Siemens 276a pinout/translation help!!

Tungsten · 18th March 2004, 12:01 AM

Hi there;

I'm just putting a couple 276a's in a rack-on the pinout it shows a couple 150uf caps(back to back unpolarized??) hooked up to a couple pins....ignoring this and powering up it won't pass audio, so I'm looking at that now...anyone have experience with these or knows what this is for? Upon tracing inside the module the two traces go to the input transformer...not sure what's going on here.

gyraf · 18th March 2004, 09:59 AM

The 276A schematic..

http://www.creativestudios.com.br/philip/v276a.gif

(grab it while it's there, you may need it later on..)

..shows that pins 10 and 12 are centre tap primaries for the input transformer.

If they're not connected, the unit will get no input signal at all.

If you use it with a signal source without DC potential, simply connect pins 10 and 12.

For possibly DC-infected input signals, connect them through the shown two electrolytics. Use audio-grade types here, as your low-level input signal will pass them.

Jakob Erland
Gyraf Audio

adamcal · 19th March 2004, 01:11 PM

Does this apply to the V276 as well?

(ie not "a")

gyraf · 19th March 2004, 02:36 PM

Yes.

http://www.creativestudios.com.br/philip/v276.jpg

..get the schematic while you can..

Jakob E.

echorec · 20th March 2004, 12:33 AM

Hi Jakob,

Do you know if there is a W295b schematic on the web?

volki · 20th March 2004, 02:24 AM

Quote:

Originally posted by echorec
Hi Jakob,

Do you know if there is a W295b schematic on the web?

i have schematics which i could scan and email you. just pm me!

echorec · 20th March 2004, 10:35 AM

Thanks!

I´ve pm:d you.

adamcal · 20th March 2004, 10:47 AM

just thought id show you guys my little work in progress, my third such little box for mic pre's.

adamcal · 20th March 2004, 10:48 AM

the back

echorec · 20th March 2004, 10:51 AM

Looks great Adam,

I love the sound of these, I am going to rack a couple of W295b modules myself.

adamcal · 20th March 2004, 10:55 AM

Thanks, the blank black metal pannel on the front is where the Phase and phantom switches go (top), and a power light (bottom centre). Im thinking high bright blue LED for power.

echorec · 20th March 2004, 10:59 AM

Blue LED would be cool. Why would you have phantom power on an EQ?

Got inspired by your racking, gonna start my project today.

adamcal · 20th March 2004, 11:11 AM

its 2 SIEMENS V276 mic pres.

here is a link to my older boxes

V72's and 695 EQ's

http://gearslutz.com/board/showthrea...&threadid=7942

echorec · 20th March 2004, 11:13 AM

oops, didn´t look close enough

ddanyboy · 22nd February 2005, 12:15 AM

meybe you guys can help me out with this thread..

http://www.gearslutz.com/board/showt...highlight=372d

thanx!

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18th March 2004, 12:01 AM	#1
Tungsten Gear nut Join Date: Jul 2003 Location: Guelph Posts: 101	Siemens 276a pinout/translation help!! Hi there; I'm just putting a couple 276a's in a rack-on the pinout it shows a couple 150uf caps(back to back unpolarized??) hooked up to a couple pins....ignoring this and powering up it won't pass audio, so I'm looking at that now...anyone have experience with these or knows what this is for? Upon tracing inside the module the two traces go to the input transformer...not sure what's going on here. Attached Thumbnails

19th March 2004, 01:11 PM	#3
adamcal Lives for gear Join Date: Dec 2002 Location: Melbourne, Australia Posts: 1,120	Does this apply to the V276 as well? (ie not "a") __________________ Adam Calaitzis www.toyland.com.au

20th March 2004, 10:47 AM	#8
adamcal Lives for gear Join Date: Dec 2002 Location: Melbourne, Australia Posts: 1,120	just thought id show you guys my little work in progress, my third such little box for mic pre's. Attached Thumbnails __________________ Adam Calaitzis www.toyland.com.au

20th March 2004, 10:48 AM	#9
adamcal Lives for gear Join Date: Dec 2002 Location: Melbourne, Australia Posts: 1,120	the back Attached Thumbnails __________________ Adam Calaitzis www.toyland.com.au

18th March 2004, 09:59 AM	#2
gyraf Lives for gear Join Date: Jun 2002 Location: Denmark Posts: 500	The 276A schematic.. http://www.creativestudios.com.br/philip/v276a.gif (grab it while it's there, you may need it later on..) ..shows that pins 10 and 12 are centre tap primaries for the input transformer. If they're not connected, the unit will get no input signal at all. If you use it with a signal source without DC potential, simply connect pins 10 and 12. For possibly DC-infected input signals, connect them through the shown two electrolytics. Use audio-grade types here, as your low-level input signal will pass them. Jakob Erland Gyraf Audio

19th March 2004, 02:36 PM	#4
gyraf Lives for gear Join Date: Jun 2002 Location: Denmark Posts: 500	Yes. http://www.creativestudios.com.br/philip/v276.jpg ..get the schematic while you can.. Jakob E.

20th March 2004, 12:33 AM	#5
echorec Lives for gear Join Date: May 2003 Location: Europe Posts: 966	Hi Jakob, Do you know if there is a W295b schematic on the web?

20th March 2004, 10:35 AM	#7
echorec Lives for gear Join Date: May 2003 Location: Europe Posts: 966	Thanks! I´ve pm:d you.

20th March 2004, 10:51 AM	#10
echorec Lives for gear Join Date: May 2003 Location: Europe Posts: 966	Looks great Adam, I love the sound of these, I am going to rack a couple of W295b modules myself.

20th March 2004, 10:55 AM	#11
adamcal Lives for gear Join Date: Dec 2002 Location: Melbourne, Australia Posts: 1,120	Thanks, the blank black metal pannel on the front is where the Phase and phantom switches go (top), and a power light (bottom centre). Im thinking high bright blue LED for power. __________________ Adam Calaitzis www.toyland.com.au

20th March 2004, 10:59 AM	#12
echorec Lives for gear Join Date: May 2003 Location: Europe Posts: 966	Blue LED would be cool. Why would you have phantom power on an EQ? Got inspired by your racking, gonna start my project today.

20th March 2004, 11:11 AM	#13
adamcal Lives for gear Join Date: Dec 2002 Location: Melbourne, Australia Posts: 1,120	its 2 SIEMENS V276 mic pres. here is a link to my older boxes V72's and 695 EQ's http://gearslutz.com/board/showthrea...&threadid=7942 __________________ Adam Calaitzis www.toyland.com.au

20th March 2004, 11:13 AM	#14
echorec Lives for gear Join Date: May 2003 Location: Europe Posts: 966	oops, didn´t look close enough

22nd February 2005, 12:15 AM	#15
ddanyboy Gear maniac Join Date: Feb 2005 Posts: 191	meybe you guys can help me out with this thread.. http://www.gearslutz.com/board/showt...highlight=372d thanx!

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