Nixie-clock-main-board

Main PCB of my Nixie clock

Board overview

• 12V AC input
• Rectified, smoothed 12V AC output (around 16V DC, powering the 180V power supply)
• ATmega32 AVR microcontroller as the heart of the Nixie clock
• Photoresistor input for PWM Nixie tubes dimming
• Two inputs for external buttons used for timezone setting (UTC offset): TIMEZONE- and TIMEZONE+
• GPS module connector (3.3V, ground and GPS_TX line) with power on/off capability
• 6P6C connector used for interfacing the Nixie clock tubes driver board
• AVR ISP connector for AVR programming

Images

External 3D models used in the PCB render

• Bridge rectifier
• Toroid inductor
• 6P6C connector