board
Diode-Bridge Voltage-Controlled Attenuator
Public Unreviewedby John Lauer
Two-layer through-hole audio attenuator: four 1N4148s as a current-biased shunt bridge, 0 to 2 V control, designed by Saif Abdessayed with Adom Hydrogen
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John Lauer
Saif Abdessayed's diode-bridge VCA: KiCad project, Gerbers, BOM, simulations, reports, and the earlier RC filter test
45f3ff6
11d ago
Diode VCA attenuator prototype
This folder is a self-contained KiCad 10 project for a diode-bridge voltage-controlled attenuator powered from external regulated ±12 V rails.
Start with:
diode-vca-attenuator.kicad_pro— native KiCad projectdocs/engineering-review.md— topology, assumptions, calculations, simulation and unresolved issuesbom/diode-vca-attenuator-bom.csv— exact MPN BOM and sourcing snapshotassembly/assembly-notes.md— hand-assembly and bring-up notesreports/check-summary.md— ERC/DRC/parity summary; raw replies are beside itsimulation/results/— retained ngspice logs and summariesimages/— schematic and board SVG/PNG exportsmanufacturing/fabrication-release/— only the layers/files intended for a prototype fab upload
Important: J1 expects already regulated +12 V / GND / -12 V. The design has not been physically built, measured, safety-reviewed, or approved by a PCB fabricator.
# Diode VCA attenuator prototype
This folder is a self-contained KiCad 10 project for a diode-bridge voltage-controlled attenuator powered from external regulated ±12 V rails.
Start with:
- `diode-vca-attenuator.kicad_pro` — native KiCad project
- `docs/engineering-review.md` — topology, assumptions, calculations, simulation and unresolved issues
- `bom/diode-vca-attenuator-bom.csv` — exact MPN BOM and sourcing snapshot
- `assembly/assembly-notes.md` — hand-assembly and bring-up notes
- `reports/check-summary.md` — ERC/DRC/parity summary; raw replies are beside it
- `simulation/results/` — retained ngspice logs and summaries
- `images/` — schematic and board SVG/PNG exports
- `manufacturing/fabrication-release/` — only the layers/files intended for a prototype fab upload
Important: J1 expects already regulated `+12 V / GND / -12 V`. The design has not been physically built, measured, safety-reviewed, or approved by a PCB fabricator.