Two-tone electronic siren 2. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Two-tone electronic siren. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Digital technology

Comments on the article

On fig. 1 shows a schematic diagram of an electronic siren assembled on a single transistor and a microcircuit. Essentially, a siren consists of three generators with different timing characteristics. So. transistor V1, element D1.1, capacitor C1 and resistors R1 - R3 form a generator with a clock frequency of about 1 Hz. The desired repetition rate of the signals can be selected trimmer resistors R2 and R3.

Two tone electronic siren

Element D1.3, resistor R4. capacitor C2 and element D1.4 constitute the second generator with a generation frequency of about 1000 Hz. And finally, element D1.3, together with resistor R5, capacitor C3 and element D1.4, form a third generator, but at a lower frequency, about 200 Hz. The siren is terminated by loudspeaker B1 connected to the output of element D1.4.

In a two-tone siren, you can use the K155LA3 chip and any low-power silicon npn transistor, for example, KT315B.

Literature

"Eltktrotehnicar" (SFRY), 1976, No. 7

Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Digital technology.

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

Miniature gas analyzer Kingmax AirQ Check GS-01 for smartphone 07.12.2016

Volatile organic substances (VOCs), which include hydrocarbons, aldehydes, alcohols, ketones and other organic substances released into the atmosphere under normal conditions, can have a negative impact on human well-being and health. Their total concentration can be estimated using the AirQ Check GS-01 miniature gas analyzer, the release of which was announced by Kingmax.

The device connects to a smartphone and allows you to quickly find out if the permissible norm is exceeded, as well as determine the source of pollution - whether it be a piece of furniture, paintwork, detergent or cosmetic.

The analyzer is equipped with a micro-USB connector and is designed for use with a mobile device running Android OS. The dimensions of the GS-01 are 47,53 x 20,8 x 7,7mm. The analyzer draws up to 36 mA during operation.

Other interesting news:

▪ The kitchen sponge should be changed weekly

▪ New Microchip Instruments for Smart Sensors

▪ TEKTRONIX TDS7704 digital oscilloscope

▪ paper transistors

▪ Combat laser HELIOS

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Riddles for adults and children. Article selection

▪ article Forecasting and modeling the conditions for the occurrence of dangerous situations. Basics of safe life

▪ How was the “Viennese system” created and how was the Holy Alliance formed? Detailed answer

▪ article Unloading bitumen, tar, tar. Standard instruction on labor protection

▪ article Electronic call for a phone on a microcircuit. Encyclopedia of radio electronics and electrical engineering

▪ article Standards for testing electrical equipment and devices for electrical installations of consumers. Current transformers. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

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