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Old 20th December 2011, 04:59 PM   #1
maurycy is offline maurycy  United States
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Default Need help with connections (Brian's LM3875 kit)

Long story short: I am moving once completed LM3875 chipamp to a new case and adding second PSU board and second torroid. I had everything working with one trafo and one PSU board and since my electronics knowledge is limited, I am hoping that somebody here could take a look at the attached connections schematic and let me know if I got everything correctly or not.

connections

Because of the CT torroid, I have only four diodes in each PSU board and I have the necessary jumpers. They are just not shown here.

Thanks.
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Old 31st December 2011, 04:37 PM   #2
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Default power supply connections

Enclosed are the correct PS connections according to Brian's instructions. I don't know anything about the volume control.
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Old 31st December 2011, 05:33 PM   #3
AndrewT is online now AndrewT  Scotland
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Note that both "CHG" are connected to chassis.
Check thoroughly that this does not create a ground loop.
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regards Andrew T.
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Old 6th January 2012, 02:37 PM   #4
maurycy is offline maurycy  United States
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Byron: Thanks for the new diagram. The problem is that my PSU board is modified and contains only 4 diodes (not 8) so PG- and PG+ are linked with jumper on the PSU board. I do not think there is need to run both to AMP board.

AndrewT: According to the documentation for dual-mono system, only CHG needs to be connected to the star ground. I will try that first and report if there are any hum problems.
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Old 24th June 2012, 03:00 PM   #5
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Quote:
Originally Posted by ByronInLawrence View Post
Enclosed are the correct PS connections according to Brian's instructions. I don't know anything about the volume control.
Would you by any chance have a version of this diagram for the stereo build of the chipamp kit?
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