Synergy - LM3875 Gainclone Amplifier

Mark has been hanging out in the kitchen and has put together the Gainclone amplifier shown below.


For the enclosure, Mark has used a heavy cast aluminum cooking pan and a massive wooden cutting board. The amplifier is based around the LM3875 chip (power opamp) and uses point-to-point wiring. The amplifier follows the "rigid and compact" approach of the 47 Laboratory Gaincard amplifier. A rigid enclosure is used to reduce resonance and vibration while a short signal path, feedback loop and minimal parts (compact) are used to preserve information. The schematic of the three resistor amplifier is shown below.


Keep cooking Mark, as I look forward to more of your projects. See the project page for full details of Mark's Synergy - LM3875 Gainclone Chip Amplifier Project.

Related DIY Gainclone Projects:

• Mark's Nano LM3875 DIY ChipAmp (gainclone)
• Bruce's LM3875 DIY Chip Amplifier (Gainclone) Kit
• Gio's LM3886 DIY Chipamp Project Kit
  
• Mark's Point to Point LM3875 Gainclone / ChipAmp instructions
  

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The "Beast" - A LM3875 Chip Amplifier

Bruce has put together a LM3875 based Non-Inverting Chip Amplifier using the LM3875 kits available from audiosector.com. He has affectionately named his project the "Beast". For the enclosure, Bruce used plastic and aluminum project boxes from Radio Shack. The power supply consists of a 200VA toroidal transformer and is housed in a separate enclosure.

Consistent with what most are chip amp kit builders have been finding out, Bruce has found out that these gainclone kits result in a great sounding amplifier at a reasonably low cost. For more information about this project, see The "Beast" - LM3875 Chip Amp.

Related Posts:

• Gio's LM3886 DIY Chipamp Project
• Mark's LM3875 Chipamplifier Project
  

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Nanoo Chip Amplifier (LM3875 Gainclone)

Here is another one of Mark's projects which has been added to DIY Audio Projects website. His latest creation is the compact DIY Nanoo Chip Amplifier (LM3875 Gainclone).

The enclosure for the amplifier is a tiny aluminum box that measures 119 X 94 X 34 mm. The amplifier is based around the popular LM3875 chip using point-to-point wiring. Power to the amplifier is provided via an external power supply which is also housed in an aluminum enclosure.

See the project page for more pictures and information about the Nanoo Chip Amplifier (LM3875 Gainclone) Project.

Related Projects:

• Bruce's LM3875 Chip Amplifier (Gainclone) Kit
• Mark's LM3875 Gainclone Chip Amplifier in a Roasting Pan
  
• Gio's LM3886 DIY Chipamp (Gainclone) Project Kit
  

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LM3886 Chip Amplifier (gainclone)

Originally Posted: 3 May 2006

After several months of planning and acquiring parts, I finally got down to constructing a chip amp (gainclone). The amp uses the National Semiconductor LM3886 chip with printed circuit boards (PCB) purchased from chipamp.com. I finished the amp late last night, so I only have about 3 hours on it and I don’t think it is burnt in. So far it sounds pretty good. It sounds much better than it should given the simplicity and low cost of this amp. There is a lot of power available and the bottom end is very good. It sounds a little bright and tinny to me right now, but I will reserve judgment and make a comparison to my S-5 Electronics K-12M tube amplifier kit after several more hours. More information about this project is available at the LM3886 Chip Amp (gainclone) project page.

Related Projects:

• Bruce's LM3875 Chip Amplifier (gainclone) Kit
• Nano LM3875 ChipAmp (gainclone)
• Mark's DIY LM3875 Gainclone in a Roasting Pan
  

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