Please see my Audiophonics website for most recent information. These pages remain as I transfer and update the contents and will be consolidated to link across to my Audiophonics website.

---

General Amplifier Schematic

Amplifier Highlights

• Zero feedback.
• Balanced and isolated input and outputs.
• Output configurable to drive any impedance load, from electrostatics to sub-ohm parallel linear array loudspeakers
• Good EMI/RFI performance.
• Low voltage operation ( sub 60 volts ), no potentially lethal HT.
• Only two power semiconductors required for Push Pull version.
• Minimum components, little opportunity for noise generation (150 dB signal to noise ratio).
• No capacitors in the audio signal path.
• "Direct" signal connection from input to output.

Introduction & General Description of Operation

 

Zeus System - Pre + Power Full end to end configuration with TX-102 TVC input.

ZEUS	MOSFET SE Pre-amp & PP MOSFET Power Amp Tests.
	6C33C SE Pre-amp & PP MOSFET Power Amp Tests.

Zeus-75 Class A monoblock power amplifier with separate PSU.

Zeus 75 Amplifier and Power Supply Concept CAD Image

Zeus 75 Distortion versus Power Output.

Use with 4 ohm impedance speakers with 2:1 step down output is not normally recommended but this graph is to demonstrate the amplifier operation where distortion level plateaus at 1% (unlike conventional amplifiers where it would continue to rise).

Power at maximum output is over 100 watts.

---

DIY	Building a Zeus - Information on Construction
	Input Transformer Specification
	Output Transformer Specification - 75W
	MOSFET Matching with L200 Current Source
	FFT Test Result with 2SK1529 Audio FETs

These transformers are now available direct from Sowter to order online, see Parts for DIY page on my Audiophonics website.

Zeus Pre-amp / Line Drivers SE and PP pre-amplifier variations.

	Zeus SE MOSFET Line Driver - info & FFTs TX-102 variable attenuator mosfet preamp line stage.
	Zeus 6C33C Triode PP Line Driver - info and FFTs
	Zeus PP MOSFET Line Driver - info & variations including SE & toroid output transformer.

Zeus 35 Monoblock Power Amplifier My original prototype power amplifier.

Original Zeus 35 Amplifier - One of a Pair.

	Original IRFP150 35 W Amplifier built in 1995 With FFT and THD+N test results
	35W Output Transformer Specification

Additional Experimental Information These pages show examples of what can be done with the Zeus topology.

	Single Ended Version
	Toroid Transformer Version 3rd March 05 (updated schematic plus added notes).
	2 Stage Amplifier - Variations
	Schematic Diagrams - misc 2nd March 05 (added temperature tracking Vbias schematic).
	Output Transformer Tri-Filar Winding Illustration.
LINKS	Links to suppliers and information

Please see my Audiophonics website for most recent information. These pages remain as I transfer and update the contents and will be consolidated to link across to my Audiophonics website.

Design by: Susan Parker, MIEE.

The information contained here may be used to construct one set of amplifiers specifically for personal NON commercial use only.

N.B. Personal liability disclaimer applies.

This page last modified on: 11th November 2006

All information, drawings and images Copyright © 1994 - 2006 Susan Parker unless otherwise credited.