Soviet digital clock "Elektronika 2-06" (Электроника 2-06) was produced in USSR during 1980's.
The schematic is very simmilar to Elektronika 6.15 and Elektronika 6.15M.
It was built with flat 4-digit 7-segment VFD display IVL1-7/5 (ИВЛ1-7/5) or ILC4-5/7L (ИЛЦ4-5/7Л) with 21mm high digits.
Integrated circuits (CMOS):
K176IE18 (К176ИЕ18) - Crystal oscillator and prescaler.
K176IE13 (К176ИЕ13) - Clock circuit (24h mode, 4-digit).
K176ID3 (К176ИД3) - BCD to 7 segment decoder.
The clock is controlled by 32768 Hz crystal. It has 2 levels of brightness.
I measured the power consumption to be cca 2.2W at low brightness and 2.5W at high brightness.
Control buttons:
1. Big top button - Enables / disables alarm. When the alarm is enabled, the bottom dot blinks.
2. Small top button - Selects low or high brightness.
3. МИН - Set minutes (can only be set when high brightness is selected).
4. ЧАС - Set hours (can only be set when high brightness is selected).
5. КОРР - Reset. This will set minutes to 00. Pressing this button is required before setting the time.
6. БУД - Display alarm. While holding this button, use buttons МИН and ЧАС to set alarm. The upper dot lights up while you hold this button.
When I got this clock, the heater filament of the VFD display was open, despite it looked visually OK.
The vacuum was also OK according to the color of the getter. After VFD replacement and cleaning, the clock works perfectly.
