{
  "type": "transformer",
  "specs": [
    {"name": "turns_ratio", "description": "Primary to secondary turns ratio"},
    {"name": "voltage_primary_v", "description": "Primary voltage rating", "unit": "V"},
    {"name": "voltage_secondary_v", "description": "Secondary voltage rating", "unit": "V"},
    {"name": "current_rating_a", "description": "Maximum current rating", "unit": "A"}
  ],
  "subtypes": {
    "transformer.power": {
      "description": "Power transformer",
      "extra_specs": [
        {"name": "power_rating_w", "description": "Maximum power rating", "unit": "W"},
        {"name": "isolation_voltage_v", "description": "Isolation/withstand voltage between windings", "unit": "V"}
      ]
    },
    "transformer.signal": {
      "description": "Signal / isolation transformer",
      "extra_specs": [
        {"name": "isolation_voltage_v", "description": "Isolation/withstand voltage between windings", "unit": "V"},
        {"name": "insertion_loss_db", "description": "Insertion loss", "unit": "dB"},
        {"name": "bandwidth_hz", "description": "Operating bandwidth (-3dB)", "unit": "Hz"}
      ]
    }
  }
}