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Chip Amps Amplifiers based on integrated circuits

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Old 12th July 2003, 02:36 AM   #1
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Default Is Marlin P. Jones Cloneing around?

When I got home this afternoon and checked the mail, my glossy new Marlin P. Jones catalogue had arrived. Immediately my body prepared to pump out some endorphins as I sat down on the couch skimming for that perfect bargain, geeky nirvana.

I hadn’t even opened the cover when I spotted the little pink box in the lower right corner:
“25 Watt Mono Amplifier Kit”

LM1875IC, a handful of caps and resistors, and a PC board. $9.95
Heat sink and Power supply not included
Stock # 6050-KT

Not a lot of information available on the web site, no picture, but they did offer this description:

“ Kit uses the National LM1875 IC and contains the essential components to build a Hi-Fi mono amplifier. Delivers 20W RMS into 8 ohms @ .015% THD (25W Max) A heatsink with a thermal resistance of 1.4 deg C/W is required& must be supplied by you. The IC contains thermal & short circuit protection .Requires +& - 25V supplies. L: 2-1/8" W: 2" H: 1" WT: .1”

Has any one else seen this or tried the kit? For ten bucks they cant be great caps, but this might not be a bad place for a person teetering on the edge of gain-cloning to start.
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Old 12th July 2003, 06:41 AM   #2
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Is it similar to this Quality Kit? About the same price.

http://www.qkits.com/serv/qkits/diy/pages/QK50.asp

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Old 13th July 2003, 04:18 AM   #3
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The catolog photo is a little small, and the components are loaded, but yes, I think it might be the same.
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File Type: jpg gainc2.jpg (41.6 KB, 221 views)
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Old 13th July 2003, 05:17 AM   #4
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would make a great student project!!!
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Old 13th July 2003, 06:32 AM   #5
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I built a pair of those a year ago as my first DIY amp project. I used a cheap CT transfo from All Electronics and RS pots. It sounds better than my old Marantz receiver and has been doing garage/office PC duty ever since. For $40 in parts, its hard to fault.

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