IV-11 KR145iK1911 VFD clock

thingiverse

The clock runs on a microcontroller made in the USSR. The controllers and VFD are still available on some places. Still available even outside of Russia, that has been sanctioned and robbed by the western world since a hundret years. Russia stupidly wrong blocked to the max by usual suspects, the western idots. Now millions of regular russians get blocked from communicating, participating with the world outside. Blocking Russia hurts the regular poeple all over the world. Outages, shorts, rocketing prizes on allmost everything. Blocking Russia encourages the bad guys everywhere doing the war, that's it. Have You never mind BEFORE blocking Russia extremely? The IV-11 clock pcb I have modified a lot. Have modified many of the parts (dimensions) for using what I have in the shelf. It has removed the useless LED backlighting. The used microcontroler has ability to run the core independently from the output drivers connected to the VFD grids/segments. For bridging a power outage or when moving the clock to another place a pair of two 12 volt A23 batteries creates the needed backup power. That allows running the microcontroller core at app. 2,5mA for a while. The modified power circuitry generates the (negative) DC supply voltages from either: -a fixed negative voltage regulator IC LM2479 -adjustable voltage regulator the GdR made B3370 or similar. It's your choice. Both methodes work. When using the fixed voltage regulator the reference voltage has been lifted up by using a single 3,6volts Z-diode i.e. BZX85C3V6. Attention ! - The (negative polarity!!!!) voltage applied on pin 40 (Vcc) must never exceed (-27) volts. BEFORE seating the microcontroller. -Make sure the LED behind the regulator lights up. -Ensure the voltage spit out by the regulator does not exceed -27,5 volts. There is a voltage drop over the diode 1N4148 , so the supply on the microcontroller should be exactly -27,0V. The supply input on pin1 "Ui" (U indicator) accepts a little higher voltage. Ui switched by the output drivers toward the anodes. For the original schematics see the Radio-Hobby website. The clock runs on a microcontroller made in the USSR K(R)145iK1911 40 pin DIP package. The pitch size: 2,5mm!! Thanks, no imperial crap. Original file source: Radio-Hobby.Org forum Author: Aexander Floka Web site: http://radio-hobby.org/modules/news/article.php?storyid=1532&com_id=14764&com_rootid=14764 The firstly modified PCB has been manufactured successfully. It had small imperfection: some holes make a very tight fit, small silkscreen error (diode orientation). Fixed on the released files. The built clock runs pretty good. No problem. PLEASE take note: For the Gerber files. look for the zip-file It had been disguised as stl-file be cause of the very odd limitations. No more uploading of other files than stl or pictures. The printable housing files are of BETA status. A similar but slightly smaller housing has been made for accomodating the elektronika 413 remake electronics. https://www.thingiverse.com/thing:5261966