ReviewsVoltage Controlled Crystal Oscillator

DAOKI 5Pcs RTC I2C Module Arduino I2C RTC DS1307 AT24C32 Real Time Clock Module 24C32 Memory High Precision for AVR ARM PIC SMD Compatible with Arduino with 60 Pin

Clock chip: high-precision clock chip DS3231SN.
is a 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..
The DS3231 is available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package..

Please NOTE: Open the Arduino IDE, you’ll need to click the “Tools”, then select the Board that corresponds to your Arduino. If you don't choose the correct development board type, it will cause the compilation to fail to transfer. So this is a place that needs special attention..
The keyestudio Leonardo is a microcontroller board based on the ATmega32u4，It has 20 digital input/output pins (of which 7 can be used as PWM outputs), 12 analog inputs, a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button..
The Leonardo differs from other boards using separate USB-Serial chip in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor..
This allows the Leonardo to appear to a connected computer as a mouse and keyboard..
Has fcc and ce certification that they are made from environmentally friendly production technology and materials, made function,voltage, current testing before packaging.

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 ....

3 Colors Temperatures:Crystal ceiling light flush mount chandeliers,.Multicolor can change three color,Cool White (4500-6000K).
Natural light (3500K-4500K),Controlled by normal switch..
Led Pendant Light: Crystal pendant lighting Length 340mm (13.4")* Height 210mm(8.3"), Ceiling size: 200mm(7.9") ,Max 29W, Voltage=85-265v, Bulb Type: LED Chips..
Crystal Chandeliers Materials : Crystal & Acrylic & Stainless Steel.
Suggested Room: Living room,bedroom, dining room, foyer, farmhouse, bar, restaurants, galleries, hotel, coffee shop, office, etc..
Warm Reminder:Please remove the film before installing the crystal chandelier..

S-Pixie Kit is a small and exquisite shortwave radio station, working mode is CW. Transmitting local oscillator frequency: 7023KHz.
receiving local oscillator frequency: about 7023-7026KHz..
Radio Station Power Supply Voltage is 9-13.8V (Battery or Linear Regulated Power Supply is Recommended), and the positive and Negative Poles are Not distinguished. Antenna: 50 ohm, 7MHz, standing wave ratio below 2.0..
Radio station receiving static current: 20mA, transmitting current: 120mA , Transmitting power: 1.2W, does not support automatic transmission, key: manual key.
Before powering on the radio station, please connect a dummy load to prevent accidental emission from burning..
After you purchase, I will send you the product manual through the platform chat window. After getting the product, please tear off the protective film on the product protective case. You will get exactly the same product as the main picture. We will provide you with quality service. Please feel free to contact me if there are any problems during the use of the product..

Product Type: Crystal Oscillator Frequency Counter.
Crystal Test Range: about 4MHz-48MHz(not include 32.768KHZ).
PCB Size: 80*53*2mm. Net weight : about 39g.
Package Include: 1 set Frequency Counter Tester Parts( Attention: the products are in parts , the buyers need to assemble them).