V475 translation + summing network

[Moby]

I dropped e-mail to Haufe. Asked is it possible to order RK292 from them. Let's see :roll:

 

[Moby]

I think that's time for refreshing this. Nothing from Hufe, but i just finished auction on German E-bay for two V475-2 :wink: I hope that modules are in good shape, and really need some info about pinning :green:
Also, does somebody have idea for skipping low-pass ft. I would like to hear this baby over 15khz

 

[solder_city]

ok, since nobody else has bothered to ask, i will:

what the hell is 'transflation?'

is that a combination of 'translation' and 'inflation?'

:razz:

 

[rafafredd]

No, that´s a typo. :wink:

Anyway, here is the schem of the C version, as promissed:

http://hps.infolink.com.br/rafafredd/V475-2C_schem.gif

It would be nice if someone can mirror this image, as I had to make it big to make it readable, and I don´t have lots of space on my server, and I´ll probably delete it soon.

PS. Ethan, can you turn the autoresize on again? It worked nice for weeks...

 

[BradAvenson]

ok, here is a mirror.
http://www.avensonaudio.com/tech/V475-2C_schem.gif

 

[Moby]

Cool, and here's redrawed and optimized :wink:
http://img187.exs.cx/img187/6730/v4752cschem8xt.jpg

 

[Moby]

BTW, any news about pinning :?:

 

[synthi]

Hi People,

Now I`m the proud owner for a neumann V475-2 module :grin:

I`d like to build a 16 channels summing box with l-c-r pan swithes and maybe volume controls (input attenuators) for each channel.

The module I own is a v475-2 without letters (not A, B or C versions) and I just have a pinout and some data I`ll try to scan and post here.
Trying to read german language betwen lines, it seems that the v475-2 version don`t need the Rg resistors, I think the gain is set by a couple of trimmers in the board. That could be useful for anyone with an A, B or C version trying to add a varible gain pot instead of fixed resistor gain.
the pinout is similar except for the Rg(not used) and +24 for channel2 is located at pins 3-4 instead 29-30 as the other versions.
Well, now I (we) need an schematic....

:!: Anyone?

Synthi.

 

[synthi]

:razz:
Check here:

http://img.photobucket.com/albums/v321/synthi/v475-2/v475-2-1.jpg
http://img.photobucket.com/albums/v321/synthi/v475-2/v475-2-2.jpg
http://img.photobucket.com/albums/v321/synthi/v475-2/v475-2-3.jpg
http://img.photobucket.com/albums/v321/synthi/v475-2/v475-2-4.jpg

Now can anyone that can read german translate the diferences between v475-2 and V475-2A?

Also check the diagram in page 4 for adding a 15K pot to a v475-2A for remote gain control!

Best Regards,

Synthi

 

[Steffen]

[quote author="synthi"]:razz:


Now can anyone that can read german translate the diferences between v475-2 and V475-2A?


Synthi[/quote]

according to description the v475-2 has no external connection for feedback adjustment (Rg).

steff

 

[synthi]

Thanks steffen, I noticed that. Also I think the 475-2 could have extended frequency? the data say >= 8dB @50Khz for 475-2, and >=20dB @40Khz for A version (?). Internal trimming is +-3dB for the 475-2 and +-1,5dB for the A version. Otherwise seems the same than the A version with Rg=6.2K

Synthi.

 

[Moby]

At last I'm holding my V475-2 boards in hands. I didn't try to connect , but will be nice to cancel LPF and extend this little beast for full range bandwidth. I understand for V475-2b that this filter is separate board and "removing"opens to 200khz, but 475-2 has no separate board and I'm not sure what to remove. Any comments? :?

 

[[silent:arts]]

the schematic is here
play arround C9
(the "Prüfvorschrift !! german language only!! has something about adjusting frequency response with C9)

 

[Moby]

Thanks! :wink: :thumb:
BTW, have you ever heard how sounds 475-2?

 

[hang10]

hi there everybody from a newbie! :grin:
I´ve just got me a v475-2 (no ABC) and found your thread.

>Rafafredd:
did you succeed in building your summing amp?
did you include symmetrical panning?
if so, how does it sound?

>Synthi:
how did you wire up your L-C-R inputs?

>everybody else:
-any hints on the L-C-R wiring?
-on this card, even though it does not provide external output gain setting, what would be the way to do so (with switchable resistors maybe?)

thanks a lot for your valuable contributions so far!!

hang 10 :thumb:

 

[[silent:arts]]

[quote author="Moby"]Thanks! :wink: :thumb:
BTW, have you ever heard how sounds 475-2?[/quote]
I must hear them every day, we still have more then 20 Neumannn Mixers at work :roll:
Ronald Prent told me at Live Aid that he likes the Neumann Sound a lot :green:

 

[[silent:arts]]

Welcome to the group hang 10!
[quote author="hang10"]any hints on the L-C-R wiring?[/quote]
I decided to go the easy way, only L and R inputs, wired the same way like Neumann did it:

while I have the 475-2B I decided to have gain switched (-6, -4, -3, -2, -1, 0, +1, +2, +3, +4, +6 dB).
still waiting for the case

 

[Moby]

I decided to have gain switched (-6, -4, -3, -2, -1, 0, +1, +2, +3, +4, +6 dB).

Nice :wink: Did you connected switch as the variable Rg? What values of resistors you calculated for gain? :roll:

 

[[silent:arts]]

[quote author="Moby"]What values of resistors you calculated for gain? :roll:[/quote]
claculated and measued (for 5k1 input):
+6 = nc
+4 = 48K7
+3 = 30K9
+2 = 21K5
+1 = 15K4
0 = 11K8
-1 = 9K09
-2 = 7K15
-3 = 5K62
-4 = 4K42
-6 = 2K67

 

[Moby]

Thanks, :thumb: