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Products => Test Equipment => Topic started by: rhb on April 16, 2018, 02:08:49 am

Title: Adding an external reference input to a VC3165 counter?
Post by: rhb on April 16, 2018, 02:08:49 am
Has anyone tried this?  It appears to have a 12 MHz reference oscillator.  Read by putting a scope probe on the trimmer, so not very accurate.

I've got one of Leo Bodnar's nifty dual frequency  GPSDOs so no problem feeding it 12 MHz.

I'd like to configure it so that i can use an external reference, but still use the internal reference.
Title: Re: Adding an external reference input to a VC3165 counter?
Post by: coromonadalix on April 16, 2018, 02:26:47 am
some schematics to help, there is a thread here for this counter : https://www.eevblog.com/forum/testgear/victor-vc3165-counter-straight-outta-the-box/msg498745/#msg498745 (https://www.eevblog.com/forum/testgear/victor-vc3165-counter-straight-outta-the-box/msg498745/#msg498745)

schematics

https://www.google.it/search?q=vc3165+schematic&num=20&tbm=isch (https://www.google.it/search?q=vc3165+schematic&num=20&tbm=isch)
http://vrtp.ru/index.php?showtopic=24461 (http://vrtp.ru/index.php?showtopic=24461)
https://www.electronicspoint.com/attachments/vc3165-jpg.5019/ (https://www.electronicspoint.com/attachments/vc3165-jpg.5019/)
Title: Re: Adding an external reference input to a VC3165 counter?
Post by: rhb on April 16, 2018, 05:00:13 am
Thanks.  I used google to search eevblog.com and didn't find that thread.   Of course, I rarely find the same thing on Tuesday that I found on Monday. :-(    It's usually there somewhere in the 47,545 hits.  But I've learned it's a real craps shoot.