{
  "id": "timer",
  "revision": 1,
  "supply_v": 5,
  "measured": false,
  "spice_simulated": false,
  "pcb_qualified": false,
  "sources": [
    {
      "title": "Texas Instruments NE555 — SLFS022K, March 2026",
      "url": "https://www.ti.com/lit/ds/symlink/ne555.pdf"
    }
  ],
  "accessories": [
    {
      "ref": "BOARD",
      "quantity": 1,
      "value": "PDIP8",
      "text_key": "part_board"
    },
    {
      "ref": "SUPPLY",
      "quantity": 1,
      "value": "5.00 V",
      "text_key": "part_bench"
    },
    {
      "ref": "TEST",
      "quantity": 1,
      "value": "DMM / ×10",
      "text_key": "part_instruments"
    }
  ],
  "test_points": {
    "TP0": "GND",
    "TP1": "V5",
    "TP2": "TIMING",
    "TP3": "OUT",
    "TP4": "TRIGGER"
  },
  "assembly_keys": [
    "assembly_1",
    "assembly_2",
    "assembly_3",
    "timer_assembly_1",
    "timer_assembly_2",
    "assembly_6"
  ],
  "testing_keys": [
    "test_1",
    "timer_test_1",
    "timer_test_2",
    "timer_test_3",
    "test_5"
  ],
  "troubleshooting_keys": [
    "diag_supply",
    "diag_pinout",
    "timer_diag_1",
    "timer_diag_2",
    "diag_noise"
  ],
  "components": [
    {
      "ref": "J1",
      "type": "connector",
      "value": "5 V DC",
      "pins": {
        "1": "V5",
        "2": "GND"
      },
      "text_key": "part_supply",
      "quantity": 1
    },
    {
      "ref": "U1",
      "type": "ic",
      "value": "NE555P",
      "pins": {
        "1": "GND",
        "2": "TRIGGER",
        "3": "OUT",
        "4": "RESET",
        "5": "CONTROL",
        "6": "TIMING",
        "7": "TIMING",
        "8": "V5"
      },
      "text_key": "part_555",
      "quantity": 1
    },
    {
      "ref": "CDEC",
      "type": "capacitor",
      "value": "100 nF / 16 V",
      "pins": {
        "1": "V5",
        "2": "GND"
      },
      "text_key": "part_decouple",
      "quantity": 1
    },
    {
      "ref": "CBULK",
      "type": "capacitor",
      "value": "47 µF / 16 V",
      "pins": {
        "+": "V5",
        "-": "GND"
      },
      "text_key": "part_bulk",
      "quantity": 1
    },
    {
      "ref": "CCONT",
      "type": "capacitor",
      "value": "10 nF / 16 V",
      "pins": {
        "1": "CONTROL",
        "2": "GND"
      },
      "text_key": "part_control",
      "quantity": 1
    },
    {
      "ref": "RRESET",
      "type": "resistor",
      "value": "1 kΩ / 0.25 W",
      "pins": {
        "1": "V5",
        "2": "RESET"
      },
      "text_key": "part_reset",
      "quantity": 1
    },
    {
      "ref": "RT",
      "type": "resistor",
      "value": "100 kΩ / 1%",
      "pins": {
        "1": "V5",
        "2": "TIMING"
      },
      "text_key": "part_rt",
      "quantity": 1
    },
    {
      "ref": "CT",
      "type": "capacitor",
      "value": "10 µF / 20% / 16 V",
      "pins": {
        "+": "TIMING",
        "-": "GND"
      },
      "text_key": "part_ct_electrolytic",
      "quantity": 1
    },
    {
      "ref": "RTRIG",
      "type": "resistor",
      "value": "10 kΩ / 0.25 W",
      "pins": {
        "1": "V5",
        "2": "TRIGGER"
      },
      "text_key": "part_trigger",
      "quantity": 1
    },
    {
      "ref": "START",
      "type": "switch",
      "value": "NO",
      "pins": {
        "1": "TRIGGER",
        "2": "GND"
      },
      "text_key": "part_start",
      "quantity": 1
    },
    {
      "ref": "STOP",
      "type": "switch",
      "value": "NO",
      "pins": {
        "1": "RESET",
        "2": "GND"
      },
      "text_key": "part_stop",
      "quantity": 1
    },
    {
      "ref": "RLED",
      "type": "resistor",
      "value": "2.2 kΩ / 0.25 W",
      "pins": {
        "1": "OUT",
        "2": "LED_A"
      },
      "text_key": "part_led_resistor",
      "quantity": 1
    },
    {
      "ref": "LED1",
      "type": "led",
      "value": "LED",
      "pins": {
        "A": "LED_A",
        "K": "GND"
      },
      "text_key": "part_led",
      "quantity": 1
    }
  ],
  "formulas": [
    "t ≈ 1.1 RT CT = 1.1 × 100 kΩ × 10 µF ≈ 1.1 s",
    "TRIG < VCC/3 starts; TRIG must return high ≥10 µs before timing ends",
    "RESET low overrides; OUT low; timing capacitor discharged",
    "ILED ≤ (5 − 1.6)/2.2 kΩ ≈ 1.55 mA"
  ],
  "schematic_height": 1085
}