Picking LM3875 gainKlone parts

900mhz · 31st March 2005, 04:00 PM

Hi folks,

I just get confused while preparing my first DIY project - Gainclone LM3875. Need some inputs

Background: Since I'm totally new to DIY, so I plan to get pcb from chipamp.com for easier job.

*For amplifier board
"1500uF Pana 50V capacitors" are supplied in the kit but I see some guys use "1000uF Blackgate N-type" in their gear.
Which one should I use? What's the different?

*For the power supply board
I see "4.7uF BlackGate 50V N-Type" in the guide PDF file, but "10uF Pana 50V capacitors" are actually in the kit.
Which one should I use? What's the different?

*For adding VR
Which VR should I pick? 10K, 50K or 100K?

*For any other parts
Any suggestion on parts or any tweak is welcome

Thanks for your advice.

ultrachrome · 31st March 2005, 04:21 PM

When I started, parts selection was quite overwhelming. There is a sizable contingent of people who are crtical of parts selection but for beginners it can lead to analysis paralysis.

You'll be far better off by just building it with parts you have or can easily get. With that as a baseline, you can then start experimenting with different parts and see if it offers an improvement.

Don't stress yourself out. The standard parts will make a fine amp. Save your money for the new power supply Carlos cooked up. That should have a greater impact.

My understanding of attenuators is go as low as your source will allow as the lower values are supposed to be less noisy. Tell us what your source is and what it's claimed output impedance is.

900mhz · 2nd April 2005, 11:38 AM

ultrachrome, Thanks, you blow off my troubles. I think I'll go with standard kit. My source is "Philips DVD963SA" and Speakers are "ProAc one-sc". A Simple "CD -> GainKlone -> Speakers" system. Please advise me which VR(10K, 50k or 100K) should I pick.

My gears Links
Philips 963SA ProAc oneSC

GregGC · 2nd April 2005, 02:12 PM

Quote:

Originally posted by 900mhz
ultrachrome, Thanks, you blow off my troubles. I think I'll go with standard kit. My source is "Philips DVD963SA" and Speakers are "ProAc one-sc". A Simple "CD -> GainKlone -> Speakers" system. Please advise me which VR(10K, 50k or 100K) should I pick.

My gears Links
Philips 963SA ProAc oneSC

50k is fine. You still have a 22k res from +in to GND I believe.

Happy building!
Greg

31st March 2005, 04:00 PM	#1
900mhz diyAudio Member Join Date: Mar 2005 Location: Mars	Picking LM3875 gainKlone parts Hi folks, I just get confused while preparing my first DIY project - Gainclone LM3875. Need some inputs Background: Since I'm totally new to DIY, so I plan to get pcb from chipamp.com for easier job. For amplifier board "1500uF Pana 50V capacitors" are supplied in the kit but I see some guys use "1000uF Blackgate N-type" in their gear. Which one should I use? What's the different? For the power supply board I see "4.7uF BlackGate 50V N-Type" in the guide PDF file, but "10uF Pana 50V capacitors" are actually in the kit. Which one should I use? What's the different? For adding VR Which VR should I pick? 10K, 50K or 100K? For any other parts Any suggestion on parts or any tweak is welcome Thanks for your advice. __________________ More beer ^^

2nd April 2005, 11:38 AM	#3
900mhz diyAudio Member Join Date: Mar 2005 Location: Mars	ultrachrome, Thanks, you blow off my troubles. I think I'll go with standard kit. My source is "Philips DVD963SA" and Speakers are "ProAc one-sc". A Simple "CD -> GainKlone -> Speakers" system. Please advise me which VR(10K, 50k or 100K) should I pick. My gears Links Philips 963SA ProAc oneSC __________________ More beer ^^

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31st March 2005, 04:21 PM	#2
ultrachrome diyAudio Member Join Date: Jan 2002 Location: Puget Sound	When I started, parts selection was quite overwhelming. There is a sizable contingent of people who are crtical of parts selection but for beginners it can lead to analysis paralysis. You'll be far better off by just building it with parts you have or can easily get. With that as a baseline, you can then start experimenting with different parts and see if it offers an improvement. Don't stress yourself out. The standard parts will make a fine amp. Save your money for the new power supply Carlos cooked up. That should have a greater impact. My understanding of attenuators is go as low as your source will allow as the lower values are supposed to be less noisy. Tell us what your source is and what it's claimed output impedance is.

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