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Help with PS for TAB V376a Modular Synthesizers
Old 31st December 2010
  #1
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myles's Avatar
 

Help with PS for TAB V376a

I might be revealing my lack of electronic knowledge here, so please be kind...

I just bought a TAB V376a that came with a 24V power supply mounted in a rack that looks like it was built for three power supplies. The rack has a terminal strip with six terminals, three for +24V and three for -24V. There's a retrofitted 31-pin connector inside the rack for the pre with pigtails terminated in XLR's for input/output. They look to be connected as per the pinout.

The 0V outputs are tied to chassis ground as it's currently set up. There are two other PS outputs (from 0V and +24V) which have come loose from their connections on the 31-pin connector for the pre.

The pre worked fine with this PS, according to the seller. I haven't been able to contact him yet, so I'm not yelling "foul!" until I can verify what's going on. The loose PS connections are making me go back over the whole setup.

As far as I can tell, the power supply only puts out +24V, while the V376a needs both +24V and -24V, according to the schematic and pinout I have. As both +24V and -24V would need to be referenced to 0V, I'm confused.

The power supply is a Ton und Studiotechnik Typ N 324/4A3. Is anyone familiar with this PS? It's a handsome beast, and built like a tank, but I'm thinking it might not do what I need.

Pinout of the V376a is attached. Any help would be greatly appreciated.

Old 1st January 2011
  #2
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myles's Avatar
 

I guess New Year's day isn't the day to ask for help! heh

Anyway, just to close this up, in case anyone is ever looking for the answer to this question, and they have the same dense matter between their ears that I do: use a straight 376 schematic. The pinout for the 376a that's floating around is confusing. +24V to pin 31, 0V (which is also -24V if you're referencing the +24V level) to pin 29. Tie 0V to chassis ground. Everything else is pretty clear on the schematics and pinouts.
Old 2nd January 2011
  #3
Here for the gear
 

Hi Myles,
just stumbled across your new thread...
the schematics you posted (which I posted a while ago) are a little confusing, but I am sure that "+" means +24V and "-" means 0V.
As far as I know all the western german broadcast stuff uses +24V only (and not +24V / -24V).

Your suggestion "+24V to pin 31, 0V (which is also -24V if you're referencing the +24V level) to pin 29. Tie 0V to chassis ground." is correct. I am running my V376a´s like that and they work great.

You mentioned the (older) V376. The pinout of the V376a seems identical to me, except for the Räuspertaste (= mute switch) which is not present on the V376 and the phantom power connection, which is also missing on the V376: the V376a has two internal resistors for the +48V phantom power, the V376 needs external resitors for the phantom power.

Hope that helps,
Tobias
Old 2nd January 2011
  #4
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S2udio's Avatar
 

From an archive i had

here's the pin-out:

1/2 in
18 out unbal.
19/20 out bal.
22/23 bridge (out xformer center taps)
29 0v
30 chassis
31 +24v
consumes about 95mA max.

mic inputs only. circuit layout is different from v676.
Old 29th May 2011
  #5
Gear Head
 

hallo,
might be a confusing question,

if i connect the 48v phantom power output from the power supply
to pin 13 of the preamp, then the 48v is always on, right?

trough which wire of the XLR output will the phantom power run?

cheers,

jeroen
Old 5th June 2011
  #6
Lives for gear
 

R1&R2 6.8k feed resistors

if you need to switch the phantom on/off, install a switch before the module so that you switch the pin 13 wire. that easy.

see front end schematic:
Attached Images
File Type: jpg 25uh-b.jpg (63.4 KB, 566 views)
Old 8th June 2011
  #7
Gear Head
 

thanks for the extra info,

but now, how do i connect multiple preamps to the power supply,
i read that the psu can work with 40 preamps (i'll soon have two)

i just put two wires in the psu output and solder them together?
(1 goes to preamp1 and the other to preamp2 ?)
Old 9th June 2011
  #8
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in my old rack ( like a lunch box) the connectors were paralleled in the card cage (power and grounds).


I am trying to find my schematic for the backplane these modules rack up
with n324 power supply

but I did find some notes (that survived the studio fire)

grounds on the connector ( if not listed)
pin 29,28,25,24,21,17,12,11,8,7,3
pin 30 chassis ground

pin 18 direct coupled output for meter bridge

pin 19+22 600 ohm balance out pin 19 hot (rec out)

pin 23 + 20 600 ohm balanced out pin 23 hot (to mixer)

link 22+23 for single line out (unlink if Mixer Module installed)

pin 31 +24V

pin 14 mute ( used with talk back module)

pin 13 phantom


pin 1/2 Mic in pin 1 hot


I used pins 19+22 to tape machine, pins 23+20 went to a mixer I used for headphone mixes.
Old 27th August 2017
  #9
Here for the gear
I'm about to rack a pair of v376fb's and this is a big help.

Can I just hook any vu meter straight up to pin 18?

Quote:
Originally Posted by drtechno View Post
pin 18 direct coupled output for meter bridge
Old 27th August 2017
  #10
Lives for gear
 

Quote:
Originally Posted by dukeofearl View Post
I'm about to rack a pair of v376fb's and this is a big help.

Can I just hook any vu meter straight up to pin 18?
You would still need to use a buffer amp between the VU meter and pin 18 (which is the hi-z unbalanced output).
Old 28th August 2017
  #11
Here for the gear
ah ok thanks.

Quote:
Originally Posted by Audiospacific2 View Post
You would still need to use a buffer amp between the VU meter and pin 18 (which is the hi-z unbalanced output).
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