Elektronika C3-15
Inside the rear. The terminals for the unusual batteries are at the bottom.
Rear circuit board showing the integrated circuits in circular packages.
Elektronika C-15.
Display is scientific, 10 digits mantissa & 2 digits exponent, red LED.
Scientific functions.
Integrated circuits - At least 7, Soviet manufactured, one here date coded early 1976.
6v (4 x CNK0.45 batteries) .
88 x 170 x 31 mm (3.5" x 6.7" x 1.25").
Made in USSR (Union of Soviet Socialist Republics) by the Svetlana company of Leningrad (now St. Petersburg, Russia).
Elektronika (meaning Electronic) calculators were produced in the USSR from 1974 to the early 1990s. This example strangely has the Elektronika name covered by a sticker displaying "Electronic", maybe for a market outside the
USSR.
Most of the markings on the keys are familiar, but some use the cyrillic alphabet.
The batteries required are of a type only available within the USSR and neighbours.
The USSR lagged behind the West and Japan in semiconductor and display technology. Their first hand-held calculator developed in great haste and introduced in 1973 appears to have been largely based on imported technology. Many models with largely local electronics were subsequently produced under the Elektronika name, but in general look dated when compared with the models of the West and Asia of the same period.
See also the page on this site about the MK33 with LED display from 1990.
