{
  "schema_version": 1,
  "id": "lm386-receiver-audio",
  "revision": 1,
  "status": "documented_design_for_prototyping",
  "measured": false,
  "spice_simulated": false,
  "fabrication_released": false,
  "device": "LM386N-1",
  "package": "PDIP8",
  "supply_v": 6,
  "gain_v_per_v_nominal": 20,
  "speaker_nominal_ohms": 8,
  "test_load_ohms": 8.2,
  "test_load_rating_w_min": 1,
  "initial_current_limit_a": 0.05,
  "small_signal_current_limit_a": 0.2,
  "idle_current_stop_a": 0.02,
  "maximum_protocol_output_rms_v": 1,
  "idle_vout_stop_window_v": [2, 4],
  "nodes": ["AUDIO_IN", "POT_TOP", "VIN", "VS_IN", "VS", "GND", "VOUT", "OUT_AC", "ZOBEL_MID", "BYPASS", "GAIN1_OPEN", "GAIN8_OPEN"],
  "test_points": {"TP0": "GND", "TP1": "VS", "TP2": "VIN", "TP3": "VOUT", "TP4": "OUT_AC"},
  "components": [
    {"ref":"U1","quantity":1,"type":"ic","value":"LM386N-1","spec_key":"bom_u1","pins":{"1":"GAIN1_OPEN","2":"GND","3":"VIN","4":"GND","5":"VOUT","6":"VS","7":"BYPASS","8":"GAIN8_OPEN"}},
    {"ref":"RV1","quantity":1,"type":"potentiometer","value":"10 kΩ","resistance_ohms":10000,"spec_key":"bom_rv1","pins":{"CW":"POT_TOP","WIPER":"VIN","CCW":"GND"}},
    {"ref":"C1","quantity":1,"type":"capacitor_film","value":"1 µF","capacitance_f":0.000001,"rating_v_min":16,"spec_key":"bom_c1","pins":{"1":"AUDIO_IN","2":"POT_TOP"}},
    {"ref":"C2","quantity":1,"type":"capacitor_electrolytic","value":"220 µF","capacitance_f":0.00022,"rating_v_min":16,"positive_net":"VOUT","spec_key":"bom_c2","pins":{"+":"VOUT","-":"OUT_AC"}},
    {"ref":"C3","quantity":1,"type":"capacitor","value":"47 nF","capacitance_f":4.7e-8,"rating_v_min":16,"spec_key":"bom_c3","pins":{"1":"ZOBEL_MID","2":"GND"}},
    {"ref":"C4","quantity":1,"type":"capacitor_ceramic","value":"100 nF","capacitance_f":1e-7,"rating_v_min":16,"spec_key":"bom_c4","pins":{"1":"VS","2":"GND"}},
    {"ref":"C5","quantity":1,"type":"capacitor_electrolytic","value":"100 µF","capacitance_f":0.0001,"rating_v_min":16,"positive_net":"VS","spec_key":"bom_c5","pins":{"+":"VS","-":"GND"}},
    {"ref":"C6","quantity":1,"type":"capacitor_electrolytic","value":"10 µF","capacitance_f":0.00001,"rating_v_min":16,"positive_net":"BYPASS","spec_key":"bom_c6","pins":{"+":"BYPASS","-":"GND"}},
    {"ref":"R1","quantity":1,"type":"resistor","value":"10 Ω","resistance_ohms":10,"rating_w_min":0.25,"spec_key":"bom_r1","pins":{"1":"VOUT","2":"ZOBEL_MID"}},
    {"ref":"J1","quantity":1,"type":"connector","value":"2P","spec_key":"bom_j1","pins":{"1":"AUDIO_IN","2":"GND"}},
    {"ref":"J2","quantity":1,"type":"connector","value":"2P · 6 V","spec_key":"bom_j2","pins":{"1":"VS_IN","2":"GND"}},
    {"ref":"S1","quantity":1,"type":"switch_spst","value":"SPST · ≥0.5 A / 12 V DC","spec_key":"bom_switch","pins":{"1":"VS_IN","2":"VS"}},
    {"ref":"J3","quantity":1,"type":"connector","value":"2P","spec_key":"bom_j3","pins":{"1":"OUT_AC","2":"GND"}},
    {"ref":"SP1","quantity":1,"type":"speaker","value":"8 Ω · ≥1 W","nominal_impedance_ohms":8,"rating_w_min":1,"spec_key":"bom_sp1","pins":{"1":"OUT_AC","2":"GND"}}
  ],
  "accessories": [
    {"ref":"RTEST","quantity":1,"value":"8.2 Ω · ≥1 W","spec_key":"bom_test","connected_in_reference":false,"replaces":"SP1"},
    {"ref":"SK1/BOARD1","quantity":1,"value":"PDIP8","spec_key":"bom_socket","connected_in_reference":false},
    {"ref":"PS1","quantity":1,"value":"6 V · 50/200 mA","spec_key":"bom_supply","external_equipment":true,"required_for_tests":true},
    {"ref":"WIRE1","quantity":1,"value":"GND / VIN / VS / OUT_AC","spec_key":"bom_wires","external_equipment":true},
    {"ref":"TEST1","quantity":1,"value":"1 kHz","spec_key":"bom_instruments","external_equipment":true,"required_for_tests":true}
  ],
  "calculation_assumptions": {"source_resistance_ohms":0,"amplifier_input_resistance_ohms_typical":50000,"volume_position":"maximum","test_frequency_hz":1000,"example_vin_rms_v":0.02,"example_vout_rms_v":0.4,"alternative_input_capacitance_f":1e-7},
  "sources": [
    {"title":"Texas Instruments LM386 · SNAS545D · Rev. D · 2023-08","url":"https://www.ti.com/lit/ds/symlink/lm386.pdf","consulted":"2026-11-08","sections":["5","6.3","6.5","9.2.1","10","11"]},
    {"title":"Texas Instruments · Guidelines for Measuring Audio Power Amplifier Performance · SLOA068A","url":"https://www.ti.com/lit/pdf/SLOA068","consulted":"2026-11-08"}
  ],
  "datasheet_adaptations": {"ti_output_capacitance_f":0.00025,"project_output_capacitance_f":0.00022,"ti_stability_capacitance_f":5e-8,"project_stability_capacitance_f":4.7e-8,"project_values_require_prototype_stability_checks":true},
  "comic_continuity": [119,120]
}