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audiophonics.com

@audiophonics.com

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audiophonics.com @audiophonics.com · 28/01/2025

The Zeus Passive-Preamp/Line-Driver, also built in 2007.

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audiophonics.com @audiophonics.com · 28/01/2025

Pair of Zeus75 amps, sitting on their power-supplies, built in 2007. The heatsinks are 300 x 200 x 85mm in size. These use the depletion MOSFETS, and run at about 60W bias.

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audiophonics.com @audiophonics.com · 28/01/2025

My Zeus75 prototype, built in 2005. This runs with a higher B+ supply and the bias is set higher at 750mA per MOSFET, hence the much larger heatsink.

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audiophonics.com @audiophonics.com · 28/01/2025

Pics of one of the two original Zeus35 power-stage amplifiers which I built in 1995. The pair of amps are still in daily use, unmodified from their original construction thirty years ago.

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audiophonics.com @audiophonics.com · 28/01/2025

Audiophonics Introduction: My audio projects based around my transformer based amplification topology, which I started developing in 1994, now over thirty years ago! This audio-path implementation schematic shows depletion mode MOSFETs, eg IXTH20N50D, which auto-bias on the windings DC resistance.

Schematic of my transformer based amplification topology, which I started developing in 1994; now over thirty years ago!
The schematic shows the audio-path implementation using four transformers and three depletion mode MOSFETs (which auto-bias on the DC resistance of the transformer windings they are connected to).

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