Gertius

Racking Neve B205 EQ card
« on: February 24, 2021, 01:43:23 PM »
Hi all,
I recently got some Neve B205 cards delivered from Russia and would like to rack them:
http://www.avdaudio.com/catalog.htm?id=1470

I also have the 1073 schematic from here:
https://www.technicalaudio.com/neve/neve_pdf/1073-fullpak.pdf

Unfortunately I find it hard to read the schematic and understand how the B205 is integrated.

Here is hoping that one of you can help me with my following questions:
- which pins are Input/Output of the B205? I see 4 traces going to the main "bus" (M,H,F,K)
- Is this a completely passive EQ circuit, or would I need some sort of Opamp after the card? 
- I am only interested in the LF section. If I want to omit the HF part, can I omit some parts in the surrounding, or on the B205 cards themselves?
- What is RV2 for? Some sort of calibration?
- do I need other parts except the immediate surrounding parts from the schematic?

Thanks and best,
Christian


Coop

Re: Racking Neve B205 EQ card
« Reply #1 on: February 27, 2021, 02:06:48 AM »
Hi,

Hope I can help a little bit.

-Pin F on the B205 should your input, Pin H the Output
-in the 1073 Module there is a discrete amp in series. It lives on the B184 board
-think that would be possible, but why would you do that?
-RV2 is the front panel mount potentiometer for boost and cut of the preselected low frequency with S3
-well you definitely need the switch and pot, an op amp like on the B184 board and a power supply for the amp

Hope this helps a little

Whoops

Re: Racking Neve B205 EQ card
« Reply #2 on: February 27, 2021, 02:30:06 AM »
What is the B205 card?

Coop

Re: Racking Neve B205 EQ card
« Reply #3 on: February 27, 2021, 02:41:03 AM »
It contains the Low and High Frequency section of the 1073

shabtek

Re: Racking Neve B205 EQ card
« Reply #4 on: February 27, 2021, 07:48:54 AM »
It looks like some capacitors and a few resistors on a plug in card and nothing more.
the signal buffering/gain make up comes from the cards with transistors.

not an ideal starting point for a functional N∂V∂-like project but an opportunity to learn;

yes you will likely need some active components
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

Gertius

Re: Racking Neve B205 EQ card
« Reply #5 on: March 04, 2021, 06:04:58 AM »
Hi guys,
thanks a lot for your replies!
Ah I guess the project would be a bit more complicated than I initially thought.
Don't really know if I'm up for it.
Anyway, thanks!


 

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