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Very strange Geiger counter from Russia - BIR-3

Simomax
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Nuts about radioactive everything!

11 months 3 weeks ago #6457 by Simomax

Replied by Simomax on topic Very strange Geiger counter from Russia - BIR-3

Ha! I think I have worked out the two red LEDs flashing pattern.

I was watching the video I made and it hit me like a brick in the face. It's a 2-bit binary counter. The IC is probably a 4-bit binary counter wired to reset on the third bit, thus it goes, 00, 01, 10, 11 and then back to the start. The pulse will increment the counter. Super simple and I feel stupid for not seeing this earlier, but I'll sleep well tonight knowing that!

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Radslug
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11 months 19 hours ago #6468 by Radslug

Replied by Radslug on topic Very strange Geiger counter from Russia - BIR-3

Here's a reference to the purple ceramic one:
https://russian-electronics.com/products/?title=564&submit=&search=2&page=3
(look for 564IE10 / 564ИЕ10 six rows from the bottom)
"Microassemblies 564IE10 are six logical elements NOT with blocking and inhibition."

And what I think is the other one:
https://russian-electronics.com/products/?title=564&submit=&search=2&page=5
(scroll down to 6th row from the top, 564LA7 / 564ЛА7 )
"564LA7 is a CMOS integrated circuit consisting of four NAND2 logic elements."

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Simomax
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Nuts about radioactive everything!

10 months 4 weeks ago #6471 by Simomax

Replied by Simomax on topic Very strange Geiger counter from Russia - BIR-3

That's brilliant Radslug! Thank you! I have also managed to find datasheets for both, in Russian, so I will translate at some point.

So it's not a binary counter, but the LED pattern does seem to act like that. Maybe is that using logic. I would have to investigate further.

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