ReviewsHigh frequency Board

CW QRP Shortwave Radio Kit - CW Transceiver Shortwave Radio Kit

  • The patch device of the main control board has been pre welded and connected to the base plate in the form of stamp hole. The single chip microcomputer adopts pic16f1938, builtin PLL local oscillator, supports crystal oscillator calibration setting, and has its own frequency indication circuit (Seven Segment LED nixie tube is used, the display unit is 1kHz, the photo has color difference, and the actual color is red. The working frequency covers 7.000-7.100mhz, 1kHz or 100Hz steps )..
  • Ta2003 mixer is used for reception, and crystal filter is used for if. After ta2003 multiplication detection, the sound size is adjusted by digital potentiometer and sent to audio active filter circuit. Finally, LM386 drives speaker, and if frequency supports calibration setting..
  • Use 3 bs170 parallel outputs, class E amplification, 12V power supply, output power 5W! Relay switching is used for transceiver, with the function of transmitting delay adjustment to avoid frequent relay switching and improve the isolation of transceiver channel..
  • It has the function of automatically sending call signs, which is very convenient to use. The MCU uses the original code of our store, which can adjust the code speed, sidetone frequency and sidetone size. It can input the call sign by ....
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Rockville APM10C 10\ 400 Watt Powered/Active Studio Subwoofer Pro Reference Sub, Classic Wood, 10 inch

  • ...or on Rear Panel. Rubber woofer surrounds increases sound quality and eliminates unwanted distortions..
  • We developed the Most Optimized Magnet structure, Cone, and Cabinet Space that Reproduces the Sound to Play Back Exactly the Way it was Recorded! Specially Wound Voice Coils Produce Accurate Response along the Low Frequency Spectrum..
  • Thick "Wadding" protects inside the subwoofer cabinet - Wadding is a white, artificial silk-like material that we put inside the subwoofer cabinet for multiple reasons..
  • Every subwoofer in Production Undergoes a Computer Generated Sound Check Test to Ensure it Upholds to our Specifications and Standards. We use a "6Sigma" style Quality Assurance of Each Product.
  • Inputs / Outputs / Controls: Volume control. Crossover Frequency Control allows you to adjust low frequency input: 50Hz - 150Hz. 1/4" TRS input jack. Left and Right XLR input/outputs. RCA input/outputs..
  • Details: Certification: CE and RoHS Compliant. Amplifier: Class D, very efficient amplifier with top components! (ST--STA309, ST--STA516, SMPS).Woofer Impedance: 8 Ohm. Signal to noise ratio: 98 dB (Maximum output with THD+1003c1%, A-weight).THD: 0.8%..
  • Frequency Response: 34Hz - 150 KHz. 400 Watts peak output. 200 Watt RMS output.Input voltage: 120V. 10" woofer wit....
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BUBOS Acoustic Absorption Panel,12

  • ..., home theaters theaters etc ,which allows you to leave countless beautiful memories in a comfortable environment..
  • GOOD NOISE REDUCTION : If you are mixing in the studio, the ambient sound must be reduced. Any unnecessary noise will destroy the recording. The sound-absorbing board absorbs the sound generated by low frequency, middle frequency and high frequency, making it very suitable for recording..
  • EASY TO INSTALL:They can be used as acoustic cover for walls, ceilings and doors, just easily attach it with ,glue or 3M adhesive taps.Easy to shape and cut to size, altering wont affect performance,no special tools or materials are needed for installation..
  • AFTER SELL:If you are not satisfied with our products, please do not give us a 1 star review, our professional acoustic engineers will analyze the specific situation for you If it cannot be resolved, we will provide a 100% refund, no problem. Click Add to cart above to get it now!.
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MMDVM Duplex Hotspot Module Dual Hat V1.3 Support P25 DMR YSF NXDN DMR Slot 1 + Slot 2 for Raspberry pi with USB Port (Without OLED)

  • if the board fails to work on duplex mode, please run the upgrade command: sudo pistar-mmdvmhshatflash hs_dual_hat.
  • HIGH PERFORMACE: 32-bit ARM processor, up to 10mW RF power, fully tested every piece..
  • WIDELY COMPATIBLE: Supports DMR, P-25, D-Star and System Fusion.
  • WORK with RASBERRY Pi: Mounts cleanly on current Raspberry Pi including the Pi Zero , NOT compatible with Rasberry Pi 4..
  • Update new FW: (pi-star / expert / ssh access / user :pi-star pass:raspberry) then run sudo pistar-mmdvmhshatflash hs_dual_hat set Jumper BOOT0=1,BOOT1=0 and soler JP1 First! After upgraded finished, disconnect JP1.
  • FREQUENCY: Radio Frequency : Freq:144-148,219-225, (Main Band) 420-475,842-950 NOTE: TX =0, RX=0. Modem select: STM32-DVM/MMDVM_HS-Raspberry pi Hat(GPIO) or any other (GPIO board).
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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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Kinboofi KZ ZS10 Pro IEM in Ear Monitor, 4BA 1DD KZ Headphone Multi Driver in Ear Earphone IEM, KZ Earphone, on Stage Monitor for Singer Guitarist Drummer (Matte Black No Mic)…

  • 5 Drivers KZ ZS10 Pro Upgrade Version of ZS10: The KZ ZS10 Pro has 4 balanced armature drivers and 1 piece Second Generation 10mm double magnetic dynamic driver, the bass range has improved much compared with former ZS10 model. Mid range 50060 balanced armature and 30095 high frequency armature driver bring much brighter definition on music..
  • Upgrade Detachable 2Pin Cable Design of KZ ZS10 Pro: Newest protective 2 pin design on this KZ earphone, effectively protect the insertion pin from breaking and prolong the using time. 0.75mm 6N OFC cable with gold plated standard 3.5mm jack design, provides better sound quality signal transmission..
  • Separate PCB Frequency Crossover Board: Separate electric frequency crossover board and acoustic structure on this KZ ZS10 Pro headphone, let the sound of this earphone become clearer and smooth, fully showed the advantage of each driver..
  • Durable 304 Stainless Steel Penal: KZ ZS10 pro monitor headphone uses the 304 stainless steel shell and resin as the major structure material, provide this KZ IEM more durability feature and fashionable appearance. All In One Button - No Volume Control: ....
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AURSINC MMDVM Hotspot Board + Antenna Support UHF VHF Support P25 DMR YSF DSTAR NXDN POCSAG for Raspberry Pi-Zero W, Pi 3 (OLED Board)

  • MMDVM hotspot supports UHF VHF, frequency range: 144MHz-148MHz, 420MHz-475MHz, 842MHz-950MHz (depending on ADF7021 and TCXO, HAT firmware amateur radio brand license restrictions).
  • AURSINC hotspot board supports Raspberry Pi 3B, 3B +, Pi ZERO, compatible with NanoPi NEO, Orange Pi, compatible with BlueDV (requires USBtoTTL or Bluetooth model).
  • Hotspot board saves electricity, High quality TCXO, stable, low BER. Support MMDVM mode DMR / YSF / P25 / NXDN / DSTAR / POCSAG. Support online upgrade, User-friendly OLED and Nextion special design location, reserved for additional installation of Bluetooth modules.
  • If the Raspberry fails to connect the hotspot board, please try update the firmware of the hotspot board by conducting the command: sudo pistar-mmdvmhshatflash hs_hat-12mhz.
  • Compatible with P4 settings:since our mmdvm board is defautly setup for Pi-Zero W, Pi 3. and if you do want to connect it with your Pi 4, you could try below methods. PICK ONE. Method 1: Remove the R1 resistance of the hotspot board(single/dual).
  • Method 2: Cut off the 2 Raspberry Pi pin headers on the corners of the board ( pick one to operate on your MMDVM board, refer to the product image for the R1 and 2 pin headers locations).
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KZ Headphone 4BA+1DD Multi Driver in Ear Earphone IEM ZS10 Pro Wired Comfortable Noise Cancelling Wrap Around Ear Headphones with 2 Pin Detachable Cable(Meteor Blue,with Mic)

  • ...ded version of KZ ZS10 earphones,The KZ ZS10 Pro Equiped with 4 balanced armature drivers and 1 piece Second Generation 10mm double magnetic dynamic driver, the bass range has improved much compared with former ZS10 model. the pro features self-customized balanced armatures which includes two 30095 drivers for high frequency, two 50060 drivers for mid frequency. With this configuration, the sound is transient, dynamic and bright in all respects..
  • 【Separate PCB Frequency Dividing Board】KZ zs10 pro IEMs wired earbuds Come with Separate electric frequency crossover board and ingenious acoustic structure to give full play of all the drivers, displaying a smooth, sensible, detailed music experience..
  • 【Stylish Appearance & Exquisite Craftsmanship】The zs10 pro's faceplate is made of 304 stainless steel while the cavity is made from imported resin. The two different material not only presents an elegant look and shimmer but also be practical and durable..
  • 【Upgrade 2Pin Detachable Cable Design & Universal 3.5mm Audio Jack Plug In】Newest protective 2 pin design on this KZ earphone wired earbuds ，detachable ....
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RockvilIe APM6C 6.5' 2-Way 350W Active/Powered USB Studio Monitor Speakers Pair

  • Rockville APM5W 5.25" 2-Way 250 Watt Powered USB Studio Monitor Speakers in White ( Pair). 125 Watt RMS. Two-Way Active Studio Monitor Speaker System. Quad Amp Design: Each Driver Features Frequency Specific Independent Amplifiers..
  • The enclosure is 0.5" thick while the front board of it is a full 1" thickness to give you the ultimate best sound quality! Comes in 3 enclosure finish options Wood finish painted black. Wood finish painted white. Wood finish with vinyl front board.
  • Full Range Class "D" Amplifier Circuitry with Auto-Switching Power Supply. LED Power on Indicator on Rear Panel. Ferro Fluid Enhanced 3/4" Neodymium Silk Dome Tweeter With Metal Grill Protection. Tweeter has 3/4" voice coil diameter.
  • 110 Volt compatible with SMPS technology. Every Speaker in Production Undergoes a Computer Generated Sound Check Test to Ensure it Upholds to our Specifications and Standards. We use a "6Sigma" style Quality Assurance of Each Product.
  • Transducer Production Line to Make the SPL Performance Stable. One Complete Pair with Mater / Salve Output Connection with Included Noise Rejection Cabling.
  • Inputs / Outputs / Controls: Volume control. Bass/Treble Control -4dB to 4dB (allows you to adjust high and low frequency independently). 1/4" and XLR combo input jac....
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Rockville Rock Shaker 10\ Inch Black 600w Powered Home Theater Subwoofer Sub

  • ...istortion-Free Playback Even at Max Volume Listening! Very Clean Sound!, Enclosure is filled with fire resistant poly cotton, Detachable foam grill.
  • Inputs / Outputs / Controls: RCA line input, RCA line output, Speaker High level inputs, Speaker High level outputs, Volume control, Phase switch (0°-180°), Crossover Frequency control, Power switch, Standard IEC power cable included.
  • Specifications: Amplifier: Class D, Woofer Impedance: 4 Ohm, Signal to noise ratio: 85 dB (Maximum output with THD+1003c1%, A-weight), THD: 1%, INPUT sensitivity: 88dB +/- 2dB, Frequency Response: 20 Hz - 200 Hz, 600 Watts peak output, 300 Watts RMS output, Voltage: 110-240V, Product Dimensions in Inches: (W*H*D): 12.6'' x 15.5'' x 16.5'', Shipping Dimensions in Inches: (W*H*D): 15.7" x 19.7'' x 18.5'', Unit Weight: 20 LBS, Shipping Weight: 24.5 LBS, Color: Black.
  • Rear side of the subwoofer: Subwoofer (LINE) Jack in, Subwoofer (LINE) Jack out, Volume Control, Phase switch (0° - 180°), Frequency control, Power switch, Speaker high level in, Speaker high level out??.
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Rockville APM5B 5.25' 2-Way 250W Active/Powered USB Studio Monitor Speakers Pair

  • Rockville APM5B 5.25" 2-Way 250 Watt Powered USB Studio Monitor Speakers in Black (Pair). 125 Watt RMS. Two-Way Active Studio Monitor Speaker System. Quad Amp Design: Each Driver Features Frequency Specific Independent Amplifiers..
  • The enclosure is 0.5" thick while the front board of it is a full 1" thickness to give you the ultimate best sound quality! Comes in 3 enclosure finish options Wood finish painted black. Wood finish painted white. Wood finish with vinyl front board.
  • Full Range Class "D" Amplifier Circuitry with Auto-Switching Power Supply. LED Power on Indicator on Rear Panel. Ferro Fluid Enhanced 3/4" Neodymium Silk Dome Tweeter With Metal Grill Protection. Tweeter has 3/4" voice coil diameter.
  • 110 Volt compatible with SMPS technology. Every Speaker in Production Undergoes a Computer Generated Sound Check Test to Ensure it Upholds to our Specifications and Standards. We use a "6Sigma" style Quality Assurance of Each Product.
  • Transducer Production Line to Make the SPL Performance Stable. One Complete Pair with Mater / Salve Output Connection with Included Noise Rejection Cabling.
  • Inputs / Outputs / Controls: Volume control. Bass/Treble Control -4dB to 4dB (allows you to adjust high and low frequency independently). 1/4" and XLR combo input ja....
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