LM3875 Transformer Connection - diyAudio
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Old 19th January 2007, 03:04 AM   #1
Kinnja is offline Kinnja  United States
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Default LM3875 Transformer Connection

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:
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File Type: jpg trans_schem.jpg (13.1 KB, 560 views)
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Old 19th January 2007, 05:35 AM   #2
sigurd is offline sigurd  Belgium
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Default 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.
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Old 19th January 2007, 04:47 PM   #3
CarlosT is offline CarlosT  United States
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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
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Old 19th January 2007, 04:49 PM   #4
CarlosT is offline CarlosT  United States
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Default 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...
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Old 19th January 2007, 05:02 PM   #5
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CarlosT,

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

Pathmark
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Old 19th January 2007, 05:58 PM   #6
CarlosT is offline CarlosT  United States
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Hey...I was a noob just weeks before you

Return the favor some day...
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Old 20th January 2007, 09:16 PM   #7
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
Hi Carlos,
is that to enable you to search or for someone else to search?
__________________
regards Andrew T.
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Old 20th January 2007, 11:54 PM   #8
CarlosT is offline CarlosT  United States
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Hey...it's got your name in there
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Old 21st January 2007, 07:36 PM   #9
Kinnja is offline Kinnja  United States
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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.
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Old 1st February 2007, 03:22 PM   #10
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Default 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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