====== Nixie Clock ======

{{:nixieclock-1.jpg?380|Nixie Clock}}

===== Introduction =====

I designed and built this basic 4 tube nixie clock in my senior year of high school.  

For more a detailed introduction, please read the [[history]] page.

===== Detailed Information =====

  * [[History]]
  * [[Power supply]]

===== Specifications =====

  * Display
    * 4x ИН-16 (IN-16) Nixie tubes
    * 208V anode bias
    * 1x К155ИД1 (K155ID1) high voltage BCD to decimal decoder/nixie tube driver (74141 equivalent)
  * Processor
    * Microchip PIC18F2550-I/SO
    * 20 MHz clock, 5 MIPS
    * 32K Flash
    * 2K RAM
    * 10x 10-bit ADC
    * I²C, SPI, and EUSART peripherals
  * Clock
    * Maxim/Dallas DS1340C
    * I²C Interface
    * Built-in crystal
    * Backup battery support
  * Power Supply
    * Input: 12V DC
    * Output: 5V DC
    * 7805 regulator
  * High Voltage Power Supply
    * Input: 12V DC
    * Output: 12V - 300V DC variable
    * Boost topology
    * IRF720 400V 3.3A N-channel MOSFET
    * HER105 400V 1A fast recovery rectifier
    * 4.7µH Inductor