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Old 31st March 2005, 04:00 PM   #1
900mhz is offline 900mhz  United States
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Default 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.
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Old 31st March 2005, 04:21 PM   #2
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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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Old 2nd April 2005, 11:38 AM   #3
900mhz is offline 900mhz  United States
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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
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Old 2nd April 2005, 02:12 PM   #4
GregGC is offline GregGC  Canada
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Location: Toronto
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
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