ChipAmp PSU Question

korben69 · 9th August 2011, 06:11 PM

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

palstanturhin · 9th August 2011, 06:44 PM

Yes.

korben69 · 9th August 2011, 07:02 PM

Thank you for your answer

I'll give it a try before powering the LM1875.

korben69 · 9th August 2011, 08:02 PM

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...

korben69 · 10th August 2011, 05:17 PM

While assembling the ChipAmp LM3886 kit, I've read the answer to my question in the Manual...

kuldeepsingh · 10th August 2011, 05:42 PM

ya its working fine.

korben69 · 10th August 2011, 05:49 PM

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

kuldeepsingh · 10th August 2011, 05:54 PM

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.

korben69 · 10th August 2011, 06:45 PM

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

digits · 10th August 2011, 06:49 PM

Solid State Power Amplifier Supply Part 1
work your way through these 3 pages, many easy to add filters shown...

10th August 2011, 05:42 PM	#6
kuldeepsingh diyAudio Member Join Date: Aug 2006 Location: Chennai, India	ya its working fine. __________________ . . .. ... ..... ........ ............. ..................... .................................. My Blog

10th August 2011, 05:54 PM	#8
kuldeepsingh diyAudio Member Join Date: Aug 2006 Location: Chennai, India	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. __________________ . . .. ... ..... ........ ............. ..................... .................................. My Blog

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9th August 2011, 06:44 PM	#2
palstanturhin diyAudio Member Join Date: Jun 2011	Yes.

9th August 2011, 07:02 PM	#3
korben69 diyAudio Member Join Date: Nov 2006 Location: Near Lyon	Thank you for your answer I'll give it a try before powering the LM1875.

9th August 2011, 08:02 PM	#4
korben69 diyAudio Member Join Date: Nov 2006 Location: Near Lyon	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...

10th August 2011, 05:49 PM	#7
korben69 diyAudio Member Join Date: Nov 2006 Location: Near Lyon	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

10th August 2011, 06:45 PM	#9
korben69 diyAudio Member Join Date: Nov 2006 Location: Near Lyon	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

10th August 2011, 06:49 PM	#10
digits diyAudio Member Join Date: Apr 2011	Solid State Power Amplifier Supply Part 1 work your way through these 3 pages, many easy to add filters shown...