DIY Speaker Cables and Photo Gallery

Adam's simple DIY Speaker Cables have been added to the DIY Audio Projects website. The cables are very simple, using 16 gauge wires that are braided together. The cables are finished off with TechFlex to produce that nice "Hi-Fi Shop" touch. Adam uses the cables with his DIY Hi-Vi 3-Way Tower Speakers.

In addition, a DIY Audio Projects Photo Gallery has been added to the site. Please feel free to upload photographs of your projects to share with other DIYers.

Related DIY Hi-Fi Cable Projects

• DIY Silver RCA Interconnect Cables
• Belden 89259 RCA Interconnect Cables
• DIY Shielded RCA Interconnect Cables
  
• Cross-connected Belden 89259 DIY Speaker Cables 
• DIY Low-Inductance Speaker Cables
• Belden 83803 DIY Mains Power Cable

What's Playing: The Call - Let the Day Begin

EL84 Push Pull Tube Amplifier

Bruce's latest project, called the "OddWatt" is the EL84/6BQ5 Push-Pull Tube Amplifier shown below.


The driver stage is an SRPP circuit with ECC802S tubes, while ultra linear operation is used for the output stage with Sovtek EL84 tubes. LM317 Regulators are used to produce a constant current source (CCS) to set the bias of the output stage. The power and output transformers are from Edcor. 12VDC from a SMPS is used for the tube heater supply.

Bruce reports that performance from this amplifier is excellent. The low end extension is clean but not excessive. As expected, it has the characteristic tube warmth and is very easy to listen to.


For additional information, pictures and schematics, see the complete page of Bruce's EL84 Push-Pull Tube Amplifier Project.

Related Posts:

• Alex's DIY KT88 Single Ended Tube Amplifier Project
• Bruce's KT77 Push-Pull DIY Tube Amplifier Project
• Bruce's KT88 Push-Pull DIY Tube Amplifier Project
  

What's Playing: The Church - Metropolis

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
• Thomas' TDA2050 Hi-Fi Chip Amplifier (chipamp)
  

What's Playing: Jane's Addiction - Sympathy (on Radio Nigel)

Hi-Vi 3-Way Tower Speaker Project

Adam has constructed a 3-Way DIY Tower Loudspeaker using all Hi-Vi drivers. The speaker enclosure is divided into two parts. A bass reflex portion which contains a single Hi-Vi F8 Woofer and a separate sealed portion that contains a the pair of Hi-Vi F5 mid-woofers and a Hi-Vi SD1.1-A tweeter. The sound is divided using a 3-way 2nd order crossover network shown below.


The speaker enclosure is constructed from MDF and the finish is a black oil based epoxy paint with red oak trim. A picture of the finished speakers in Adams Home Theater room is shown below.


I really like the look of the black black cabinet and red oak trim against the yellow Kevlar cones of the Hi-Vi drivers. Adam excellent bass response and clear and clean sound from these fantastic looking speakers.

For additional information and pictures of this DIY Speaker project, see the DIY Hi-Vi 3-Way Tower Project page.

Related:

• DIY Loudspeaker Projects
  

What's Playing: Stevie Nicks - Rooms on Fire