5 channel chip amps

pmchoong · 05:13 PM

Is it possible to use a single unit PSU to power 5 individual chip amps this way? I'll like to have 5 individual units so I can power up any which one I wish to. Thanks.

ratza · 12th September 2010, 06:44 PM

Yes, it is possible.

pmchoong · 13th September 2010, 02:07 AM

Thanks.

abraxalito · 13th September 2010, 02:15 AM

2A slow blow fuse probably won't last long when feeding a 500VA toroidal - the inrush current will eventually kill it. Suggest you uprate this to a 6.3AT.

If you're looking for the best sound, don't run the shield connection of the RCA inputs directly on to the pcb.

pmchoong · 13th September 2010, 02:23 AM

Quote:

Originally Posted by abraxalito

2A slow blow fuse probably won't last long when feeding a 500VA toroidal - the inrush current will eventually kill it. Suggest you uprate this to a 6.3AT.

If you're looking for the best sound, don't run the shield connection of the RCA inputs directly on to the pcb.

Thank you. What is the alternate way to connect the RCA input then?

abraxalito · 13th September 2010, 02:29 AM

Have a look at this picture - its only for stereo but hopefully you'll get the idea and be able to apply it to your 5 channel set up. The key point is there's no direct wire from the RCA ins to the PCB - they go first to the chassis ground and only then on to the PCB from the central star point.

More grounding

pmchoong · 13th September 2010, 03:00 AM

Hi. There isn't any gnd connection at the amp unit for my 5 channel. I did a pair of monoblocks without the pcb gnd connecting to the chassis gnd and there's no hum. When I connect the pcb gnd to the chassis's gnd, I get a hum.

abraxalito · 13th September 2010, 03:05 AM

Sounds like something's amiss elsewhere in the system then. The principle of taking the RCA shields straight to the star ground still applies, even if the star ground isn't connected to chassis.

pmchoong · 13th September 2010, 03:27 AM

Can it be this way?

abraxalito · 13th September 2010, 03:32 AM

Certainly you could try that - it might work. But you don't show the speaker ground return - is that another separate wire? Don't common the speaker ground with the RCA input ground unless you want an uncontrollable oscillator.

12th September 2010, 06:44 PM	#2
ratza diyAudio Member Join Date: Dec 2007 Location: Sibiu, Romania	Yes, it is possible. __________________ Any solution is a compromise.

13th September 2010, 02:15 AM	#4
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	2A slow blow fuse probably won't last long when feeding a 500VA toroidal - the inrush current will eventually kill it. Suggest you uprate this to a 6.3AT. If you're looking for the best sound, don't run the shield connection of the RCA inputs directly on to the pcb. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

13th September 2010, 02:29 AM	#6
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	Have a look at this picture - its only for stereo but hopefully you'll get the idea and be able to apply it to your 5 channel set up. The key point is there's no direct wire from the RCA ins to the PCB - they go first to the chassis ground and only then on to the PCB from the central star point. More grounding __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

13th September 2010, 03:05 AM	#8
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	Sounds like something's amiss elsewhere in the system then. The principle of taking the RCA shields straight to the star ground still applies, even if the star ground isn't connected to chassis. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

13th September 2010, 03:32 AM	#10
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	Certainly you could try that - it might work. But you don't show the speaker ground return - is that another separate wire? Don't common the speaker ground with the RCA input ground unless you want an uncontrollable oscillator. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen


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13th September 2010, 02:07 AM	#3
pmchoong diyAudio Member Join Date: Jan 2008 Location: Kuala Lumpur	Thanks.

13th September 2010, 03:00 AM	#7
pmchoong diyAudio Member Join Date: Jan 2008 Location: Kuala Lumpur	Hi. There isn't any gnd connection at the amp unit for my 5 channel. I did a pair of monoblocks without the pcb gnd connecting to the chassis gnd and there's no hum. When I connect the pcb gnd to the chassis's gnd, I get a hum.

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