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Two antennas for CB radio station
HF Antenna Section. Sometimes radio amateurs try to squeeze as much output power out of their radio as possible without paying enough attention to the antenna (especially in portable radios). But the communication range largely depends on the operation of the antenna-feeder path, on how well it is matched with the transmitter output. The field strength indicator only provides an approximation of the antenna alignment. But with the help of an SWR meter, you can quite accurately tune the antennas, which will be described below. ... >>
Detectors for PLL receivers
Section Radio reception. The detectors (Fig. 1 and 2) for direct conversion FM receivers with phase locked loop frequency [1] offered to the attention of readers are made on the basis of a similar device described in [2]. Unlike the prototype, both of them have a high sensitivity, and the detector according to the scheme of Fig. 2, in addition, and higher selectivity. The detecting device, the scheme of which is shown in Fig. 1 is a frequency converter with a combined local oscillator, which simultaneously performs the functions of a synchronous detector. The input circuit L1C2 is tuned to the frequency of the received signal, and the local oscillator circuit L2C5 is tuned to a frequency half that. The conversion takes place at the second harmonic of the local oscillator, so the intermediate frequency lies in the audio frequency range. The local oscillator frequency is controlled by the VTI transistor itself by changing the capacitance of the collector junction, which depends on the output signal of the detector. The use of inductive coupling (L3) in the local oscillator made it possible to get rid of the resistor in the emitter circuit of the VTI transistor [2] and, thus, to provide greater amplification of the detector at audio frequencies, i.e., to increase its sensitivity (up to 50..,100 μV) ... >>
Frequency synthesizer for a radio station in the range 144-146 MHz
Section Frequency synthesizers. At present, the industry has mastered the production of a microchip of a single-chip frequency synthesizer built according to the prescaler scheme. This K1508PL1 chip is made using CMOS technology in a planar 14-pin package. The division coefficients are loaded into the control register of the microcircuit in a serial code. The microcircuit contains in its composition a frequency divider with a fixed division ratio (DFKD) and a frequency divider with a variable division ratio (CVD). The input is made through pin 4 of the microcircuit. The code has a length of 19 digits (Table 1), and the digits F0...F15 determine the division factor of the DPCD, and the digits R0...R2 - the division factor of the DPCD ... >>
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Articles on Voltage Stabilizers
Articles on voltage stabilizers; voltage stabilizer circuits; descriptions of voltage stabilizers: 173 articles
- Adjustable stabilizer option
- AC Voltage Regulator Option
- High Voltage DC Voltage Stabilizer
- Two simple analog stabilizers
- Bipolar voltage regulator, 2x15 volts 1 amp
- Two-channel stabilizer on a TDA2004 chip
- Bipolar voltage regulator with water cooling, 220/±41 volts 4 amps
- Additional protection of the stabilizer from overheating
- Refinement of the mains voltage stabilizer LPS-2500RV
- Switching stabilizers on the PWM controller KR1114EU4
- Switching buck regulator on the LT1074 chip
- Switching step-down stabilizer, 35-46 / 5,1-30 volts 4 amps
- Switching mains voltage converter
- Switching stabilizer
- Switching anode voltage stabilizer
- Switching regulator capacitor power supply
- Switching voltage stabilizer for a phone with caller ID
- Switching voltage stabilizer on KT825
- Switching voltage stabilizer with increased efficiency
- Switching voltage regulator, 20-35/15 volts 1 amp
- Switching voltage regulator, 8-60/5 volts 2 amps
- Switching DC voltage stabilizer, 220/5 volts 2 amps
- Switching regulator with protection, 12,6 volts 1,5 amps
- Switching regulator, 12 volts 4,5 amps
- Overload indicator and voltage stabilizer protection
- Gimbal overload indicator
- Key voltage regulator, 5 volts 2 amps
- Compromise (price / quality) switching stabilizer
- High Efficiency Linear Voltage Regulators
- High Efficiency Linear Regulators
- Linear stabilizer, 5 amps
- Low power bipolar stabilizer, 220 volts 200 milliamps
- Micropower Voltage Stabilizers
- Micro power precision stabilizer
- Micro power stabilizer with low consumption
- Microcircuit voltage regulator: protection node
- Multichannel voltage stabilizer on the BA4911 chip
- Powerful voltage stabilizers with current protection
- Powerful Switching DC Voltage Regulator
- Powerful switching regulator with high efficiency, 8-16/5 volts 10 amps
- Powerful bipolar voltage stabilizer for UMZCH
- Powerful voltage stabilizer for wind turbine
- Powerful voltage stabilizer, 5-30 volts 5 amps
- Powerful stabilizer with current protection, 50 volts 5 amps
- Powerful step AC voltage regulator
- Atypical use of stabilizers of the KR142EN8, KR142EN5 series
- Low Voltage Voltage Stabilizers
- Low-voltage voltage stabilizers on the chip KR142EN19
- Low Voltage Voltage Stabilizer
- Low voltage voltage regulator, 3,4-6/3-5 volts 0,4 amps
- About simple and powerful voltage regulators
- Reversible voltage converter
- Parallel connection of stabilizers 142EN5
- Powering the PWM controller chip and gate drivers with stabilized voltage
- Smooth switching on of the load of the integrated voltage stabilizer
- Step Up AC Voltage Regulator
- Precision filament stabilizer 11-24/6 (2,5) volts
- Application of integrated voltage stabilizers KR142
- The use of microcircuit stabilizers series 142, K142, KR142
- Application of thermally compensated optocouplers in voltage converters. Part 1
- Application of thermally compensated optocouplers in voltage converters. Part 2
- A simple switching regulator
- A simple switching regulator on a KREN142EN1 chip, 8-10/5 volts 5 amps
- A simple switching voltage regulator
- Simple switching voltage regulator, 9-25/5 volts 0,7 amps
- Simple switching regulator, 5 volts 400 milliamps
- Simple key voltage regulator, 15-25/5 volts 4 amps
- Simple powerful parallel transistor regulator, 12 volts 0,6 amps
- Simple powerful voltage regulator with short circuit protection, 42/15-38 volts 3 amps
- simple stabilizer
- A simple 45 volt voltage regulator
- A simple voltage regulator on a 142EN1G chip, 9/5 volts 0,5 amperes
- A simple voltage regulator with a high stabilization factor, 0,5 amps
- Simple voltage regulator with a high stabilization factor, 7-30/5 volts 0,5 amps
- Simple voltage regulator with short circuit protection, 15-38 volts 3 amps
- Simple double conversion voltage stabilizer, 9-12 volts 300 milliamps
- Simple Powerful Voltage Stabilizers
- Calculation of the stabilizer for a vibration pump
- Adjustable voltage stabilizers on the chip KR142EN19, 2,5-30 volts
- Adjustable bipolar voltage regulator
- Adjustable stabilizer 0,7-12 volts
- Adjustable voltage and current stabilizer
- Adjustable voltage regulator with current limit
- Adjustable voltage regulator, 1,2-30 volts 1 amp
- Adjustable voltage regulator, 35/32 volts 3 amps
- Adjustable voltage / current stabilizer, 220 / 1,25-25 volts 15-1200 milliamps
- Adjustable stabilizer, 30/3-25 volts 2 amps
- Voltage regulator with indicator
- Regulators of current, voltage, power
- Relay voltage stabilizer, 15-22/5 volts 10 amps
- Relay line voltage stabilizer
- Mains rectifier - voltage and current stabilizer
- Stabilizer overload alarm
- Line voltage signaling device
- Triac power controller
- Symmetrical dinistor in a transformerless power supply
- Symmetrical level converter - voltage stabilizer
- Table lamp stabilizer
- Engine stabilizer, 5,5-14/5 volts 150 milliamps
- Four voltage stabilizer
- Voltage stabilizer 35-70 volts
- Battery Voltage Stabilizer
- Voltage stabilizer in the network adapter
- Bicycle headlight voltage stabilizer
- Voltage stabilizer for car battery, 12,6/9 volts 0,3 amps
- Voltage stabilizer for power supply UMZCH, 19 volts 20 amperes
- Voltage stabilizer for UMZCH on the TDA2030 chip
- Voltage stabilizer for ULF, 12-15 volts 0,7 amps
- 35 volt voltage stabilizer
- CMOS Voltage Regulator
- Voltage stabilizer on the comparator, 19-30/5 volts 2 amps
- Voltage regulator on the ADP3301 chip
- Voltage regulator on a chip LX8384-00CP, 3-10 / 1,25-7 volts 5 amps
- Voltage stabilizer on the chip K142EN2
- Voltage stabilizer on the chip K174UN7, 8-16 volts 1 ampere
- Voltage stabilizer on the KR142EN19 chip with protection, 27/7-25 volts 2 amperes
- Voltage stabilizer on a powerful field-effect transistor
- Operational amplifier voltage regulator, 37/25,2 volts 0,2 amps
- Optocoupler Voltage Stabilizer
- Voltage stabilizer on the op-amp, 0,2 amperes
- AC Voltage Stabilizer
- AC voltage stabilizer, 135...270/197...242 volts 5 kilowatts
- Voltage stabilizer with double protection, 40/3-30 volts 2 amps
- Voltage stabilizer with protection against short circuit and overcurrent, 14-20/12 volts 0,5 amps
- Voltage stabilizer with short circuit protection, 14-16/9 volts
- Voltage stabilizer with overload protection, 10 amps
- Voltage stabilizer with overload protection, 13,8 volts 10 amps
- Voltage stabilizer with current protection on the chip KR142EN19
- Voltage stabilizer with protection, 14-20/12 volts 0,5 amps
- Voltage stabilizer with low minimum voltage drop
- Voltage regulator with parallel connected microcircuits, 5 volts 6 amps
- FET voltage regulator with overload protection, 14-24/10 volts 1 amp
- FET voltage regulator, 11-19/9 volts 0,1 amps
- Voltage stabilizer with thermal compensation
- Solar Voltage Stabilizer
- Voltage stabilizer, 10-16/9 volts 0-1 amps
- Voltage stabilizer, 11-20/9 volts 0,5 amps
- Voltage stabilizer, 20 volts 7 amps
- Voltage stabilizer, short-circuit protected output, 21/2-12 volts 0,3 amps
- Stabilizer with a small minimum voltage drop, 5-10/5 volts
- Mains voltage stabilizer
- Mains voltage stabilizer with microcontroller control
- Current stabilizer up to 150 amperes
- Stabilizer-charger with voltage and current regulation
- Stabilizers for roll
- Stabilizers on chips AMS1117хх
- Voltage stabilizers with a chip KR142EN19A
- Voltage stabilizers with a regulating transistor in the negative wire
- Stabilization Uout capacitor rectifier
- Stabilization of high voltages using low-voltage silicon zener diodes
- Stabilized power supply, 60 volts 0,1 amps
- Stabilized regulated power supply with overload protection, 220/0-30 volts 7,5 amps
- Zener diode as a ballast
- Switching regulator circuit
- Thyristor Voltage Stabilizer
- Transistor Voltage Regulators with Overload Protection
- Transistor voltage regulator
- Transistor stabilizer with short circuit protection, 15-27 volts 3 amps
- Trinistor power regulator
- Increasing the output current of a voltage regulator IC without significantly degrading its efficiency
- Improving the switching voltage regulator
- Battery charger
- Economic Stabilizers
- Economical Switching Voltage Stabilizer
- Economic Stabilizer
- Economic voltage stabilizer, 15/5-12 volts 100 milliamps
- Economical AC Voltage Stabilizer
- Economical Low Dropout Regulator
- Economic FET stabilizer, 10-20/9 volts 150 milliamps
- Economic stabilizer with protection system
- Electronic relay voltage stabilizer, 145-275 / 187-242 volts
- Electronic voltage regulator
- Efficient Switching Regulator
All articles on power supply
Latest news of science and technology, new electronics:
Using Apple Vision Pro during surgery
16.03.2024
The medical team at Cromwell Hospital in London used Apple Vision Pro for the first time during two spinal surgeries. This event confirms the headset's potential as a medical tool that will change the way surgical practice is performed. Although the doctors themselves did not use Vision Pro, the operating room nurse worked with virtual reality using glasses while preparing and performing procedures. The headset made it possible to view virtual screens in the operating room, select instruments and monitor the progress of the operation. Software developed by eXeX, a company that specializes in creating artificial intelligence-based applications for surgery, has significantly improved the patient care process. Using Apple Vision Pro opens up new opportunities for developing healthcare applications such as clinical education, surgical planning, training and medical imaging. Implementation of Apple Vision Pro in the medical industry ... >>
Carbon storage in the North Sea
16.03.2024
Norwegian Energy Minister Terje Åsland has announced the launch of the Longship project, which aims to create a central carbon dioxide storage facility in the North Sea. This ambitious project is valued at $2,6 billion and aims to apply CCS (carbon capture and storage) technology to mitigate the impact of climate change. Norway already has experience in CCS, thanks to the successful Sleipner and Snohvit projects, and is now looking to increase the amount of carbon sealed beneath the seabed. Longship's plan calls for capacity to capture and store 1,5 million tons of carbon annually over 25 years. Despite the positive outlook, there are concerns about the long-term consequences of such storage. However, proponents of the project argue that offshore carbon storage has a number of advantages, including minimal environmental impact. The Longship project is carried out with the participation of Equinor, Shell and TotalEnergies through the joint venture Northern Li ... >>
Mini-organs grown from human amniotic fluid
15.03.2024
An international team of scientists led by Professor Fan Xiulin from Zhejiang University has developed a unique method of growing mini-organs from cells found in human amniotic fluid. This significant medical breakthrough could lead to improved diagnosis and treatment of congenital diseases. The organoids, which are three-dimensional cellular structures that mimic organs on a smaller scale, were grown from lung, kidney and small intestine cells found in amniotic fluid. This method opens up new possibilities for studying various fetal conditions and may be the key to early diagnosis and treatment of birth defects. Although no treatment has yet been attempted, the scientists hope their research will help combat the serious congenital diseases that affect millions of newborns each year. This breakthrough could change medical interventions by making it possible to diagnose and treat congenital diseases. ... >>
Random news from the Archive Sony IMX324 Ultra-Sensitive Automotive Image Sensor
28.10.2017
Sony has introduced a new 7,72-megapixel IMX324 sensor. The sensor has 7,42 million effective pixels, the highest in the industry. Sensor aspect ratio 1/1,7. Sensitivity is determined at the level of 2666 mV. The resolution of the sensor is such that the camera using it is able to obtain a clear image of a road sign from a distance of about 160 meters. A man can't do that.
Such sensors are designed to work in ADAS (advanced driver-assistance systems) electronic driver assistance systems. This development, according to Sony, is compatible with the EyeQ4 and EyeQ5 image processors from Mobileye, previously acquired by Intel.
At night, the IMX324 sensors work both in "burst" mode with RCCC filters (red, three clean), when four adjacent pixels work as one (pixel binning mode) to increase sensitivity, and in alternating light / shadow mode. The pixel array for each frame alternately switches from high sensitivity mode for capturing images in dark areas of the scene, to capturing highlights in bright street lighting and in the light of car headlights. The final image, which is "glued together" by a specialized processor, is detailed and relatively contrasting in the shadows and in the light.
Sony IMX324 sensors are capable of capturing images with ambient light as low as 0,1 lux. It's like shooting under the light of a full moon on a cloudless day. Sensors will help to distinguish a pedestrian on the track and possible obstacles at a great distance. Sensors, which is typical for Sony, are multi-layered and designed for stacking, which allows you to make cameras with them compact.
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