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ChipAmp PSU Question
ChipAmp PSU Question
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Old 9th August 2011, 06:11 PM   #1
korben69 is offline korben69  France
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Default ChipAmp PSU Question

I've finished building a LM1875 kit from BrianGT, works fine !
I've got a spare PSU board designed for LM3886, BrianGT design too.
Wondering if I could use this one for my LM1875 amps ?

My trouble is that there are +V/+PGND and -V/-PGND pins on the DC side.
PSU is tested and OK, about + & -26V DC with 2x18AC/160VA rated trafo.
Could I wire together -PGND and -PGND safely ?
IMHO yes, but your confirmation is awaited
Regards
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Old 9th August 2011, 06:44 PM   #2
palstanturhin is offline palstanturhin  Finland
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Yes.
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Old 9th August 2011, 07:02 PM   #3
korben69 is offline korben69  France
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Thank you for your answer
I'll give it a try before powering the LM1875.
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Old 9th August 2011, 08:02 PM   #4
korben69 is offline korben69  France
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Replaced the standard LM1875 ChipAmp PSU with the one designed for LM3886.
Works perfectly fine, seems to me that bass are more defined and deepest...
More listening is required before tweaking.
Thanks again for your input palstanturhin

PS : BTW I've got a fully functional & tested LM1875 PSU for sale...
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Old 10th August 2011, 05:17 PM   #5
korben69 is offline korben69  France
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While assembling the ChipAmp LM3886 kit, I've read the answer to my question in the Manual...
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Old 10th August 2011, 05:42 PM   #6
kuldeepsingh is offline kuldeepsingh  India
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ya its working fine.
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Old 10th August 2011, 05:49 PM   #7
korben69 is offline korben69  France
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Yep that's right, tested and approved
I've got a "plop" while powering off the amp...
Do you have a tip to solve it ?
Thanks
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Old 10th August 2011, 05:54 PM   #8
kuldeepsingh is offline kuldeepsingh  India
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plop is there in my system due to connection with PC and DTH reciever when i together switch off the amplifier and reciever. with ipod, there is no plop.
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Old 10th August 2011, 06:45 PM   #9
korben69 is offline korben69  France
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I've tried with or without USB/DAC connected, actually my main and only source.
As you mentionned, the DAC is connected to a PC, battery powered.
Same result, in both cases, when powering off... plop
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Old 10th August 2011, 06:49 PM   #10
digits is offline digits
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Solid State Power Amplifier Supply Part 1
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