Zach W

UNITED STATES OF AMERICA • + Follow

aleciofv
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Pavel Collee Foley

UNITED KINGDOM
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325-ish Universal Output Board v1_0 Mockup.png

Tools, APP Software Used etc.

Cadsoft Eagle

Description

(Another) 325~ISH UNIVERSAL OUTPUT BOARD - 2025 edition

This project is an alternative version of my 325 EQP-1A Make-up Gain project from 2024.

The big way this layout differs from the 2024 board is that it has pin headers that you can use to hook it up in an inverting configuration, along with pin headers for various primary and secondary strapping options of the output transformer.

Attached .pdf doc contains schematics, partial BOM, and a lot of random references to other similar line amp stages that you can use for reference when determining your configuration and component value choices. The BOM included with this one is vvvvvery bare bones and not as straightforward as the 2024 version.

...and as explicitly stated: this is an open-source project for D.I.Y. purposes only, not for resale and not for profit.

Schematic and Layout

325-ish Universal Output Board v1_0 Schematic BOM and Docs (Compressed).pdf

Apr 06,2025

298 views

(Another) 325~ISH UNIVERSAL OUTPUT BOARD - 2025 edition

Output gain stage based on API 325 line amp and the line amp used in the solid-state Pultec EQP1A3. OPEN SOURCE. NOT FOR RESALE.

298

Published: Apr 06,2025

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File Last Updated: 2025/04/06 (GMT+8)

File update record

2025-04-0610:03:29

Gerber file is updated.

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