Zeus Power Amplifier

1 kHz Square Wave - 8 ohm Load
This page has a series of 1.00 kHz square wave tests, the most recent at the top.

Test 3: New Line Driver - RC Series Filter on Input TX Secondaries

1 kHz square wave, one cycle, 40 V pp, 50 Watts into 8 ohms.

  • Top trace: output to load, 10 V per division.

  • Bottom trace: input to amplifier line driver, 5 V per division.

  • 100 uS (0.1 mS) per division.

  • 1 kHz signal, 20 Vac RMS into 8 ohm load = 50 Watts.

  • 35 W transformer.

  • 8 ohm load @ 1 kHz =  8.024 ohms, 3.6 uH on 12 foot cable.

Notes:

This test has an additional RC filter across the input transformer secondaries. This is to remove the overshoot which is causing ringing on the fast edges.

This shows that the slew rate of the line driver needs to be controlled - a good thing for RFI/EMC anyway.

Test 2: New Line Driver - Preview

1 kHz square wave, one cycle, 40 V pp, 50 Watts into 8 ohms.

  • Top trace: output to load, 10 V per division.

  • Bottom trace: input to amplifier line driver, 5 V per division.

  • 100 uS (0.1 mS) per division.

  • 1 kHz signal, 20 Vac RMS into 8 ohm load = 50 Watts.

  • 35 W transformer.

  • 8 ohm load @ 1 kHz =  8.024 ohms, 3.6 uH on 12 foot cable.

Test 1: Op-Amp Line Driver

1 kHz square wave, one cycle.

  • Top trace: input to amplifier, 200 mV per division, one half of 600 ohm balanced line.

  • Bottom trace: output to load, 2 V per division, full signal.

  • 100 uS (0.1 mS) per division.

  • 1 kHz signal, 2.82 Vac RMS into 8 ohm load.

  • 35 W transformer.

  • 8 ohm load @ 1 kHz =  8.024 ohms, 3.6 uH.

1 kHz square wave, rising edge.

  • 2 uS per division.

1 kHz square wave, falling edge.

  • 2 uS per division.

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This page last modified on: 27th October 2004

All information, drawings and images Copyright © 1995 - 2004 Susan Parker unless otherwise credited.