67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
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# Assembly Guide — Talas One Condenser Microphone
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> **Status**: Work in progress. This guide will be completed and validated through fresh rebuilds as part of the open hardware publication process.
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## Prerequisites
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### Tools
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- Soldering station with fine tip (e.g., Toolcraft ST-100D or equivalent)
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- Stereo microscope or magnifying lamp — required for SMD component inspection
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- Multimeter with continuity mode
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- Oscilloscope (recommended for debugging)
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- Tweezers (for SMD placement)
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- Solder wire (0.5mm recommended for SMD, 0.8mm for through-hole)
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- Flux (no-clean)
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- Isopropyl alcohol + brush for cleaning
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### Components
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See the [BOM](../bom/) for the complete parts list with sourcing links.
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### PCBs
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Both PCBs can be ordered from any PCB fabrication service (e.g., PCBWay, JLCPCB) using the gerber files in [`hardware/gerbers/`](../hardware/gerbers/).
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Specifications:
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- 2-layer PCB
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- 1.6mm thickness
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- HASL finish
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- Standard FR4
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## Assembly Order
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### Step 1 — Preamp Board
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1. Start with SMD components (OPA1642AIDR op-amp)
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2. Then through-hole resistors and capacitors
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3. Finally connectors
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### Step 2 — Hex Inverter Board
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1. SMD components (TC4584BF)
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2. Through-hole passives (resistors, capacitors, diodes)
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3. Connectors
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### Step 3 — Mechanical Assembly
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1. Mount both PCBs in the microphone body
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2. Connect inter-board wiring
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3. Connect capsule leads
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4. Close body (standard screwdriver — no glue)
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### Step 4 — Testing
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1. Connect XLR cable to audio interface with 48V phantom power
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2. Verify bias voltage with multimeter (~60V DC expected)
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3. Check preamp output with oscilloscope
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4. Audio test in DAW
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## Debugging
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If the microphone produces no audio output, follow this systematic approach:
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1. **Visual inspection** — Check all solder joints under microscope for bridges or cold joints
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2. **Continuity test** — Verify all connections match the schematic netlist
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3. **Voltage rails** — Measure phantom power delivery (48V), bias voltage (~60V), and preamp supply
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4. **Signal tracing** — Use oscilloscope to follow signal from capsule through each stage
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See also the hex inverter test guides in `hardware/hex-inverter/` for board-specific testing procedures.
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