Top Frequency Counter Circuit Design

sara-u 12V Power HAM Radio 40M CW Shortwave QRP Pixie Transmitter Receiver Module 7.023MHz-7.026MHz for DIY Kit CW Receiver Transmitter

  • This circuit is most early by the foreign design,is the most Junior Amateur Radio choice! Kit using amateur radio electric door band....
  • This suite is PIXIE low power transceiver classic, recommend the use of search Pixie QRP,will see a lot of English website of its introduction..
  • This QRP Pixie Kit not fished,is diy kit,suite welding need electronic technology basis,please bring your own multimeter and electric iron tool..
  • when receiving the vibration frequency is 7.023-7.026MHz adjustable,can easily beat frequency, greatly facilitate the primary lovers enjoy radio....
  • Kit consists of the modifications to the original design circuit PIXIE,now launch of the vibration frequency is fixed at 7.023MHz,.
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Display Digital Signal Frequency Counter PLJ 6LED H LED Signal Generator Cymometer Tester Frequency Measurement Modules Adjustable Module 0.1~1000MHz(Backlight Font red)

  • Test Accuracy: The frequency meter is designed with dual intermediate frequencies. The intermediate frequency value and the addition and subtraction mode can be preset separately without affecting each other, which can achieve high stability and high resolution. The tester has good sensitivity, better than 60mVPP.
  • Excellent Performance: The frequency reference uses a temperature compensated voltage controlled crystal oscillator. The display driver adopts LED display special chip, the digital tube has high brightness and less external interference.
  • Small and Convenient: This module is compact and exquisite in design, can be put into a pocket, does not occupy extra space, is convenient to carry, and has reliable performance, good visual effects, and low cost.
  • Convenient to Operate: The circuit of the frequency meter is simple, the design structure is reasonable, and the unique two key control method and precise time algorithm are used to make the operation simple and fast.
  • Multi Function: The circuit is simple, the structure is reasonable, double button control, and the operation is simple. Each setting is automatically saved, and the power is on.
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New Cornet ED88TPLUS5G EMF RF 5G TRI Field Detector by Safe Living Technologies Inc.

  • IMPROVED FREQUENCY COUNTER: The Frequency counter function has been extended to 4.2GHz which covers all the 5G network frequency bands including the 3.5GHz 5G C-band..
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XCFDP 15MHz DDS Signal Generator Counter,High Precision Dual-Channel Function Generator Arbitrary Waveform Frequency Meter 2.4’’ Screen 200MSa/s 15MHz

  • 【EASY TO OPERATE】Convenient operation interface, superior technical indicators and humanized graphic style. Its sine wave frequency output can....
  • 【SIGNAL STABILITY】The signal generator adopts large-scale FPGA integrated circuit and high-speed MCU processor, and the internal circuit adopts....
  • 【FREQUENCY METER FUNCTION】It supports scanning output from low frequency to high frequency or from high frequency to low frequency. The scanning....
  • 【HIGH PRECISION】This signal generator adopts dual-channel DDS signal and TTL electric level output to generate accurate, stable, low-distortion....
  • 【WIDE APPLICATION】The signal generator has excellent amplitude-frequency characteristics, small and beautiful appearance, and intuitive control....
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7-80V PWM DC Motor Speed Controller Switch 30A,Motor Speed Control Regulator

  • 1️⃣ 7-80V PWM DC Motor Speed Controller Switch 30A,Motor Speed Control Regulator.
  • 2️⃣ Wide voltage 7-80V high current 30A Design Wide range of applications, on-board switch with operation Stop brake function, adjustable potentiometer soft cable can be separated Line length 30CM..
  • 3️⃣Circuit optimization design Wide range of duty cycle adjustment, smooth motor without vibration, no vibration, with power indication, stable circuit design for long working hours..
  • 4️⃣Adopt imported high-voltage MOS tube, three high-voltage 100V high-frequency resistance capacitors, and fuses for braking. The parameters are not easy to heat and easy to replace. The standard aluminum housing protects the internal circuits and components for long-term durability..
  • 5️⃣Package Contents:1 x 7-80V PWM DC Motor Speed Controller Switch 30A.
  • Amazon satisfied customer service & fast ship..
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WSDMAVIS 1Set Ceramic Discs Mist Maker Atomization Plate with 5V Mini USB Humidifier Module Integrated Circuit Board Driver with Timing Switch DIY

  • High frequency oscillation,more finer particles,large and stable atomization amount, timing shutdown..
  • USB humidifier special micro hole atomization film, surface anti-oxidation silver layer protection coating, the front side is white piezoelectric ceramic ring, the back is all steel material, waterproof solder joint, to prevent open circuit..
  • Diameter of outer silicone ring: about 20mm.
  • Our atomizer plate with 5V frequency driver board, it is more convenient compared with other product. You can start the board via the button after power the module.The atomizer plat should be used with the same frequency circuit board so as to achieve the ideal spray volume..
  • Please refer to the picture for the detailed information of the circuit board structure diagram, wiring diagram and atomizer size diagram..
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Wouxun KG-UV9D Plus Transmission Seven Bands Reception Two Way Radio with FM Radio and Air Band (Standard)

  • Seven Bands Reception and Dual Bands Transmission Wider frequency ranges meet different demands. The frequency range is from 76MHz to 965MHz, including FM radio and air band.
  • Classic Circuit , Excellent Performance Mature circuit design and high quality electronic components, after years of use can still maintain stable performance.
  • ship from US warehouse directly , takes 3-5 working days to arrive ..
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AudioPipe APCLE-3002 Class AB 2 Channel 1500W MAX Car Audio Sound System Power Amplifier Kit with Bass Knob, RCA Input/Output, and Overload Protection

  • HIGH-PERFORMANCE AMP: Upgrade your audio system to this high-performance class D monoblock amplifier boasting 1,800 watts of RMS power and variable Ohm for bumping bass and full sound.
  • 4 ohms: 750 watts RMS x 1, 2 ohms: 1,100 watts RMS x 1, 1 ohm: 1,800 watts RMS x 1.
  • CUSTOMIZED SOUND: Bass-boost frequency and level adjustable for customized bass, adjustable subsonic and low-pass filter for hitting all frequencies, 1-Ohm load stability, and phase adjustability.
  • Bass boost: 0 12dB, Variable bass boost frequency: 30Hz 80Hz.
  • SAFETY FEATURES: MOSFET circuit design with overload, short-circuit, thermal, and low-voltage protection to keep your device safe and running smoothly.
  • BRIDGEABLE DESIGN: Easy bridging operation for versatile use.
  • INCLUDES: Package includes 1-channel power amp, bass knob, and mounting hardware.
  • Dimensions (L x W x H): 17 x 7 x 2.2 inches.
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Wouxun KG-UV9D Plus Seven Bands Reception Ham Two Way Radio

  • This model has been FCC certified, FCC ID: AOCRXM170418050-09. Certified Original WOUXUN radio, To avoid counterfeit models - insure your listing shows "sold by ABBREE".
  • Dual Band , Cross Band Repeater , Large Color Screen With two independent receivers for both UHF and VHF, you can listen to either the same or different bands simultaneously , large color screen can display more information.
  • Classic Circuit , Excellent Performance Mature circuit design and high quality electronic components, after years of use can still maintain stable performance.
  • Seven Bands Reception and Dual Bands Transmission Wider frequency ranges meet different demands. The frequency range is from 76MHz to 965MHz, including FM radio and air band.
  • Using High Quality Plastic and Rubber Material High quality plastic can make the shell more robust and durable good rubber material can make the button has a good touch feel.
  • Shipping from US Warehouse, shipping days 3-12 working days..
  • 【How to Program frequency?】 (Refer to KG-UV9D Plus） https://www.wouxun.cn/ZuoPin/VideoPlay.aspx?vname=uv9dp03 【Product instruction manual】 (download from the official website) http://en.wouxun.cn/.
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HiFi Headphone Amplifier Portable 3.5mm Stereo Earphone Audio Amplifier 200Mah Lithium Battery Mobile Phone

  • HIGH DEFINITION STEREO SOUNDYou can improve the sound quality of your smartphone so that you can enjoy high definition pure stereo sound without losing the truth.DescriptionDescription:.
  • Are you still worried about this? Every time you listen to a song on your cell phone, the sound is stiff, dry and cold. Low frequency reduction is insufficient, listening is weak, audio output has digital flavor bias. From now on, you won't be troubled by these problems any more. This sound amplifier can help you solve all the sound problems. You deserve a try..
  • Positive and negative dual power technology.
  • Low resistance impedance matching circuit network.
  • High and low frequency dynamic compensation tuning circuit network.
  • No-output capacitance, ground plane reference output design.
  • High efficiency charge and radiation suppression circuit.
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Fanmusic TRUTHEAR x Crinacle Zero Earphone Dual Dynamic Drivers in-Ear Earphone with 0.78 2Pin Cable Earbuds (Zero)

  • ...a diameter of 10mm and the other diameter of 7.8mm. ZERO offers the smooth, soft and detailed sound thanks to the mature internal magnetic circuit structure co-worked with flexible polyurethane suspension composite LCP liquid crystal dome diaphragm..
  • Accurate Hybrid Double Frequency Division: Relying on the high-precision DLP-3D printing technolo- gy, the acoustic nozzle structure with filtering function and the accurately calculated RC frequency division form a hybrid double frequency division, which makes the two dynamic driver perform respectively, offering the closer design goal of objective indicators..
  • Excellent Objective Indicators: ZERO has a proper low-frequency gain and high-frequency response in line with HRTF characteristics, which makes ZERO own the objective index comparable to that of professional monitor earphones, while it is not as cold and rigid as that of common monitor earphone, and its overall timbre is natural and full of atmosphere..
  • Glue-Dropping Molding Capping Process: ZERO whole cavity adopts a sandwich structure (front cavity, decorative panel, and glue dropping capping). ZERO is capped by glue-....
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Audiopipe APCLE-18001D Class D 1800 Watt RMS Monoblock Amp Kit Car Audio Sound System Amplifier with Bass Knob and Overload Protection, Black (2 Pack)

  • HIGH-PERFORMANCE AMP: Upgrade your audio system to this high-performance class D monoblock amplifier boasting 1,800 watts of RMS power and variable Ohm for bumping bass and full sound.
  • 4 ohms: 750 watts RMS x 1, 2 ohms: 1,100 watts RMS x 1, 1 ohm: 1,800 watts RMS x 1.
  • CUSTOMIZED SOUND: Bass-boost frequency and level adjustable for customized bass, adjustable subsonic and low-pass filter for hitting all frequencies, 1-Ohm load stability, and phase adjustability.
  • Bass boost: 0 12dB, Variable bass boost frequency: 30Hz 80Hz.
  • SAFETY FEATURES: MOSFET circuit design with overload, short-circuit, thermal, and low-voltage protection to keep your device safe and running smoothly.
  • BRIDGEABLE DESIGN: Easy bridging operation for versatile use.
  • INCLUDES: Package includes 1-channel power amp, bass knob, and mounting hardware.
  • Dimensions (L x W x H): 17 x 7 x 2.2 inches.
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