Top Frequency Counter Circuit Design Reviews

DORHEA 3 Set Electronic Flashing Lights Soldering Practice Board LED NE555 CD4017 IC LED Electronic Lights Kits Red Blue Dual-Color DIY Kit Strobe Electronic Suit Flashing Lights Components DIY

The circuit working voltage: DC9-12V. The product does not include battery. It is simple to make, has obvious effect and is interesting. The circuit can be used for electronic toys, art lighting, LED billboards ,ect..
This suite adopts simulation light circuit made with NE555 and CD4017, the blue LED and red LED flashed alternately according to the pulse. The multivibrator composed of NE555 will have a certain frequency of oscillation signal send to CD4017 decimal counter/pulse distributor, in order to count..
This is a very interesting circuit for simulating the visual effects of warning lights, blue and red lights flash alternately according to the pulse respectively. This kit is simple to assemble, suitable for electronics enthusiasts and students to practice. Design optimized for training, it adopts 1.6mm electric board and nice layout of the components..
Specially designed for the training, cost-effective, red diodes and blue diodes can be opened with wire connections to expand the lamp distance, the original board number and model on the circuit board, the right seat can be installed..

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KZ EDX PRO 1DD 10mm Dual Magnetic Dynamic Driver HiFi in-Ear Monitors KZ Earphones KZ IEMs with Detachable 0.75mm C Pin Cable (No Mic, Cyan)

【Upgraded Version KZ EDX PRO Earphones】Upgrade version of KZ EDX earphone, Using a special dual magnetic circuit sound unit, the size reaches 10mm. Dual magnetic circuit dynamic unit brings a more natural low frequency response and transparency high frequency performance ..
【Special 10MM Dual Magnetic Circuit Dynamic Unit】The upgrade version of kz edx in ear earphones use a special 10mm dual magnetic circuit sound unit, bringing a more natural low frequency response and transparency high frequency performance .The advantage of the dual magnetic circuit dynamic is in the strong and abundant magnetic ,which provides shocking low-frequency sound effects, and the gentle and sweet vocals, as if being in a concert scene..
【Three Frequencies Equalization, Smooth To The End 】The electronic crossover board is integrated into the dynamic unit through sophisticated technology to enhance the performance of the low-mid frequency dynamic range. whether it is EMD Rock R&B or Classical Violin , it can play a strong role ..
【Ergonomic Design &Comfortable Wearing】The same ergonomic cavity structure as always, the ligh....

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FC-3000P Ham Radio CB Frequency Counter 27Mhz-3000Mhz - High Sensitivity with CTCCSS DCS Decoder for The VHF & UHF - CB Continuous Carrier Signal, Walkie-Talkies, DMR Radio Transceivers

✔️ IDENTIFYING FREQUENCY - The frequency meter measures frequency parameters of the continuous carrier signal walkie-talkies , with signal strength indicator..
✔️ PORTABLE FREQUENCY COUNTER - Counting continuous wave signal comes from Two-way Radio. VHF & UHF frequency measurement, useful for the CB amateur Ham Radio..
✔️ FREQUENCY COUNTER METER RANGE - CB, HAm Radio, DMR frequency range 100Mhz-3000Mhz. Build-in DCS CTCSS Decoder Low PPM crystal time base used to achieve high accuracy measurement.
✔️ EASY TO OPERATE - User friendly controlled with four buttons. The DMR radio frequency counter is compact and handy when needed..
✔️ 100% MONEY BACK GUARANTEE 2 YEARS WARRANTY ensures this will quickly become your favorite no-risk purchase..

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IEM1200 Wireless in Ear Monitor System 2 Channel 2/4/5 Bodypack Monitoring with in Earphone Wireless Type Used for Stage or Studio (5 Bodypacks)

UHF WIRELESS IN EAR MONITOR SYSTEM-UHF band Phase lock PLL,Improved comprehensive performance, anti-frequency drop, anti-series frequency. Frequency range: 550 MHz-580 Mhz. In the 32MHz frequency band, the preset 40 frequencies can be switched at will. The dynamic expansion circuit greatly improves the signal-to-noise ratio.
USED IN STAGE PERFORMANCE AND SOUND BROADCASE-Built-in Limiter circuitry eliminating distortion under excessive input levels. Front panel 1/4-inch stereo monitoring has the headphone jack.Used in stage，it can replace traditional comples sound monitoring equipment,achieve admirable listening effect.
DESIGN FEATURES(APPERANCE AND DISPLAY)-Elegant liquid crystal display panel and LCD display low-battery indicator on the receiver.With power and RF receiving indecator lamp. It using two AA batteries and efficient power circuit,longservice time.The metall housing makes it sturdy and durable.
WIRELESS RANG AND FREQUENCY RANG-IEM1200 in ear monitor and receiver system offers tabletop stage monitoring with a wireless range of up to 300 feet,THE normal can be 250FT-350F.Also improve the signal-to-noise ratio of the dynamic range so that the system has the best anti-interference to show the perfect original sound again.

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IEM1200 Wireless in Ear Monitor System 2 Channel 2/4 Bodypacks Monitoring with in Earphone Wireless Type Used for Stage ，Studio and Church (2 Bodypacks)

UHF WIRELESS IN EAR MONITOR SYSTEM-UHF band Phase lock PLL,Improved comprehensive performance, anti-frequency drop, anti-series frequency. Frequency range: 550 MHz-580 Mhz. In the 32MHz frequency band, the preset 40 frequencies can be switched at will. The dynamic expansion circuit greatly improves the signal-to-noise ratio.
USED IN STAGE PERFORMANCE AND SOUND BROADCASE-Built-in Limiter circuitry eliminating distortion under excessive input levels. Front panel 1/4-inch stereo monitoring has the headphone jack.Used in stage，it can replace traditional comples sound monitoring equipment,achieve admirable listening effect.
DESIGN FEATURES(APPERANCE AND DISPLAY)-XTUGA in ear monitor system with elegant liquid crystal display panel and LCD display low-battery indicator on the receiver.With power and RF receiving indecator lamp. It using two AA batteries and efficient power circuit,longservice time.The metall housing makes it sturdy and durable..
WIRELESS RANG AND FREQUENCY RANG-IEM1200 in ear monitor wireless and receiver system offers tabletop stage monitoring with a wireless range of up to 300 feet,THE normal can be 250FT-350F.Also improve the signal-to-noise ratio of the dynamic range so that the system has the best anti-interference to show the perfect ....

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Discover It - iProtect 3 Band RF Anti-Spy Counter Surveillance Radio Frequency Bug Detector - Detect Listening Devices, Hidden Cameras, GPS, WiFi, Bluetooth, GSM, 3G, 4G/LTE, 2.4, and 5.8Ghz Signals

"THE DISCOVER IT - iPROTECT DD1216 - 3 BAND RF ANTI-SPY COUNTER SURVEILLANCE RADIO FREQUENCY BUG DETECTOR HAS GIVEN ME PIECE OF MIND!" - Did you know that countless families, businessmen & women and corporations have relied upon the Discover It - iProtect 3 Band RF Anti-Spy Counter Surveillance Radio Frequency Bug Detector to ensure their MAXIMUM level of privacy and security? Get ready to experience your greatest level of personal privacy yet!.
THREE BANDS OF DETECTION - Did you know that the detection frequency range of the Discover It - iProtect 3 Band RF Anti-Spy Counter Surveillance Detector has been split into 3 parts, each displayed by a separate bargraph: "VHF/UHF 50-700 MHz", "Mobile and wireless 700 MHz – 3 GHz" and "Microwave and wireless 3-12 GHz". Allowing the operator to understand what type of signal is detected, to detect several signals simultaneously and to sustain the ability of detection near sources of interference.
HAVE AMAZING PROFESSIONAL 5 STAR RESULTS WITHOUT QUESTIONING THE DETECTION RESULTS - Do you want to have amazing 5 STAR detection results each and every time you scan your home, car, office & conference board room or hotel room? Its never been easier to sweep and detect hidden bugs, hidden cameras or malicious RF sign....

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Water Flowing Light Module, 2 Pcs Light Module Electronic Light Kit LED Chaser DIY Kit LED Running Light for Electronic Circuit

Mainly composed of clock generation circuit and decimal counter circuit..
The self-excited multivibrator with NE555 as the core, the power supply charges capacitor C1 through R2, R3, R4. When C1 starts charging, the 2 pin of NE555 is still at low level, so the output pin 3 is high level. When the power supply is charged to the.
The charging time is: 0.695 (R2+R3+R4)C1, the discharge time is: 0.695 (R4+R3)C1, the R4 can be adjusted to control the output frequency of the oscillator, and the clock oscillation signal of NE555 is continuously added to the 14th pin of CD4017..
Ten LEDs are connected to the 10 outputs of the CD4017. When the 10 outputs of the CD4017 alternately generate a high level under the action of the clock signal, D1--D10 are sequentially illuminated to form a water-light effect..
Adjust the R4 to adjust the flow speed of the LED light..

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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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