Manuel Caldeira

PORTUGAL • + Follow

foontzoot

CANADA
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CANADA
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António Pinto da Costa

PORTUGAL
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- 4
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UNITED STATES OF AMERICA
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5

Description

Audio Dummy Load Switcher Using Relays

An audio switcher that switches between a speaker output, or a resistive dummy load - 8Ω or 4Ω - using relays. My previous version used toggle switches, that had a tendency to become intermittent, caused by the build-up of tarnishing on the switch contacts, due to the low levels the I normally work with. This one, using Panasonic relays, should be a lot more reliable.

Schematic and Layout

Schematic

Schematic_Dummy-Load-Switcher_2025-06-14.pdf

Download Gerbers

Jun 15,2025

1,084 views

Audio Dummy Load Switcher Using Relays

2 Layers PCB 57.2 x 99.1 mm FR-4, 1.6 mm, 1, HASL with lead, Green Solder Mask, White silkscreen

An audio switcher that switches between a speaker output, or a resistive dummy load - 8Ω or 4Ω - using relays to get cleaner switching.

1084

Published: Jun 15,2025

Standard PCB

Download Gerber file 31

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