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$3.50 Shipping Condition: New Location: China The product not only can output 7.83Hz Schumann wave, but also can adjust the frequency in the range of 0.1Hz ~ 30KHz, digital circuit crystal oscillator ... morefrequency reference, more stable, stronger anti-interference.
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$2.54 Shipping Condition: Neu Location: China epatchpark Pictures Specifications Features: Receiver module parameters) Voltage: DC5V Static current: 4MA Receiver Frequency: 433MHZ Receiver sensitivity:105DB ... moreExternal antenna: 32CM single-core wire. Wound into a spiral(Transmitter module parameters) Transmission Distance:50-100 meters(voltage, the effect is different) Working voltage:3.0-12V Ways of working: AM Transfer rate: 4KB/ S Transmit power: 10mW Emission frequency: 433M External antenna: 25cm ordinary multi-core or single core line Pinout from left → right: the DATA; the VCC; GND with) Specifications: Size:Receiver module parameters)30 x 14mm(L x W) Transmitter module parameters)19 x 19mm(L x W) Package include: 1 x Wireless transmitter module 1 x Wireless Receiver module Note: A. Import duties. Taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility. B. Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying. Shipping Options All the items will be dispatched within 1 business day by Airmail after the payment is clear. Items will arrive in 7-25 business days. The arrival time depends on some factors and different areas: Country Delivery Time Working Days(not including holiday) 5-7 8-11 12-14 15-19 20-22 22 Working Days + Saturday + Sunday 5-9 10-15 16-20 21-25 26-30 31 United States Rate(item arrived) 5.1% 50.1% 29.6% 10.5% 4.7% Refund United Kingdom Rate(item arrived) 9.9% 63.2% 19.1% 3.4% 4.4% Refund Australia Rate(item arrived) 21.4% 50.0% 14.3% 7.2% 7.1% Refund France Rate(item arrived) 10.5% 28.6% 43.8% 10.1% 7.0% Refund Germany Rate(item arrived) 11.1% 22.2% 30.3% 20.9% 15.5% Refund Canada Rate(item arrived) 0.0% 47. 1% 31.4% 17.6% 3.9% Refund Spain Rate(item arrived) 3.5% 25.0% 47.9% 12.9% 10.7% Refund Please choose some local sellers. If you cannot wait patiently in the shipping time we declared. Once you purchase. Please DON'T leave negative or neutral feedback if you haven't received item in
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$3.99 Shipping Condition: New Location: China Q1: What is GNSS?. What is GNSSDO?. Use GNSS timing to adjust clocks to make clocks more accurate. Q3: Where is the GNSSDO applied?. Without antenna, ... morethe GNSSDO is used as an OCXO with keeping performance.
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$2.99 Shipping Condition: New Location: China This product is a CD4060 dream light kit, which is a DIY kit and needs to be soldered and installed by yourself. It is suitable for electronic beginners, ... moreenthusiasts, and students to use in soldering assembly training.
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Free Shipping Condition: Neu Location: China The product not only can output 7.83Hz Schumann wave, but also can adjust the frequency in the range of 0.1Hz ~ 30KHz, digital circuit crystal oscillator ... morefrequency reference, more stable, stronger anti-interference.
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Free Shipping Condition: New Location: China Module, crystal oscillator, relay and all kinds of electronic. To other remote country.
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$3.00 Shipping Condition: New Location: China High quality OCXO. - The OCXO can be used to replace your own one. - 1 x OCXO. - Perfect for enthusiasts in their audio devices.
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$3.73 Shipping Condition: Neu Location: China Frequency modulation range: 87MHZ-108MHZ;. Press the power switch, the work indicator lights up, press P-/P+ to switch the radio, after switching the ... moreradio, if there is no sound, wait for a maximum of 10 seconds before switching to the next radio, if the signal is not good, you can change the antenna direction.
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$4.50 Shipping Condition: New Location: China warmly welcome to our store.We do retail and wolesale,pls.shopping with confidence! any questons pls.contact us by ebay message. Warmly welcome to our ... morestore。 Description: TEA5767 ARDUINO radio module radio module Frequency range from 76-108MHZ automatic digital tuning. High sensitivity. High stability. Low noise. Radio module. A low-power FM stereo radio tuner electrical circuit. The internal integration of the IF frequency selection and demodulation network. Can be completely free transfer. High sensitivity( using a low-noise RF input amplifier) Frequency range from 76-108MHZ High-level radioactive AGC(AGC) circuit LC tuned oscillator with low-cost fixed chip Select in-house FM IF. IF free transfer Phase-locked loop tuning system Soft mute. Stereo noise canceling(SNC) high cut(HCC) through the bus off Frequency range from 76-108MHZ automatic digital tuning. High sensitivity. High stability. Low noise. Radio module. A low-power FM stereo radio tuner electrical circuit. The internal integration of the IF frequency selection and demodulation network. Can be completely free transfer. High sensitivity( using a low-noise RF input amplifier) Frequency range from 76-108MHZ High-level radioactive AGC(AGC) circuit LC tuned oscillator with low-cost fixed chip Select in-house FM IF. IF free transfer Power: 5V Board size: 31 X 30 MM With a power reverse protection diode Board with a power output filter inductor Multiple filter capacitor combination Blue power indicator You can directly plug the antenna port I2C bus communication Philips company dedicated chip module TEA5767 FM FM Board adopts Philips headphone amplifier chip companies as audio amplifier TDA1308 Onboard 3.5MM audio interface can be directly connected to the headphone amplifier and so on. And single-chip communications as long as the power to pick and two I2C communication lines can be. Phase-locked loop tuning system Soft mute. Stereo noise canceling(SNC) high cut(HCC) through the bus off package included: 1pcTEA5767 FM Radio Modul
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$2.59 Shipping Condition: New Location: China Output current: 5A. Full power, high stability output. Output power: 60W. Switch Upgraded Tactical Dockable Trigger Hand Grip Case for NS Switch. Due ... moreto the light and screen difference, the item's color may be slightly different from the pictures.
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$8.95 Shipping Condition: New Location: Springboro, United States Your #1 Source for Audio, Video and Speaker Building Components. We will not begin processing your order until the funds have cleared. See Auditioning ... moreYour Speakers . This does not limit the manufacturer's warranty policies on any kit component.
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$3.00 Shipping Condition: New Location: China Q1: What is GNSS?. What is GNSSDO?. Use GNSS timing to adjust clocks to make clocks more accurate. Q3: Where is the GNSSDO applied?. Without antenna, ... morethe GNSSDO is used as an OCXO with keeping performance.
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$1.50 Shipping Condition: New Location: China Module, crystal oscillator, relay and all kinds of electronic. To other remote country.
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$13.51 Shipping Condition: Brand New Location: Cairns, Australia 1 piece. Active Speaker Buzzer Module Boards - Asia Sell The "source" here does not refer to the power source. It refers to the source of the shock. The ... morecharacteristics of the passive buzzer are: (1) The passive internals do not have an oscillating source, so if the DC signal is uséd, it cannot be audible. It must be driven by a 2K-5K square wave (pwm); (2) The sound frequency can be controlled.
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$3.50 Shipping Condition: New Location: China (This board is a STM32F030F4P6 Minimum System Board(Cortex-M0). STM32F030F4P6 Mini System Board. Core: ARM® 32-bit Cortex®-M4 CPU with FPU. Accelerator™) ... moreallowing 0-wait state execution. Low-power operation.
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Free Shipping Condition: New Location: China 805 is direct-heated type thorium tungsten cathode triode, can be used as class B, A-F, and R-F power amplification, class C R-F power amplification and ... morehigh frequency oscillation. Item NO: 805. Ia (mAx.sig per tube)------------------- 210 mA.
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$6.00 Shipping Condition: Used Location: China Digital attenuator. Filter configuration (2-channel processing). Crystal oscillator circuit built-in. Input data format. PCM systems. DAT players. CD players. ... moreMolybdenum-gate CMOS.
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$4.00 Shipping Condition: New Location: China Frequency: 10mhz. - 1 x Low Phase Noise Clock Oscillator. - Phase Noise - At 25 ℃ to final frequency (1 Hour) within ±0.1ppm. Usually it cost about 35USD-50USD.
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Free Shipping Condition: New Location: United States NY PLATFORM products MAINLY INCLUDE Regulated DC Power Supply. Switching Power supply, Power Inverter, Soldering/Rework Station, SMD Hot air rework station, ... moreSMD Antistatic Lead free soldering station& Accessories, Digital Storage Oscilloscopes, Testing meters and instruments& Accessories, Power Tool Battery& Accessory etc. NY PLATFORM SUPPLIES HIGH-quality products. PROVIDES specialty technical support and DELIVERS SERVICE GUARANTEES TO ENSURE CUSTOMER SATISFACTION. WITH THESE competitive advantages, WE NOT ONLY continue to broaden product CATEGORIES to LEAD in highly competitive marketS, BUT ALSO SUCCEED to STRENGTHEN OUR PARTNERSHIPS WITH VARIOUS CHANNELS IN emerging marketS. AS ALWAYS, We strive to OFFER our customers THE BEST integrated solutionS and BEST-IN-CLASS service. DS3231 AT24C32 IIC Precision RTC Real Time Clock Memory Module For Arduino. Low-cost. Extremely accurate I2C real-time clock(RTC) with an integrated temperature-compensated crystal oscillator(TCXO) and crystal. The device incorporates a battery input. Disconnect the main power supply and maintains accurate timekeeping. Integrated oscillator improve long-term accuracy of the device and reduces the number of components of the production line. DS3231 available in commercial and industrial temperature ranges. Using a 16-pin 300mil SO package. RTC maintains seconds. Minutes, hours, day, date, month, and year information. Less than 31 days of the month, the end date will be automatically adjusted, including corrections for leap year. Clock operates in either the 24 hours or band/ AM/ PM indication of the 12-hour format. Provides two configurable alarm clock and a calendar can be set to a square wave output. Address and data are transferred serially through an I2C bidirectional bus. A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures. Provide a reset output, and if necessary, automatically switch to the backup power supply. RST pin is monitored as gener
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$2.99 Shipping Condition: New Location: China Microphone receiving distance: 1m normal speech. Microphone and audio input conversion mode: unplugged audio cable microphone works automatically. Transmitting ... morefrequency: 87-108MHz 14 frequency points, change frequency by dip switch.
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$3.90 Shipping Condition: New Location: Garland, United States Our BPW39B is 6 dB more sensitive than the BPW39A. The detector acceptance angle is ±65° WIDE at half sensitivity. The spectral range is from Green toDeep ... moreInfrared. These variables are not critical.
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$2.99 Shipping Condition: New Location: China 1 microphone for recording.
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Free Shipping Condition: New Location: Carteret, United States Including 2 pcs DIP4 socket, 7 pcs DIP8 socket, 3 pcs DIP14 socket, 3 pcs DIP16 socket, 2 pcs DIP18 socket. You should take these photos from several ... moredifferent angles, BEFORE you try to open it. Double check it to be sure.
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$2.77 Shipping Condition: Neu Location: China The screen's headers are designed to fit into the socket on the front of Esplora, but it is compatible with any AVR-based (Uno, Leonardo), Datasheet You ... morecan use this module with Esplora. About the Arduino Esplora.
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$0.99 Shipping Condition: New Location: China (the majority of smartphones and functions machine are DTMF code). 12V DC Motor. DC 12V LED lighting. Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / ... more30VDC, 10A / 28VDC, 10A / 12VDC. 1xRelay Module. Switch Upgraded Tactical Dockable Trigger Hand Grip Case for NS Switch.
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$5.00 Shipping Condition: New – Open box Location: Slovakia ■ 100-pin LQFP. ■ ARM Cortex-M3 Processor Core. • Highly flexible pin muxing allows use as GPIO or one of several peripheral functions. – Two 10-bit Analog-to-Digital ... moreConverters (ADC) with 16 analog input channels and a sample rate of one million samples/second.
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$3.73 Shipping Condition: Neu Location: China warmly welcome to our store.We do retail and wolesale,pls.shopping with confidence! any questons pls.contact us by ebay message. Warmly welcome to our ... morestore。 Description: TEA5767 ARDUINO radio module radio module Frequency range from 76-108MHZ automatic digital tuning. High sensitivity. High stability. Low noise. Radio module. A low-power FM stereo radio tuner electrical circuit. The internal integration of the IF frequency selection and demodulation network. Can be completely free transfer. High sensitivity( using a low-noise RF input amplifier) Frequency range from 76-108MHZ High-level radioactive AGC(AGC) circuit LC tuned oscillator with low-cost fixed chip Select in-house FM IF. IF free transfer Phase-locked loop tuning system Soft mute. Stereo noise canceling(SNC) high cut(HCC) through the bus off Frequency range from 76-108MHZ automatic digital tuning. High sensitivity. High stability. Low noise. Radio module. A low-power FM stereo radio tuner electrical circuit. The internal integration of the IF frequency selection and demodulation network. Can be completely free transfer. High sensitivity( using a low-noise RF input amplifier) Frequency range from 76-108MHZ High-level radioactive AGC(AGC) circuit LC tuned oscillator with low-cost fixed chip Select in-house FM IF. IF free transfer Power: 5V Board size: 31 X 30 MM With a power reverse protection diode Board with a power output filter inductor Multiple filter capacitor combination Blue power indicator You can directly plug the antenna port I2C bus communication Philips company dedicated chip module TEA5767 FM FM Board adopts Philips headphone amplifier chip companies as audio amplifier TDA1308 Onboard 3.5MM audio interface can be directly connected to the headphone amplifier and so on. And single-chip communications as long as the power to pick and two I2C communication lines can be. Phase-locked loop tuning system Soft mute. Stereo noise canceling(SNC) high cut(HCC) through the bus off package included: 1pcTEA5767 FM Radio Modul
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$1.50 Shipping Condition: New Location: China Module, crystal oscillator, relay and all kinds of electronic. To other remote country.
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$2.20 Shipping Condition: New Location: China Module, crystal oscillator, relay and all kinds of electronic. To other remote country.
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Free Shipping Condition: New Location: Lynchburg, United States The LM567 is a general purpose tone decoders designed to provide a saturated transistor switch to ground when an input signal is present within the passband. ... moreExternal components are used to independently set center frequency, bandwidth and output delay.
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$2.99 Shipping Condition: New Location: China A buzzer is a pronunciation device that can convert audio signals into sound signals. The buzzer is mainly used for prompts or alarms. Depending on the ... moredesign and purpose, it can emit various sounds such as music, siren sound, buzzer sound, alarm sound, and ringing tone.
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$15.00 Shipping Condition: New Location: China 1 x Low Phase Noise Clock Oscillator. - Phase Noise - At 25 °C to final frequency (1 Hour) within ±0.1ppm. Usually it cost about 35USD-50USD. -145dBc/Hz ... moreat 1khz.
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$2.54 Shipping Condition: Neu Location: China 433Mhz RF Wireless Transmitter + Receiver Link Kit Module for Arduino Specification: Working voltage: 3V～12V Working current: max≤40mA(12V) Min≤9mA(3V) ... moreResonance mode: sound wave resonance(SAW) Modulation mode: ASK/OOK Working frequency: 315MHz-433.92MHz. Customized frequency is available. Transmission power: 25mW(315MHz at 12V) Frequency error: +150kHz(max) Velocity: ≤10Kbps Self-owned codes: negative RX Technical Specifications: Working voltage: 5.0VDC +0.5V Working current:≤5.5mA(5.0VDC) Working principle: single chip superregeneration receiving Working method: OOK/ASK Working frequency: 315MHz-433.92MHz. Customized frequency is available. Bandwidth: 2MHz(315MHz. Having result from testing at lowing the sensitivity 3dBm) Sensitivity: excel–100dBm(50Ω) Transmitting velocity: Package Include: 1pcs 433Mhz RF Wireless Transmitter + 1pcs Receiver Dear Buyer: Welcome to my Ebay Auction. Thank you for considering our high quality proven product! We aim for Total Satisfaction with every Transaction. If you are pleased with your purchase. Please leave five star positive Feedback. Please remember to visit us next time you require high quality components. If you are not 100% satisfied. Please don't leave a neutral or negative feedback but contact us First, so we can resolve your issues immediately. Our promise is“We will resolve the matter for you” Elec_mall Payment: We accept PayPal only. Payment must be received within 7 business days before auction closing. Shipping& Handling 1.Items are shipped from china.we will send out within 1 working days after receive the money. 2.We usually send the parcel by HongKong Post Air Mail. most country will arrived the parcel in 12-25 business days. We also can provide Express.Such as Fedex,DHL,EMS,usually 3-7days to most country.If you need Expedited shipping,contact us. The global shipping is difficult to control sometimes.If you havent receive after 25days,contact us,we will check for you. 3.We send to the address of ebay add info.Please check your add info of ebay i
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$4.39 Shipping Condition: New Location: Costa Mesa, United States Replaces: NTE846, LM1889. ECG846, Color TV Video Modulator IC. It consists of a sound subcarrier oscillator, chroma subcarrier oscillator, quatrature ... morechroma modulators, and RF oscillators and modulators for two low-VHF channels.
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$2.95 Shipping Condition: New Location: China Microphone receiving distance: 1m normal speech. Microphone and audio input conversion mode: unplugged audio cable microphone works automatically. Transmitting ... morefrequency: 87-108MHz 14 frequency points, change frequency by dip switch.
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Free Shipping Condition: New Location: Suffern, United States Without Oscillating Source: The passive buzzer module does not have an internal oscillation source, so if a DC signal is used, it cannot be made to whistle. ... moreFeature: 1. Easy to Install: The passive buzzer module is specially designed with holes for fixing with (not included), convenient to install.
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Free Shipping Condition: New Location: Arlington, United States Piezo Audio Indicator Constant Tone Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 Oscillating Frequency(Hz) 2900+/500Hz Operating ... moreVoltage: 6 to 28vdc Sound Pressure Level at 30cm/12vdc 85db(min. Tone: Continuous Operating Temperature: 20 to +60 Size: 43mm diameter at base, 27.5mm diameter at threaded portion Height: 20mm + 12.5mm for threaded portion. Total height 32.5mm For panel mounting. Fits 1.125” diameter opening, up to.25” thick Package of 1 pieces
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$3.73 Shipping Condition: Neu Location: China This product can not only output 7.83Hz Schumann wave, but also join the programmable FM technology, can adjust the frequency in the range of 0.1Hz~30KHz;. ... moreThe product not only can output 7.83Hz Schumann wave, but also can adjust the frequency in the range of 0.1Hz ~ 30KHz, digital circuit crystal oscillator frequency reference, more stable, stronger anti-interference.
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$3.19 Shipping Condition: Neu Location: China The product can not only output 7.83Hz Schumann wave, but also can be adjusted in the range of 0.1Hz ~ 30KHz frequency, digital circuit crystal oscillator ... morefrequency reference, more stable, stronger anti-interference.
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$3.90 Shipping Condition: New Location: China Module, crystal oscillator, relay and all kinds of electronic. To other remote country.
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$3.90 Shipping Condition: New Location: China ELNA is an old and well-known electrolytic capacitor manufacturer in Japan for more than 60 years. Series Silmic RFS Series. Among them, Cerafine and ... moreDuorex show a transparent tone; For Audio sweet tone; STARGET musical flavor; Longlife and Silmic performance fast and powerful, suitable for the performance of modern music.
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$4.00 Shipping Condition: New Location: China High quality OCXO. - The OCXO can be used to replace your own one. - 1 x OCXO. - Perfect for enthusiasts in their audio devices.
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Free Shipping Condition: New Location: Sri Lanka Diy electronic kit NE555 Circuit diacritic siren Donkey Sound effect circuit kit diy soldering teaching Project. The tone-changing siren consists of two ... moreintegrated circuits NE555, the oscillation frequency of U1 is about 1 second, and the oscillation signal is composed of U1.
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Free Shipping Condition: New Location: China Specification:Descriptions:2 Terminals,complete drive circuit incorporated for direct operation from DC power source.They have good characters like small ... morecubage, low wastage and high voice pressure.Please note a passive buzzer needs an external oscillation circuit to operate.
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$3.00 Shipping Condition: New Location: China This is a 0~55MHz DDS Signal Generator. It is based on AD9850 chip and is very easy to operate. Supports 0~55MHz continual adjust at 1Hz step. A: ENABLE ... more6XREFCLE: setting chip clock mode, adjust frequency encoding setting.
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Free Shipping Condition: New Location: China
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Free Shipping Condition: New Location: Aurora, United States PhotoCoupler: PC817 Multivibrator: CD4047 Analog Multiplexer: CD4053 Echo Audio Processor: PT2399. IC Plier included for easy picking and removing IC.
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$3.00 Shipping Condition: New Location: China With isolated power layer, signal layer and GND layer, its 4-layer PCB board ensures high SNR. All I2S signals, SPI signals, I2C signals, SPDIF TX/RX ... moreports, AUX ADCs are reserved by double-row pins on both sides (2 15, 2.54mm pitch).
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$1.00 Shipping Condition: New Location: China Module, crystal oscillator, relay and all kinds of electronic. To other remote country.
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$3.00 Shipping Condition: New Location: China Frequency stability: 5e-12. Equipped with SMA outer screw inner hole interface. 1 Frequency Reference Source. Interface type: SMA outer screw inner hole. ... moreItem weight: 40g / 1.41ounce. We will try our best to avoid any quality problem.
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$2.98 Shipping Condition: New Location: China Microphone receiving distance: 1m normal speech. Microphone and audio input conversion mode: unplugged audio cable microphone works automatically. Transmitting ... morefrequency: 87-108MHz 14 frequency points, change frequency by dip switch.
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$3.00 Shipping Condition: New Location: China High-end audio decoders, digital turntables and other audio devices with external 10MHz clock input. - ALM: Status indicator. - 4-channel 10MHz outputs, ... moreincluding 2-channel square waves and 2-channel sine waves.
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$7.31 Shipping Condition: New Location: Taiwan ☆☆☆☆☆More Item ☆☆☆☆☆. For high frequency applications e.g. ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ... more☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆.
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$2.77 Shipping Condition: Neu Location: China Transmitting frequency: 87-108MHz 14 frequency points, change frequency by dip switch. Microphone and audio input conversion mode: unplugged audio cable ... moremicrophone works automatically. Microphone: Yes, PCB on board.
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$2.99 Shipping Condition: New Location: China 1: Enhance learning ability 2: Increase DIY interest 3: Charging input voltage: 4.5V-5.5V DC 4: Simple production, high installation success rate 5: supporting ... morea variety of electronic components Ships without battery Charging input voltage: 4.5V-5.5V DC; Frequency modulation range: 87MHZ-108MHZ; Board size: 7.6CMX4.2CM; Shell size: 13.2cm*8.3CM*2.6CM Package battery capacity: 1000MAH; Headphone output interface: 3.5 dual channel Package speaker: 8 Euro 5W. Usage and function introduction: Press the power switch, the work indicator lights up, press P-/P+ to switch the radio, after switching the radio, if there is no sound, wait for a maximum of 10 seconds before switching to the next radio, if the signal is not good, you can change the antenna direction.
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$2.82 Shipping Condition: New Location: China
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$1.80 Shipping Condition: New Location: China 1x VS1053 MP3 Module. The recording encoding format is IMA ADPCM(mono channel) One line_in input interface, supporting two input modes. Due to the light ... moreand screen difference, the item's color may be slightly different from the pictures.
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$5.00 Shipping Condition: New Location: China Q1: What is GNSS?. What is GNSSDO?. Use GNSS timing to adjust clocks to make clocks more accurate. Q3: Where is the GNSSDO applied?. Without antenna, ... morethe GNSSDO is used as an OCXO with keeping performance.
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$3.54 Shipping Condition: Brand New Location: China Specification:Descriptions:ABS housing, DC 1-30V working voltage, black and red 2 wire, convenient for wiring.Please note a passive buzzer needs an external ... moreoscillation circuit to operate.
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$16.73 Shipping Condition: Brand New Location: Birrong, Australia 1 piece. Active Speaker Buzzer Module Boards - Asia Sell The "source" here does not refer to the power source. It refers to the source of the shock. The ... morecharacteristics of the passive buzzer are: (1) The passive internals do not have an oscillating source, so if the DC signal is uséd, it cannot be audible. It must be driven by a 2K-5K square wave (pwm); (2) The sound frequency can be controlled.
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