Milan Wendt
NETHERLANDS, THE • + Follow
Tools, APP Software Used etc.
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KiCad 9.0 |
Description
Stereo buffer & isolation V2.1
Stereo buffer | preamp with isolated output aimed at 19 Inch rack equipment. Input volume can be boosted up-to 10dB.
This design is intended to be used in a modular configuration, where it functions as the input / output stage for an audio effect or preamp.
This version includes a relay and simple switch connector for toggling the isolation on|off.
Transformer isolation:
- Zin ~1M Ohm
- Zout ~600 Ohm
- THD+N @ 1kHz ~0.05% (Increased THD below ~200Hz).
- SNR ~100dB
- Crosstalk ~70dB
- For a flat (±1dB) frequency response: requires an additional load on the output of 680Ohm in series with 10nF.
Without transformer isolation:
- Zout ~0.3 Ohm
- THD+N improves to ~0.0015%
- Frequency response improves to ±0.04dB
Schematic and Layout
Schematic V2.1.pdf
Interactive BOM
Aug 22,2025
218 views
Stereo buffer & isolation V2.1
Stereo buffer module designed for DIY rack equipment for guitar / instruments.
218
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Published: Aug 22,2025
Standard PCB
Download Gerber file 7
BOM(Bill of materials)
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Only PCB
PCB+Assembly
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Attribution-NonCommercial (CC BY-NC)
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