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Old 29th November 2006, 12:03 PM   #1
diyAudio Member
Join Date: Jun 2006
Default Gainclone and center tap

Building my first Gainclone here with LM3875-kit from Audiosector.

The transformer i have is with center tap, ie three wires. I plan on using on psu-board for both channels.

I have read the manual and searched but i am still not sure how to connect it with the Rev. B kit.

As i have done now, i have only 4 diodes on psu-board as described in manual. The center-tap is connected to PG+, also as the manual says, but if i do that i am short of one PG+ that should be connected to the other two boards?
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Old 29th November 2006, 01:20 PM   #2
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Join Date: Jun 2006
I think i got it.
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Old 29th November 2006, 02:12 PM   #3
AndrewT is online now AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
sounds like you discovered that each amplifier board needs only one power ground connection. The two PGs are directly connected on the amplifier PCB.

As an aside, I think the performance of the stereo amplifier set-up is improved if you run two PSUs fed from a pair of shared secondary tappings. i.e. a separate rectifier and pair of smoothing caps for each amplifier.
regards Andrew T.
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