according to specified parameters. In the field of oil transportation, this discovery promises to bring a significant economic effect, since it will allow abandoning gas pumping stations and units, the design of which does not correspond to the qualities of the oil being distilled, which has new properties. The practical significance of the discovery will also be found in other industries where dynamic controlled properties of liquids are required. Use outside of laboratory conditions requires additional studies.

Other interesting news:

▪ Improving the Reliability of Powerful Silicon Carbide Semiconductors

▪ Lighting LED Samsung LM301B

▪ Cheap and easy growing of living tissue

▪ The best decisions are made on an empty stomach

▪ New device for high-definition television

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Consumer Electronics. Selection of articles

▪ article How did you come to such a life? Popular expression

▪ article What familiar object helps to see through opaque frosted glass? Detailed answer

▪ Amazon River article. Nature miracle

▪ article Triac power regulator. Encyclopedia of radio electronics and electrical engineering

▪ article Riddles about water, rivers, lakes and seas

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