After building the Micro-Amp, I was not only impressed with the performance of the LM4780, but also felt ready to tackle a more ambitious metalwork project. This is the result: four channels, with options for bi-amping and bridging.
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Front view of the amplifier. It's a compact design, measuring 36 by 9.5 by 17.5 cm approx.
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A look at the corner. This amplifier was almost entirely constructed from recycled materials.
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Rear view, showing all the connections and mains switch and fuse and the 12V trigger input.
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A close-up of one half, showing the mode switch and the input and output connectors.
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Top cover removed - the interior is dominated by the custom-made torroidal transformer.
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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.