(kicad_sch
  (version 20231120)
  (generator "eeschema")
  (generator_version "8.0")
  (uuid "cams1-amp-mid-0002")
  (paper "A3")
  (title_block
    (title "CAMS-1 — MID Power Amp (LM3886TF) G=21")
    (date "2026-08-28")
    (rev "A")
    (comment 1 "Identical topology to lm3886-poweramp — church mid driver channel")
    (comment 2 "VERIFY LM3886TF pinout / mute against TI datasheet before PCB")
  )

  (lib_symbols
    (symbol "Device:R"
      (property "Reference" "R" (at 2.032 0 90) (effects (font (size 1.27 1.27))))
      (property "Value" "R" (at 0 0 90) (effects (font (size 1.27 1.27))))
      (symbol "R_0_1" (rectangle (start -1.016 -2.54) (end 1.016 2.54) (stroke (width 0.254) (type default)) (fill (type none))))
      (symbol "R_1_1"
        (pin passive line (at 0 3.81 270) (length 1.27) (name "~" (effects (font (size 1.27 1.27)))) (number "1" (effects (font (size 1.27 1.27)))))
        (pin passive line (at 0 -3.81 90) (length 1.27) (name "~" (effects (font (size 1.27 1.27)))) (number "2" (effects (font (size 1.27 1.27))))))
    )
    (symbol "Device:C"
      (property "Reference" "C" (at 0.635 2.54 0) (effects (font (size 1.27 1.27))))
      (property "Value" "C" (at 0.635 -2.54 0) (effects (font (size 1.27 1.27))))
      (symbol "C_0_1"
        (polyline (pts (xy -2.032 -0.762) (xy 2.032 -0.762)) (stroke (width 0.508) (type default)) (fill (type none)))
        (polyline (pts (xy -2.032 0.762) (xy 2.032 0.762)) (stroke (width 0.508) (type default)) (fill (type none))))
      (symbol "C_1_1"
        (pin passive line (at 0 3.81 270) (length 2.794) (name "~" (effects (font (size 1.27 1.27)))) (number "1" (effects (font (size 1.27 1.27)))))
        (pin passive line (at 0 -3.81 90) (length 2.794) (name "~" (effects (font (size 1.27 1.27)))) (number "2" (effects (font (size 1.27 1.27))))))
    )
    (symbol "Device:L"
      (property "Reference" "L" (at -1.27 0 90) (effects (font (size 1.27 1.27))))
      (property "Value" "L" (at 1.905 0 90) (effects (font (size 1.27 1.27))))
      (symbol "L_0_1"
        (arc (start 0 2.54) (mid 0.5528 1.27) (end 0 0) (stroke (width 0) (type default)) (fill (type none)))
        (arc (start 0 0) (mid 0.5528 -1.27) (end 0 -2.54) (stroke (width 0) (type default)) (fill (type none))))
      (symbol "L_1_1"
        (pin passive line (at 0 3.81 270) (length 1.27) (name "~" (effects (font (size 1.27 1.27)))) (number "1" (effects (font (size 1.27 1.27)))))
        (pin passive line (at 0 -3.81 90) (length 1.27) (name "~" (effects (font (size 1.27 1.27)))) (number "2" (effects (font (size 1.27 1.27))))))
    )
    (symbol "Amplifier_Audio:LM3886"
      (property "Reference" "U" (at 0 12.7 0) (effects (font (size 1.27 1.27))))
      (property "Value" "LM3886TF" (at 0 -12.7 0) (effects (font (size 1.27 1.27))))
      (property "Footprint" "Package_TO_SOT_THT:TO-220-11_P3.4x3.7mm_StaggerOdd" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
      (property "Datasheet" "https://www.ti.com/lit/ds/symlink/lm3886.pdf" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
      (symbol "LM3886_0_1" (rectangle (start -10.16 10.16) (end 10.16 -10.16) (stroke (width 0.254) (type default)) (fill (type background))))
      (symbol "LM3886_1_1"
        (pin input line (at -12.7 5.08 0) (length 2.54) (name "+" (effects (font (size 1.27 1.27)))) (number "8" (effects (font (size 1.27 1.27)))))
        (pin input line (at -12.7 -2.54 0) (length 2.54) (name "-" (effects (font (size 1.27 1.27)))) (number "9" (effects (font (size 1.27 1.27)))))
        (pin output line (at 12.7 2.54 180) (length 2.54) (name "OUT" (effects (font (size 1.27 1.27)))) (number "3" (effects (font (size 1.27 1.27)))))
        (pin power_in line (at 0 12.7 270) (length 2.54) (name "V+" (effects (font (size 1.27 1.27)))) (number "1" (effects (font (size 1.27 1.27)))))
        (pin power_in line (at 0 -12.7 90) (length 2.54) (name "V-" (effects (font (size 1.27 1.27)))) (number "4" (effects (font (size 1.27 1.27)))))
        (pin input line (at -12.7 -7.62 0) (length 2.54) (name "MUTE" (effects (font (size 1.27 1.27)))) (number "6" (effects (font (size 1.27 1.27)))))
        (pin passive line (at 12.7 -5.08 180) (length 2.54) (name "GND" (effects (font (size 1.27 1.27)))) (number "7" (effects (font (size 1.27 1.27))))))
    )
    (symbol "power:GND" (power)
      (property "Reference" "#PWR" (at 0 -6.35 0) (effects (font (size 1.27 1.27)) hide))
      (property "Value" "GND" (at 0 -3.81 0) (effects (font (size 1.27 1.27))))
      (symbol "GND_0_1" (polyline (pts (xy 0 0) (xy 0 -1.27) (xy 1.27 -1.27) (xy 0 -2.54) (xy -1.27 -1.27) (xy 0 -1.27)) (stroke (width 0) (type default)) (fill (type none))))
      (symbol "GND_1_1" (pin power_in line (at 0 0 270) (length 0) hide (name "~" (effects (font (size 1.27 1.27)))) (number "1" (effects (font (size 1.27 1.27))))))
    )
  )

  (hierarchical_label "IN" (shape input) (at 25.4 63.5 180)
    (effects (font (size 1.27 1.27)) (justify right)) (uuid "hl_in"))
  (hierarchical_label "SPK_MID" (shape output) (at 215.9 63.5 0)
    (effects (font (size 1.27 1.27)) (justify left)) (uuid "hl_out"))
  (hierarchical_label "+25V" (shape input) (at 127 35.56 90)
    (effects (font (size 1.27 1.27)) (justify left)) (uuid "hl_p"))
  (hierarchical_label "-25V" (shape input) (at 127 96.52 270)
    (effects (font (size 1.27 1.27)) (justify left)) (uuid "hl_n"))
  (hierarchical_label "GND" (shape input) (at 50.8 110.0 270)
    (effects (font (size 1.27 1.27)) (justify left)) (uuid "hl_g"))

  (symbol (lib_id "Device:C") (at 40.64 63.5 90) (unit 1)
    (uuid "cin") (property "Reference" "Cin_M" (at 40.64 58.42 90) (effects (font (size 1.27 1.27))))
    (property "Value" "1uF" (at 40.64 68.58 90) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "cina")) (pin "2" (uuid "cinb")))
  (symbol (lib_id "Device:R") (at 60.96 63.5 90) (unit 1)
    (uuid "rin") (property "Reference" "Rin_M" (at 60.96 58.42 90) (effects (font (size 1.27 1.27))))
    (property "Value" "1k" (at 60.96 68.58 90) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "rina")) (pin "2" (uuid "rinb")))
  (symbol (lib_id "Device:R") (at 76.2 80.01 0) (unit 1)
    (uuid "rb") (property "Reference" "Rbias_M" (at 82 78.74 0) (effects (font (size 1.27 1.27))))
    (property "Value" "1M" (at 82 81.28 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "rba")) (pin "2" (uuid "rbb")))
  (symbol (lib_id "power:GND") (at 76.2 83.82 0) (unit 1)
    (uuid "g1") (property "Reference" "#PWRM1" (at 76.2 83.82 0) (effects (font (size 1.27 1.27)) hide))
    (property "Value" "GND" (at 76.2 87.63 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "g1p")))
  (symbol (lib_id "Amplifier_Audio:LM3886") (at 127 66.04 0) (unit 1)
    (uuid "u1") (property "Reference" "U1" (at 127 50.8 0) (effects (font (size 1.27 1.27))))
    (property "Value" "LM3886TF" (at 127 81.28 0) (effects (font (size 1.27 1.27))))
    (pin "8" (uuid "u1a")) (pin "9" (uuid "u1b")) (pin "3" (uuid "u1c"))
    (pin "1" (uuid "u1d")) (pin "4" (uuid "u1e")) (pin "6" (uuid "u1f")) (pin "7" (uuid "u1g")))
  (symbol (lib_id "Device:R") (at 101.6 88.9 90) (unit 1)
    (uuid "rf") (property "Reference" "Rf_M" (at 101.6 83.82 90) (effects (font (size 1.27 1.27))))
    (property "Value" "20k" (at 101.6 93.98 90) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "rfa")) (pin "2" (uuid "rfb")))
  (symbol (lib_id "Device:C") (at 114.3 88.9 90) (unit 1)
    (uuid "cf") (property "Reference" "Cf_M" (at 114.3 83.82 90) (effects (font (size 1.27 1.27))))
    (property "Value" "20pF" (at 114.3 93.98 90) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "cfa")) (pin "2" (uuid "cfb")))
  (symbol (lib_id "Device:R") (at 101.6 104.14 0) (unit 1)
    (uuid "ri") (property "Reference" "Ri_M" (at 106 102.87 0) (effects (font (size 1.27 1.27))))
    (property "Value" "1k" (at 106 105.41 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "ria")) (pin "2" (uuid "rib")))
  (symbol (lib_id "Device:C") (at 101.6 111.76 0) (unit 1)
    (uuid "ci") (property "Reference" "Ci_M" (at 106 110.49 0) (effects (font (size 1.27 1.27))))
    (property "Value" "220uF" (at 106 113.03 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "cia")) (pin "2" (uuid "cib")))
  (symbol (lib_id "power:GND") (at 101.6 115.57 0) (unit 1)
    (uuid "g2") (property "Reference" "#PWRM2" (at 101.6 115.57 0) (effects (font (size 1.27 1.27)) hide))
    (property "Value" "GND" (at 101.6 119.38 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "g2p")))
  (symbol (lib_id "Device:R") (at 152.4 80.01 0) (unit 1)
    (uuid "rz") (property "Reference" "Rz_M" (at 157 78.74 0) (effects (font (size 1.27 1.27))))
    (property "Value" "10R" (at 157 81.28 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "rza")) (pin "2" (uuid "rzb")))
  (symbol (lib_id "Device:C") (at 152.4 88.9 0) (unit 1)
    (uuid "cz") (property "Reference" "Cz_M" (at 157 87.63 0) (effects (font (size 1.27 1.27))))
    (property "Value" "0.1uF" (at 157 90.17 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "cza")) (pin "2" (uuid "czb")))
  (symbol (lib_id "power:GND") (at 152.4 92.71 0) (unit 1)
    (uuid "g3") (property "Reference" "#PWRM3" (at 152.4 92.71 0) (effects (font (size 1.27 1.27)) hide))
    (property "Value" "GND" (at 152.4 96.52 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "g3p")))
  (symbol (lib_id "Device:L") (at 177.8 63.5 90) (unit 1)
    (uuid "lo") (property "Reference" "Lout_M" (at 177.8 58.42 90) (effects (font (size 1.27 1.27))))
    (property "Value" "0.68uH" (at 177.8 68.58 90) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "loa")) (pin "2" (uuid "lob")))
  (symbol (lib_id "Device:R") (at 190.5 76.2 0) (unit 1)
    (uuid "rl") (property "Reference" "RLp_M" (at 196 74.93 0) (effects (font (size 1.27 1.27))))
    (property "Value" "10R" (at 196 77.47 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "rla")) (pin "2" (uuid "rlb")))
  (symbol (lib_id "Device:R") (at 114.3 104.14 90) (unit 1)
    (uuid "rm") (property "Reference" "Rmute_M" (at 114.3 99.06 90) (effects (font (size 1.27 1.27))))
    (property "Value" "100k" (at 114.3 109.22 90) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "rma")) (pin "2" (uuid "rmb")))
  (symbol (lib_id "Device:C") (at 127 111.76 0) (unit 1)
    (uuid "cm") (property "Reference" "Cmute_M" (at 133 110.49 0) (effects (font (size 1.27 1.27))))
    (property "Value" "10uF" (at 133 113.03 0) (effects (font (size 1.27 1.27))))
    (pin "1" (uuid "cma")) (pin "2" (uuid "cmb")))

  (text "WHY Ci: DC gain=1 reduces speaker offset | WHY Zobel: resistive HF load | WHY L||R: cable stability"
    (exclude_from_sim no) (at 25.4 25.4 0)
    (effects (font (size 1.27 1.27)) (justify left bottom)) (uuid "tn"))
  (text "PCB: place 100nF within 5mm of V+/V- pins; star GND to bulk caps; heatsink outside cabinet"
    (exclude_from_sim no) (at 25.4 27.94 0)
    (effects (font (size 1.27 1.27)) (justify left bottom)) (uuid "tn2"))

  (label "N_PLUS" (at 76.2 62.23 0) (effects (font (size 1.27 1.27)) (justify left bottom)) (uuid "lp"))
  (label "N_MINUS" (at 101.6 87.63 0) (effects (font (size 1.27 1.27)) (justify left bottom)) (uuid "lm"))
  (label "AMP_OUT" (at 152.4 62.23 0) (effects (font (size 1.27 1.27)) (justify left bottom)) (uuid "la"))

  (sheet_instances (path "/" (page "MID")))
)