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2. Comparison of single-board microcontrollers - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_single-board...

   The board can also run from a standard power supply and use the battery as backup. Additionally it can be upgraded to include a RTC chip or a high-voltage LDO. On field tests the Whisper Node was able to communicate on distances over 1 km line-of-sight and can run for years on battery, making a great platform for remote sensing and IoT ...

3. List of Arduino boards and compatible systems - Wikipedia

   en.wikipedia.org/wiki/List_of_Arduino_boards_and...

   It has 34 I/O pins; 64 KB RAM; 256 KB of flash; 2x16-bit ADC; 12-bit DAC; 3xUARTs, SPI, 2xI²C, I²S, CAN bus, Touch and other I/O capability. All digital pins are 5 volt tolerant. Teensy 3.2 adds a more powerful 3.3 volt regulator, with the ability to directly power ESP8266 Wi-Fi, WIZ820io Ethernet and other power-hungry 3.3 V add-on boards.

4. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   Many systems used in telecommunications use an extra-low voltage "common battery" 48 V DC power, because it has less restrictive safety regulations, such as being installed in conduit and junction boxes. DC has typically been the dominant power source for telecommunications, and AC has typically been the dominant source for computers and servers.

5. LED circuit - Wikipedia

   en.wikipedia.org/wiki/LED_circuit

   Its development was led by Howard C. Borden and Gerald P. Pighini at HP Associates and HP Labs, who had engaged in research and development (R&D) on practical LEDs between 1962 and 1968. [5] It was the first intelligent LED display, making it a revolution in digital display technology, replacing the Nixie tube and becoming the basis for later ...

6. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   Some versions have a tap at 22.5 volts. GB Battery: C Battery Eveready 761: 1.5 to 9 V: Threa­ded posts or banana sockets H: 76.2 L: 101.6 W: 31.75 Originally used in vintage vacuum tube equipment for grid bias. Still popular for school science class use as a variable voltage supply as the current version has several taps at 1.5 volt intervals ...

7. Teacher Who Got Pregnant After Raping Boy, 12, Gets 25 ... - AOL

   www.aol.com/lifestyle/teacher-got-pregnant...

   A former Tennessee teacher who got pregnant after raping a 12-year-old boy pleaded guilty and has been sentenced to 25 years in prison with no parole. On Dec. 20, Alissa McCommon, 39, of Covington ...