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-   -   LM3875 Transformer Connection (http://www.diyaudio.com/forums/chip-amps/94578-lm3875-transformer-connection.html)

Kinnja 19th January 2007 03:04 AM

LM3875 Transformer Connection
 
2 Attachment(s)
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

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.

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 :D ):


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 :D

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

Re: connection trafo for LM3875
 
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 :D

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 :D

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

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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