Zeus Power Amplifier

Input Transformer.

Close up showing sectioned bobbin/windings.


Turns ratio:
    Parallel = 1:20
    Series = 1:10

Inductance of primary winding:
    Parallel = 31 mH @ 1 kHz, 141 mH @ 120 Hz.
    Series = 100 mH @ 1 kHz, 544 mH @ 120 Hz.

Inductance of secondary winding:
    Each = 2 H @ 1 kHz, n/a @ 120 Hz.

Inter-winding capacitance between input and output windings = 208.3 pF

Input impedance in circuit when powered:
    Parallel = 165 .
    Series = 667 .

Termination Resistor (see schematic) = 120 K (Adjust to obtain flat frequency response and match source drive impedance.)

E. J. Sowter # 8160


A M6/Mumetal 50/50% core version is an option.

Note however that Mumetal saturates at a lower level than M6 (40%?) so a 100% Mumetal core is not always advised.

The use with Mumetal laminations does make a measurable improvement, reducing mid-band distortion however the lowest end for LF distortion is not quite as good.

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Amplifier Design by: Susan Parker, MIEE.

The information contained here may be used to construct one set of power 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 1995 - 2006 Susan Parker unless otherwise credited.