LM3875 Transformer Connection

Kinnja · 19th January 2007, 03:04 AM

Hello All,

I have the LM3875 Gainclone kit. I got a transformer for it but I'm unable to tell from the schematic on the transformer howto connect it to the rectifier boards.

Here is a duplicate of the image on the transformer:

sigurd · 19th January 2007, 05:35 AM

Hi,
RED and ORA is ground and ground return. They must be connected togheter on the grounds of the amp LM3875.
BLK and YEL must go to the alternate 'ins' of the rectifier bridge.
Than you have +positive and -negative from the rectifier bridge.
Succes.

CarlosT · 19th January 2007, 04:47 PM

This is a typical Avel Lindberg tranny color scheme. If you're in the US, you have 115V household power. If both of these things are true then...

Connections are (man I swear I post this like once a week

):

AC POWER IN TO TRANNY (PRIMARIES)

Blue and Purple (Violet?) Together to AC Hot (Black Wire)

Brown and Gray Together to AC Neutral (White Wire)

AC OUT FROM TRANNY TO RECTIFIER (SECONDARIES)

Black and Red Separately to each AC1 hole...doesn't matter which AC1 hole

Orange and Yellow Separately to each AC2 hole...doesn't matter which AC2 hole

Heck...I'll just add some wildcard terms right now so someone will find this

AVEL LINDBERG TRANNY TRANSFORMER TRANSFORMERS TRANNIES SECONDARY PRIMARY SECONDARIES PRIMARIES PHASING DOTS LM3875 LM3875T AUDIO SECTOR AUDIOSECTOR CONNECTION CONNECTIONS COLOR COLORS CONFUSED LOST NOT SURE IDIOT NEWBIE NOOB POWER SUPPLY SUPPLIES PSU RECTIFIER BURNT DOWN THE HOUSE ANDREWT SAFETY GROUND BULB FUSE CHASSIS

CarlosT · 19th January 2007, 04:49 PM

Quote:

Originally posted by sigurd
Hi,
RED and ORA is ground and ground return. They must be connected togheter on the grounds of the amp LM3875.
BLK and YEL must go to the alternate 'ins' of the rectifier bridge.
Than you have +positive and -negative from the rectifier bridge.
Succes.

WOW...that is totally effin' wrong...

Pathmark · 19th January 2007, 05:02 PM

CarlosT,

Yeah I was the newbie from last week, thanks again your explanation it was helpful.

Pathmark

CarlosT · 19th January 2007, 05:58 PM

Hey...I was a noob just weeks before you

Return the favor some day...

AndrewT · 20th January 2007, 09:16 PM

Hi Carlos,
is that to enable you to search or for someone else to search?

CarlosT · 20th January 2007, 11:54 PM

Hey...it's got your name in there

Kinnja · 21st January 2007, 07:36 PM

Quote:

Originally posted by CarlosT
This is a typical Avel Lindberg tranny color scheme. If you're in the US, you have 115V household power. If both of these things are true then...

Yep, true and true.

Thank you Sir.

tamasic1 · 1st February 2007, 03:22 PM

Thanks, needed that info also.
Just gutted an old IBM PCjr case to build the amp. Bought one of BrianGT's kits and that same Avel trans. Snow day here in SC - great day to solder.

19th January 2007, 05:35 AM	#2
sigurd diyAudio Member Join Date: Jan 2007 Location: belgium	connection trafo for LM3875 Hi, RED and ORA is ground and ground return. They must be connected togheter on the grounds of the amp LM3875. BLK and YEL must go to the alternate 'ins' of the rectifier bridge. Than you have +positive and -negative from the rectifier bridge. Succes.

20th January 2007, 09:16 PM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Carlos, is that to enable you to search or for someone else to search? __________________ regards Andrew T.

1st February 2007, 03:22 PM	#10
tamasic1 diyAudio Member Join Date: Dec 2006	avel info Thanks, needed that info also. Just gutted an old IBM PCjr case to build the amp. Bought one of BrianGT's kits and that same Avel trans. Snow day here in SC - great day to solder.

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19th January 2007, 04:47 PM	#3
CarlosT diyAudio Member Join Date: Oct 2006	This is a typical Avel Lindberg tranny color scheme. If you're in the US, you have 115V household power. If both of these things are true then... Connections are (man I swear I post this like once a week ): AC POWER IN TO TRANNY (PRIMARIES) Blue and Purple (Violet?) Together to AC Hot (Black Wire) Brown and Gray Together to AC Neutral (White Wire) AC OUT FROM TRANNY TO RECTIFIER (SECONDARIES) Black and Red Separately to each AC1 hole...doesn't matter which AC1 hole Orange and Yellow Separately to each AC2 hole...doesn't matter which AC2 hole Heck...I'll just add some wildcard terms right now so someone will find this AVEL LINDBERG TRANNY TRANSFORMER TRANSFORMERS TRANNIES SECONDARY PRIMARY SECONDARIES PRIMARIES PHASING DOTS LM3875 LM3875T AUDIO SECTOR AUDIOSECTOR CONNECTION CONNECTIONS COLOR COLORS CONFUSED LOST NOT SURE IDIOT NEWBIE NOOB POWER SUPPLY SUPPLIES PSU RECTIFIER BURNT DOWN THE HOUSE ANDREWT SAFETY GROUND BULB FUSE CHASSIS

19th January 2007, 05:02 PM	#5
Pathmark diyAudio Member Join Date: Jan 2007	CarlosT, Yeah I was the newbie from last week, thanks again your explanation it was helpful. Pathmark

19th January 2007, 05:58 PM	#6
CarlosT diyAudio Member Join Date: Oct 2006	Hey...I was a noob just weeks before you Return the favor some day...

20th January 2007, 11:54 PM	#8
CarlosT diyAudio Member Join Date: Oct 2006	Hey...it's got your name in there

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