Commercial Gainclone kit- building instructions - Page 160

AndrewT · 24th April 2012, 02:22 PM

battery life.

Peter Daniel · 25th April 2012, 02:02 PM

I've been running one of my amps from batteries for over a year. They were 6x 12V Panasonic cells providing approx +/-39V . Didn't observe any long term problems.

MagnumOpus · 25th April 2012, 02:22 PM

Mr Daniels, I have recently bought and assembled your LM3875 kit, chassis is in the making and I am trying to decide to give my amp a volume pot or a buffered volume control, what do you reckon?

I allready have a tiny opamp volume buffer from SKA Audio, needing only a psu for it, or simply put in a 50k Alps? I really don't want to spend too much money on the pot. If it sounds good its good enough

Peter Daniel · 25th April 2012, 02:31 PM

A potentiometer mounted directly at amp's input works best, I usually recommend 25K or 10K.

MagnumOpus · 25th April 2012, 06:37 PM

Quote:

Originally Posted by Peter Daniel

A potentiometer mounted directly at amp's input works best, I usually recommend 25K or 10K.

Thank you.

TomTerrific · 26th April 2012, 02:13 AM

Peter, So how did the amp sound when powered by batteries? I can't imagine the battery power supply would make any appreciable improvement in sound quality, (My amp sounds terrific) but I can imagine the "flavor" of the sound could change somewhat, maybe making it even more agreeable. Batteries don't cost that much. Is this worth pursuing?

autoformer · 27th April 2012, 03:26 AM

I'm guessing that battery power will lower the noise floor. I'll report back to the thread when I've cot mine up and running. I am going to try an Aikido LV tube preamp stage in front of the chip amp. Planning to run both it and the amp on a 26.5VDC LiFePO4 pack. I just can't imagine how rectified power can possibly be as clean as pure battery power. I've heard arguments on both sides, but ultimately, you've got to try it yourself to find out.

I got on this battery kick when I built a linear power supply for my Squeezebox Touch. Amazing difference, even when using the digital outputs, and it got me thinking. Next, I tried running my tube preamp (an Elekit TU-875), which came with a switching wall wart power supply, on a LiFePO4 battery pack. The improvement was staggering. I was honestly not prepared for such an improvement.

Quote:

Originally Posted by TomTerrific

Peter, So how did the amp sound when powered by batteries? I can't imagine the battery power supply would make any appreciable improvement in sound quality, (My amp sounds terrific) but I can imagine the "flavor" of the sound could change somewhat, maybe making it even more agreeable. Batteries don't cost that much. Is this worth pursuing?

bobfig · 28th April 2012, 07:06 AM

im in the process of building one of these and im a little stuck. i am wondering if i need isolated rca jacks when mounting on a aluminum enclosure or would regular ones without the isolation washers do. i have a pair of uninsulated from a previous project that i didn't need them for so i don't want to have to order new ones if i don't have to.

Marra · 28th April 2012, 07:12 AM

You need to use isolated ones.

bobfig · 28th April 2012, 08:29 AM

K

25th April 2012, 02:02 PM	#1592
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	I've been running one of my amps from batteries for over a year. They were 6x 12V Panasonic cells providing approx +/-39V . Didn't observe any long term problems. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

25th April 2012, 02:22 PM	#1593
MagnumOpus diyAudio Member Join Date: Feb 2011 Blog Entries: 1	Mr Daniels, I have recently bought and assembled your LM3875 kit, chassis is in the making and I am trying to decide to give my amp a volume pot or a buffered volume control, what do you reckon? I allready have a tiny opamp volume buffer from SKA Audio, needing only a psu for it, or simply put in a 50k Alps? I really don't want to spend too much money on the pot. If it sounds good its good enough __________________ My Blog: http://www.diyaudio.com/forums/blogs/magnumopus/

25th April 2012, 02:31 PM	#1594
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	A potentiometer mounted directly at amp's input works best, I usually recommend 25K or 10K. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

26th April 2012, 02:13 AM	#1596
TomTerrific diyAudio Member Join Date: Jul 2007 Location: Deep in the Heart of Texas	Peter, So how did the amp sound when powered by batteries? I can't imagine the battery power supply would make any appreciable improvement in sound quality, (My amp sounds terrific) but I can imagine the "flavor" of the sound could change somewhat, maybe making it even more agreeable. Batteries don't cost that much. Is this worth pursuing? __________________ DIY "Career" - TriTrix Speakers, "Repackaged" Tripath T Amp, Stereo LM3886, B1 Buffer, Dual Mono LM3875, Boozhound Labs JFET Phono Pre // Trust me, I'm a musician.

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24th April 2012, 02:22 PM	#1591
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	battery life.

28th April 2012, 07:06 AM	#1598
bobfig diyAudio Member Join Date: Aug 2009 Location: H-Town	im in the process of building one of these and im a little stuck. i am wondering if i need isolated rca jacks when mounting on a aluminum enclosure or would regular ones without the isolation washers do. i have a pair of uninsulated from a previous project that i didn't need them for so i don't want to have to order new ones if i don't have to.

28th April 2012, 07:12 AM	#1599
Marra diyAudio Member Join Date: Nov 2009 Location: Near Lincoln	You need to use isolated ones.

28th April 2012, 08:29 AM	#1600
bobfig diyAudio Member Join Date: Aug 2009 Location: H-Town	K

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