Kevin Mossey

Pilot, tinkerer. He/him. Interested in learning all the things.

United States
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This user joined on 04/01/2021.

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Mitsuru Yamada wrote 05/20/2021 at 02:52 point

Thank you for liking my project #Nixie Clock by TTL/CMOS ! For my using Nixie own work, I have a video of a Nixie tube frequency counter I made myself about 45 years ago on my YouTube site.

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Kevin Mossey wrote 05/20/2021 at 19:53 point

Oh that frequency counter is beautiful!  And it's 45 years old?  It's as old as me!  I'm so glad it still runs!  Any idea why it seemed to have trouble above 42MHz?  Is that because the 41MHz is the limit?

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Mitsuru Yamada wrote 05/21/2021 at 01:17 point

Thank you for watching my video. The reason why the frequency limit is 41MHz is because it is the limit of the operating frequency of the SN74H00 and SN74196, the standard logic ICs in the input stage. Current frequency counters on the market use a prescaler IC such as MB507 (Max 1.6GHz) in the first stage to convert the frequency to 1/128 or so before counting. 

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