Langevin Eq 251A, Another View

opacheco · Aug 2, 2022

Hello again,

In this days I have taken some time to look at of the schematic of this magnificent equipment piece. I suppose everybody of us have seen the Rick Chinn courtesy LANGEVIN EQ251A schematic but I found something interesting in that schematic that I would like to know if someone could confirm it.

If you see the attached schematic below, I have underlined in red color a couple of details (finger error maybe!) that in my opinion should be verify in a real unit(I never have had a unit like this in my hands) because it change the performance of the unit totally.

The second one attached pic look like to me be the right connection of these parts(underlined in green color).

I have also attached a schematic from another point of view with the above suggested fixes. I could be wrong and I want to be clear on that to you! for this reason I want to get a second opinion.

However, I have made a Block Diagram, the T filter, the Series Bank of Filters and the total schematic as well for the complete unit. I hope to get some feedback from some of you soon!

Thanks a lot
opacheco

opacheco · Aug 3, 2022

Any comment?
opacheco

opacheco · Aug 4, 2022

I thought this post will be a interesting issue for someone but I suppose not!
???…
opacheco

emrr · Aug 6, 2022

At a glance I suspect you are right. The top left in particular. I recall things not making total sense when working on a Hycor variant, there are differences but some things seemed nonsensical in difference.

opacheco · Aug 6, 2022

emrr said:
At a glance I suspect you are right. The top left in particular. I recall things not making total sense when working on a Hycor variant, there are differences but some things seemed nonsensical in difference.

emrr, Thanks for your comments.
Ok!….I found something rare too in the Rick Chinn schematics, then I made these schematics and block diagram in order to see if everything have any sense in that schematics!!

opacheco