# Acorn Archimedes A305 Restoration - Audio Fix! Filter Mod & Burr-Brown Op Amp Upgrade

> Ever wanted to fix that dull, flat, muted audio on your Acorn Archimedes? In this HOWTO I'll show you how to upgrade your Archie's audio by fitting a higher spec op amp and removing some unneccessary filtering components for the best possible output.

- Canonical URL: https://ctrl-alt-rees.com/2020-09-03-acorn-archimedes-audio-upgrade-filtering-op-amp.html
- Published: 2020-09-03
- Last updated: 2020-09-04
- Author: Rees (ctrl-alt-rees)
- Video: https://www.youtube.com/watch?v=8Dk2-kwR9ys (16:42)
- Licence: CC BY-SA 2.0 UK (https://creativecommons.org/licenses/by-sa/2.0/uk/), unless stated otherwise below

Watch on YouTube: https://www.youtube.com/watch?v=8Dk2-kwR9ys

Ever wanted to fix that dull, flat, muted audio on your Acorn Archimedes? In this HOWTO I'll show you how to upgrade your Archie's audio by fitting a higher spec op amp and removing some unneccessary filtering components for the best possible output.

**Relevant Links:**

Previous Archimedes Restoration Update: [https://youtu.be/xk0z6wG_xzs](https://youtu.be/xk0z6wG_xzs)

Zarchos YouTube Channel: [https://www.youtube.com/user/Archimedes75009](https://www.youtube.com/user/Archimedes75009)

Simple DIY method to get unfiltered high quality sound on your Archimedes: [https://stardot.org.uk/forums/viewtopic.php?f=16&t=13630&sid=c2e7083471210bd4ad4bf27c18fdb4c5](https://stardot.org.uk/forums/viewtopic.php?f=16&t=13630&sid=c2e7083471210bd4ad4bf27c18fdb4c5)

Better sound for the Archimedes with OPA4134PA Burr Brown OA: [https://stardot.org.uk/forums/viewtopic.php?t=11287](https://stardot.org.uk/forums/viewtopic.php?t=11287)

Steve Harrison's Website (inc QTM tracker): [http://pi-star.co.uk/](http://pi-star.co.uk/)

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**Music Credit:**

Royalty-Free Music From Epidemic Sound: [https://www.epidemicsound.com](https://www.epidemicsound.com)