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The first Soviet transistors work

image From time immemorial, I wore germanium transistors P1A and P3A. Year of release - 1957. Well, maybe they are not the first, but from the first publicly available, for sure. I decided to do something with them. Who is interested in what happened, please proceed below.

I had three transistors of these, so it was decided to use two, and one for the exhibition (vertically located piece of plexiglass).
Measurement of parameters showed that they are all in a state close to comatose. When measuring the resistance of the transitions in the forward and reverse directions, the ohmmeter readings differed barely. I thought that it would not be possible to amplify or generate something on such transistors. I decided to try to build something that works in a more rigid mode. For example, multivibrator.
So, the multivibrator itself, on two P1A transistors. The load of each of them is a current key on P3A, in the collector of which there is an older relay with normally open contacts (this is also to click, and not just blink). The relay contacts include a light bulb. One relay is red, the other is green.
The principle scheme of a symmetric multivibrator on pnp transistors out of respect for the professional community is not given. Nominal resistors had to pick up forgetting all the textbooks on radio engineering. I looked at the reference data of transistors only in order not to exceed the maximum permissible parameters. But when something moved on the oscilloscope ... understand my feelings. I myself did not expect.
Naturally, the installation was made in an open design in the style of "radio circle of the Palace of Pioneers". Passive elements also from that time. Resistors - VS, capacitors - VZR (Voronezh plant of radio components). Bulbs - NSM-6,3-20 in special holders with colored lights. Also old.
It would be curious to find out, is there anywhere else something working on these transistors?
Commentator Easterism kindly suggested that I insert a link to these transistors. With appreciation I perform: www.155la3.ru/p1.htm
Under the link - the video of what happened.


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Source: https://habr.com/ru/post/261449/


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