Intercom machine. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
Comments on the article
The intercom is designed for two-way hands-free communication.
(click to enlarge)
An intercom was made on one chip of the K237UN2 type and four transistors V1 of the MP39-MP42 type, V2 of the MP35-MP38 type, V3, V4 of the P213-P217 type.
In the receive mode, the machine is disconnected from its power source, and the speaker is connected to the line through normally closed contacts K1.2. Another correspondent who has a similar intercom must have the "Transfer" button turned on. In this case, power is supplied to the amplifier, relay contacts K1.2 connect the amplifier output to the line, and contacts K1.1 connect the speaker to the amplifier input. The "Call" button puts the amplifier into the mode of generating low-frequency oscillations.
Details. Relay K1 type RES-6; capacitors of the K50-6, MBM type, resistors of the MLT-0,125 - MLT-0,25 type; speaker type 0,1GD-6, bulb H1 at 13,6 V; communication line - telephone wire; power supply - three 3336L batteries connected in series.
See other articles Section Telephony.
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 Luminous target of the surgeon
03.06.2006
The parathyroid gland consists of two pairs of small, a few millimeters, outgrowths on the back of the thyroid gland.
This gland produces a hormone that regulates calcium metabolism in the body. Sometimes there is a benign increase in the parathyroid gland, the hormone is released too much, which threatens with diseases of the bones and kidneys. In such cases, surgeons remove part of the gland. The operation is painstaking and time-consuming due to the small size of the removed organ.
Physicians at the University Hospital in Mannheim (Germany) have found a substance that selectively accumulates in the parathyroid tissue and glows red when illuminated by the blue rays of the spectrum. This natural compound, protoporphyrin, is an integral part of the hemoglobin molecule and does not harm the body in any way.
A few hours before surgery, the patient swallows a protoporphyrin capsule. Glowing red fabric is easy to find and remove. The duration of the operation is reduced by almost half.
|
Other interesting news:
▪ Universal programmer with USB interface
▪ Found a place with lifeless soil
▪ GIS is useful for politicians
▪ Emergency power supply of the LED lamp up to 3 hours
▪ ASUS ROG G56JR gaming laptop
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ website section LEDs. Article selection
▪ article Bear your cross. Popular expression
▪ article Which animals can die from the growth of their own fangs? Detailed answer
▪ article Foreman of crop production. Standard instruction on labor protection
▪ article Amplifier on 6H13S lamps. Encyclopedia of radio electronics and electrical engineering
▪ article Simple FM detector. 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
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese