Musical strobe. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Musician

 Comments on the article

Electronic devices that provide various light-dynamic effects are widely used at discos, youth parties, etc. In the days of my youth, schoolchildren themselves “riveted” light-dynamic devices, pasted over the globe with pieces of mirrors and hung it under the ceiling of the classroom. With such a design, class and school discos were a success, invaluable experience was gained, self-esteem grew among the designers of this lighting equipment. Today, when "almost everything" can be bought, the amateur performance of schoolchildren has noticeably subsided, but here and there, "guys with soldering irons" are still noticeable, and there is hope that time has no power over radio amateurs.

One of the options for a light-dynamic installation for a disco is a stroboscope using flashes with different frequencies of an IFC-120 flash lamp. Such a lamp was used in industrial flashlights ("SEF-ZM" and similar). Of the unnecessary or faulty flash lamps, only two obligatory parts are needed - the IFC-120 lamp and a pulse transformer. The body can also be used. A simple revision comes down to assembling the electronic assembly, the diagram of which is shown in the figure. The device can operate in two modes, depending on the position of the switch SA2. In the first mode, the lamp flash frequency is controlled using a variable resistor R7, which changes the charge time of the capacitor C5. In this case, the frequency of the generator on the unijunction transistor VT1 changes accordingly.

In the second mode, the generator pulses (and the lamp flash frequency) depend on the external signal applied to the input of the device. The use of a matching transformer T1 with a transformation ratio of 1:8 allows you to control the frequency of the generator with an audio frequency voltage with an amplitude of 0,3 ... 1 V. Such a signal can be, for example, a musical signal from the output of the AF amplifier.

The required input signal level is regulated by a variable resistor R10. The alternating voltage of the audio frequency after R10 is rectified by the diodes VD4 and VD5 and charges the capacitor C9 through R5. The time of its charge and the switching frequency of the transistor VT1 are determined by the amplitude of the input signal. When VT1 is triggered, a pulse enters the control electrode of the thyristor VS1, which leads to its unlocking. An open thyristor closes the circuit, and the capacitor C4 is discharged through the primary winding of the pulse transformer T2 and VS1. In the secondary winding of this transformer, a high voltage pulse (about 3,6 kV) is formed. This pulse ionizes the gas in the lamp, a short-term discharge occurs, which we see as a light flash.

Details. Transformer T1 - industrial, brand TOT-205. Transformer T2 is a regular transformer from a flash lamp. In the diagram, dots mark the beginning of its windings. During operation, the T2 transformer may make low whistling sounds - this is its normal mode. The capacitance of the capacitor C4 is selected within 0.1 ... 0,022 μF. For stable operation of the stroboscope, capacitor C5 must be with a low leakage current, for example, K53-1A, K53-18. The remaining oxide capacitors are of the K50-29 type. Capacitors C4, C6 - type K73-3. Fixed resistors, except for R1, - MLT, R1 - type VER. Thyristor VS1 can be replaced with KU202 with indices L-N.

A properly assembled device practically does not need to be configured. If the elements are in good condition and there are no installation errors, it starts working immediately. On the plates of the capacitor C3 there must be a constant voltage of 280 ... 300 V.

Attention! High-voltage capacitors in the device are able to retain charge for some time after being disconnected from the network, therefore, it is possible to work with circuit elements only after they are completely discharged.

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 Passport on iPad allowed to cross the American border 07.01.2012 Canadian citizen Martin Reisch crossed the US border, presenting at the checkpoint not a passport, as required by law, but a scanned version of it, stored on an Apple iPad tablet computer. For some reason, when he went on a trip, he left the document at home and went to America to deliver Christmas presents to the children of his friends. Stopping at the border to check documents, Martin showed his driver's license to the border guards, and instead of a real passport, he tried his luck with his scan, because the trip home would have taken a long two hours. Luck was on the traveler's side. After considering the situation, the border guard gave the go-ahead to cross the border. By the way, Reisch returned to Canada on the same day and again showed a scan of the passport on the iPad. And again he crossed the border without hindrance. It is possible that the border guards subsequently received disciplinary sanctions, but the main thing is that the children received their legitimate gifts. And the rest is details.

Other interesting news:

▪ NASA will send astronauts to Venus

▪ Production of cell membranes

▪ ASUS ROG Matrix GeForce RTX 2080 Ti graphics card

▪ Metabolism fast and slow

▪ The sun influences the rate of radioactive decay

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 Action of ultraviolet radiation. Basics of safe life

▪ article What drug was officially issued to Wehrmacht soldiers? Detailed answer

▪ article Mechanic for the repair of instrumentation and automation. Job description

▪ article Luminous paints. Simple recipes and tips

▪ article Automatic charger. 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