Old Pointer Voltmeter
It is an instrument for measuring voltage and is widely used in electrical engineering, electronic equipment and laboratories. Both DC and AC voltages can be measured and expressed in voltage units of volts. The basic principle of a voltmeter is to determine the voltage by measuring the change in the current in the circuit. Use pointers and dials to display voltage values, usually based on motor or electromagnetic principles. Although intuitive, it is not as good as a digital voltmeter in accuracy and response speed. Widely used in electrical equipment testing and maintenance, electronic circuit debugging, laboratory research and other occasions.
Stereo mixer
It is a professional equipment for audio signal processing, widely used in music production, live performances, radio stations and recording studios. It can amplify, mix, distribute, modify and process the sound quality of multiple input signals, and finally output a standard stereo signal. Its development is closely related to the progress of stereo technology. Stereo technology originated in 1931 and was invented by British electrical engineer Alan Bloom Rhine to solve the problem of audio-visual distribution in the recording process. With the passage of time, the function of the mixer has been enriched.
RF Broadcaster Broadcast Equipment
Used to transmit audio or data signals to a receiving device via radio waves. Widely used in wireless communications, radio stations, remote monitoring and other fields. Support a variety of modulation methods, can effectively transmit audio and data signals. Equipped with an efficient antenna system to ensure stable transmission and reception of signals. Support multi-user simultaneous reception of signals, suitable for broadcast stations and multi-point communication scenarios. It has an important market position in the field of wireless communication and broadcasting. As a key transmission equipment, the market prospect is broad. It is a powerful and widely used radio frequency broadcasting equipment, which is suitable for a variety of wireless communication and broadcasting scenarios.
Radmor 5100 Radio Receiver
Is a high-performance radio communication equipment, widely used in the field of professional communications. With excellent signal reception capability, it can accurately capture and demodulate signals in complex electromagnetic environments. Supports multiple modulation modes and is applicable to different communication scenarios. Advanced radio frequency technology and digital signal processing technology are used to ensure high sensitivity and low noise signal reception. Its compact design, easy to carry and operate, suitable for field operations and mobile communication. It is a professional equipment with comprehensive functions and excellent performance, suitable for users who need high-quality radio communication.
multimeter electronic instrument
It is an electronic measuring instrument used to measure electrical quantities such as voltage, current and resistance. Widely used in electronic technology and other related fields, it is an important tool to detect circuit problems and confirm the status of components. There are many types, including analog and digital, digital multimeters are more common because of more accurate readings and easier operation. There are usually multiple measurement gears, and the user can choose to measure voltage, current or resistance as needed. It is indispensable in the laboratory and industrial fields, and is also extremely popular among home repair and electronics enthusiasts. It is a commonly used tool in electronic engineering and physics teaching.
Retro Military Technology Radio
It refers to radio equipment used in early military communications. It has played an important role in the development of military communications, and its history can be traced back to the early 20th century. During World War I, the military relied primarily on telegraph and telephone lines for communication, but these wired means of communication were vulnerable and vulnerable to eavesdropping. The introduction of radio signals marked a major shift in communication, when Morse code was used to transmit information, making communication on the battlefield more flexible and mobile. Today, although technology is highly digitized and networked, the historical value of these early radio devices and their contribution to the advancement of communication technology cannot be ignored.
regulated power supply
It is an electronic device that can provide a stable DC voltage, and the output voltage can be maintained at a predetermined value regardless of changes in the input voltage or load current. It is widely used in equipment requiring stable voltage. It is usually composed of an ordinary power supply and a voltage regulation device, and its output voltage is not affected by changes in AC input voltage or load current. Compared with non-regulated power supplies, regulated power supplies can provide a more stable voltage, reducing output voltage changes caused by input voltage fluctuations or load changes, thereby protecting sensitive electronic components from damage.
ZR-04 broadcasting system
ZR-04 broadcasting system is an advanced IP network broadcasting system, widely used in schools, shopping malls, public venues and other places. It adopts industrial-grade dual-core processing chip, the startup time is less than 1 second, the power consumption is low, it has powerful data processing capabilities, no risk of virus infection, and it is safe and reliable. Supports multiple functions. It also supports environmental noise monitoring, automatically adjusts the terminal sound size, and provides information feedback. The design pays attention to user experience, the operation interface is humanized and the display is clear. When there is no operation, it enters the sleep, low-power power saving state. Support LAN and WAN.
American AN/GRR-5 Mobile Shortwave Receiver
Also known as "Angry5", it was a mobile shortwave receiver widely used by the United States military in the 1950 s and 1960 s. The frequency range is 1.5MHz to 18MHz, divided into four frequency bands, capable of receiving AM and CW (continuous wave) signals. The design is very sturdy and suitable for use in field environments. It adopts superheterodyne circuit design, has continuous tuning function, and can preset 10 channels. It also comes with built-in speakers and a headphone jack. It has an important historical position in the field of military communications, and is loved by collectors for its durability and versatility.
Sony Tony ICF-PRO80 Broadband Receiver
It is a portable broadband receiver produced by Sony, widely used in shortwave monitoring and communications. It covers the frequency range of 150kHz to 108MHz and supports multiple modulation modes. By connecting a FRQ-80 frequency converter, its frequency coverage can be extended to 115.15 to 216MHz. Equipped with digital LCD display and keyboard input function, it has 40 scanning memory positions and supports multiple scanning modes. The top is also provided with a headphone jack and a recording output interface. Compact design, easy to carry. The power supply is four AA batteries, which can also be powered by an external 6V DC power supply.
RF Signal Generator
It is an electronic test equipment capable of generating RF signals, widely used in wireless communications, radar, radio and television, satellite communications and other fields to provide high spectral purity, stable frequency and amplitude of RF signals, usually used to test and calibrate RF equipment. The core component is an oscillator, which can generate a radio frequency signal of the target frequency. It also contains components such as amplifiers, filters, and modulators to enhance the amplitude of the signal, filter out spurious frequencies and noise, and implement different communication functions. Support multiple modulation methods. It plays an important role in electronic equipment testing, RF system design and scientific research.
Russian military radio equipment
It is an important communication tool for radio technical units and special forces in the Russian armed forces. It has high encryption capability and anti-interference performance to ensure communication security in complex electromagnetic environment. With built-in encryption, it can work on very high frequency (VHF) and ultra high frequency (UHF) bands to provide secure and anti-interference communication. Support frequency hopping technology to avoid enemy interference. Radio equipment not only plays a key role in regular military operations, but also provides reliable communication support when special forces perform secret tasks.
cassette recorder
It is a device for playing and recording stereo tapes, widely used from the 1970 s to the 1990 s. It usually has two heads, one for playback and one for recording, and can handle stereo signals, providing a separate sound quality experience for left and right channels. It is designed to play music through built-in or external speakers, and can also record by connecting a microphone or instrument. Many models are also equipped with an automatic reverse function, which can automatically switch to the other side after the tape is played, making it convenient for users to listen to songs or record continuously. Many enthusiasts still treasure and use this device to relive the charm of classic music.
SWIFT SW380B Microscope
Is a high quality vertical binocular microscope, widely used in biological research, academic education and medical diagnosis and other fields. It has a double-layer mechanical stage to provide a stable observation platform. Its optical system uses a high-quality lens and objective combination to ensure a clear, high-contrast observation image. Equipped with an adjustable LED lighting system, it can provide uniform and stable lighting, so that the sample is fully illuminated during observation. Supports magnification from 40 times to 2500 times to meet different observation needs. Its design focuses on user-friendliness, easy operation, suitable for users of different ages and technical levels.
Stage Wedge Speaker
It is a kind of speaker specially designed for stage performance. Usually in a wedge-shaped design, it is placed at the front of the stage, facing the performer. It allows the sound to be transmitted directly to the performer's ear, helping them to better hear their own voice and the performance of other musicians, thereby maintaining pitch, rhythm and synchronization with the band. The main function is to provide performers with a clear listening effect so that they can play confidently when performing. It is usually composed of two or more sound paths to ensure the clarity and dynamics of the sound. It also has a good feedback suppression ability and can work stably at high volume. It plays a key role in improving the overall performance effect.
RA 801 MT Military Radio
It is a radio communication equipment designed for military use with a high degree of reliability and durability. It can work stably under harsh environmental conditions and is suitable for use in various complex battlefield environments. The device usually uses advanced encryption technology to ensure the security and confidentiality of communication. Support a variety of communication modes, including voice and data transmission, to meet the diverse needs of modern military communications. It has good anti-interference ability and can maintain a stable communication connection in the battlefield with complex electromagnetic environment. Its battery life is strong, can work for a long time without charging, and is suitable for long-term field missions.
Seismic instrument 3D animation model glb
A seismometer is a precision scientific instrument used to detect and record vibrations on the Earth's surface. Not only can it help scientists monitor earthquake activity and predict earthquake risks, but it can also be used to study the internal structure and plate movements of the Earth. Plays an important role in the fields of seismology, geology, and geophysics. In addition, the data from seismometers also has important reference value for building safety, urban planning, and disaster prevention. With the development of technology, modern seismometers can provide more accurate and real-time earthquake monitoring data.
Desktop low-temperature bottle centrifuge
3D model of high-pressure sterilizer
MD-500 modulation pedal
BOSS MD-500 is a powerful modulation pedal driven by advanced BOSS technology.
Sound Level Meter
Scientific instrument desktop centrifuge
Astronomical pentameter
The Astronomical Quintant, also known as the Astronomical Goniometer, is an ancient astronomical instrument used to measure the elevation angle of celestial bodies. It consists of a quarter arc and a movable cursor. The principle of the astronomical pentameter is based on the method of triangulation. When the observer raises the astronomical pentameter towards the sky, the cursor can move to align with the line of sight of a celestial body. Surveyors can determine the elevation angle of celestial bodies by reading the scale on the cursor. Usually, the scale on an astronomical pentameter is spaced at intervals of five degrees, hence it is called a pentameter.
Antique sextant telescope optical instrument
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