A4 Power Amplifier:

Impressed with the LM4780, and wanting an ambitious metalwork project, I designed a 4 channel power amplifier with bi-amping and bridging options.

Front view of the amplifier. It's a compact design, measuring 36 by 9.5 by 17.5 cm approx.	A look at the corner. Most parts in this amplifier were recycled, including the heatsinks and all metalwork.	Rear view, showing all the connectors and mains switch and fuse.
A close-up of one half, showing the mode switch.	Top cover removed - the inside is dominated by the custom-made torroid....	Showing how each heatsink assembly is readily removed for servicing.

In-depth project details:

• Overview - Introduction to the amplifier.
• Analogue circuit design - Implementing the LM4780.
• Control circuits - The PIC-based control system.
• Power supply - Details of the custom-made torroid and the power supply.
• Construction - Building the the enclosure from "recycled" materials.
• Conclusions - So far I'm impressed!
  
  
• Full Schematics - Complete circuit details.