Teardown: ELEKTRONIKA MK66 calculator

Vintage scientific calculator made in USSR with vacuum fluorescent display (VFD). Powered by 3xAA or external adapter.
4.5V, 0.45W
VFD up close - it's little dark in daylight (may be effect of limited VFD lifetime), but it is very impressive that this calculator is still working.
Calculator uses only single integrated circuit which is again quite impressive - this IC contains both logic circuits and high voltage VDF driver.
 VFD DC/DC converter.
 Transformer construction is quite intersting.
  Whole PCB.

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