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:

• Mark's Nano LM3875 DIY ChipAmp (gainclone)
• Mark's LM3875 Gainclone Chip Amplifier in a Roasting Pan
• Gio's LM3886 DIY Chipamp Project Kit
  
• Mark's Point to Point LM3875 Gainclone / ChipAmp instructions
• Thomas' TDA2050 Hi-Fi Chip Amplifier (chipamp)

What's Playing: Aztec Camera - Oblivious (Remix)

K-502 Tube Amplifier Kit & The DelSol Speaker

Barry has put together his first two DIY Audio Projects. A build of the inexpensive K-502 Tube Amplifier Kit and the DelSol Speaker.


The enclosure for the K-502 Tube Amp Kit is wood and plexiglass.


The DelSol projects uses the Aura NS3-194-8E fullrange driver. For the enclosure, Barry used 3/4" MDF and 1/2" oak.


Together these two simple DIY projects make a simple hi-fi unit. For more information, see Barry's project page the DIY K-502 Tube Amplifier Kit and Aura NS3-194-8E DelSol Speaker.

Related DIY Audio Projects:

• K-502 Valve (Vacuum Tube) Amplifier Kit
• Aura NS3-194-8E DIY Bookshelf Speaker Project

What's Playing: Duran Duran - Like An Angel

DIY 5687 Tube Preamplifier

The latest addition to the DIY Audio Projects website is a fine looking tube preamplifier constructed by Vincent Wong. The tube preamp is based around a pair of 5687 twin triodes. Each channel uses both sections of a 5687 tube and LED biasing is used on each section.


To keep hum at a minimum, the filaments are heated using DC. The power supply is external to the preamp section and consists of a RCA-83 mercury rectifier and two 50H chokes.


For more project details including schematics and an enclosure construction guide, see: DIY 5687 LED Biased Tube Preamplifier.

Related Tube Preamplifier Projects:

• Mark's build of the DIY 12AX7 Tube Preamplifier Kit
• Bruce's build of the DIY 12AX7 Tube Preamp Kit
• Alan's simple DIY 12AX7 / 12AU7 Tube Preamplifier
  

What's Playing: Fleetwood Mac - Landslide

12AX7 Tube Preamplifier Kit

This is Mark's build of a simple and inexpensive 12AX7 tube preamplifier kit from Silicon Chip magazine. What makes this kit inexpensive (and interesting) is that power comes a switch mode power supply, which is fed from a 17 volt DC wall wart! To silence the skeptics of a switch mode power supply in a tube circuit, Mark has completed a number of measurements on the power supply as well as the preamp. Mark's modifications to the preamp kit include the addition of snubbers and upgraded capacitors. The end result is a simple DIY tube preamplifier that sounds great and will keep some money in your pocket for your next DIY Audio project.

For more detailed information about Mark's latest project, see the project page, a DIY 12AX7 Tube Preamp kit.

Related Posts:

• Bruce's DIY 12AX7 Tube Preamplifier Kit
  

What's Playing: Pearl Jam - Glorified G