{ "version": 2, "name": "Bridged Amp", "board": { "rows": 12, "cols": 30, "kind": "strip" }, "cuts": [ "4,5", "5,5", "6,5", "7,5", "4,19", "5,19", "6,19", "7,19", "4,14", "5,14", "6,14", "7,14", "8,14", "10,14", "11,14", "8,5", "8,19", "1,27" ], "parts": [ { "id": "ba01amp", "kind": "link", "ref": "J1", "pins": [ [ 4, 9 ], [ 8, 9 ] ] }, { "id": "ba02amp", "kind": "link", "ref": "J2", "pins": [ [ 5, 3 ], [ 7, 3 ] ] }, { "id": "ba03amp", "kind": "link", "ref": "J3", "pins": [ [ 7, 2 ], [ 9, 2 ] ] }, { "id": "ba04amp", "kind": "link", "ref": "J4", "pins": [ [ 1, 11 ], [ 6, 11 ] ] }, { "id": "ba05amp", "kind": "link", "ref": "J5", "pins": [ [ 2, 12 ], [ 9, 12 ] ] }, { "id": "ba06amp", "kind": "link", "ref": "J6", "pins": [ [ 4, 23 ], [ 8, 23 ] ] }, { "id": "ba07amp", "kind": "link", "ref": "J7", "pins": [ [ 6, 17 ], [ 7, 17 ] ] }, { "id": "ba08amp", "kind": "link", "ref": "J8", "pins": [ [ 7, 16 ], [ 9, 16 ] ] }, { "id": "ba09amp", "kind": "link", "ref": "J9", "pins": [ [ 1, 24 ], [ 6, 24 ] ] }, { "id": "ba10amp", "kind": "link", "ref": "J10", "pins": [ [ 7, 25 ], [ 11, 25 ] ] }, { "id": "ba11amp", "kind": "res", "ref": "R1", "value": "1k2", "pins": [ [ 8, 3 ], [ 8, 7 ] ], "device": "fixed" }, { "id": "ba12amp", "kind": "res", "ref": "R2", "value": "10R", "pins": [ [ 7, 8 ], [ 10, 8 ] ], "device": "fixed" }, { "id": "ba13amp", "kind": "res", "ref": "R3", "value": "2k2", "pins": [ [ 1, 10 ], [ 0, 10 ] ], "device": "fixed", "mount": "vertical" }, { "id": "ba14amp", "kind": "res", "ref": "R4", "value": "1k2", "pins": [ [ 8, 17 ], [ 8, 21 ] ], "device": "fixed" }, { "id": "ba15amp", "kind": "res", "ref": "R5", "value": "10R", "pins": [ [ 7, 22 ], [ 10, 22 ] ], "device": "fixed" }, { "id": "ba16amp", "kind": "cap", "ref": "C1", "value": "100n", "pins": [ [ 3, 2 ], [ 6, 2 ] ], "device": "ceramic disc" }, { "id": "ba17amp", "kind": "ecap", "ref": "C2", "value": "10u", "pins": [ [ 4, 1 ], [ 8, 1 ] ], "polarized": true }, { "id": "ba18amp", "kind": "ecap", "ref": "C3", "value": "10u", "pins": [ [ 5, 10 ], [ 9, 10 ] ], "polarized": true }, { "id": "ba19amp", "kind": "cap", "ref": "C4", "value": "47n", "pins": [ [ 10, 6 ], [ 9, 6 ] ], "device": "ceramic disc" }, { "id": "ba20amp", "kind": "cap", "ref": "C5", "value": "100n", "pins": [ [ 3, 16 ], [ 5, 16 ] ], "device": "ceramic disc" }, { "id": "ba21amp", "kind": "ecap", "ref": "C6", "value": "10u", "pins": [ [ 4, 15 ], [ 8, 15 ] ], "polarized": true }, { "id": "ba22amp", "kind": "ecap", "ref": "C7", "value": "10u", "pins": [ [ 5, 26 ], [ 9, 26 ] ], "polarized": true }, { "id": "ba23amp", "kind": "cap", "ref": "C8", "value": "47n", "pins": [ [ 10, 20 ], [ 9, 20 ] ], "device": "ceramic disc" }, { "id": "ba24amp", "kind": "ecap", "ref": "C9", "value": "470u", "pins": [ [ 7, 11 ], [ 11, 11 ] ], "polarized": true }, { "id": "ba25amp", "kind": "ecap", "ref": "C10", "value": "220u", "pins": [ [ 1, 0 ], [ 2, 0 ] ], "polarized": true }, { "id": "ba26amp", "kind": "cap", "ref": "C11", "value": "100n", "pins": [ [ 1, 3 ], [ 2, 3 ] ], "device": "ceramic disc" }, { "id": "ba27amp", "kind": "diode", "ref": "D1", "value": "1N5817", "pins": [ [ 1, 28 ], [ 1, 25 ] ], "polarized": true, "device": "schottky" } ], "ics": [ { "id": "baic1", "ref": "IC1", "part": "LM386", "pins": 8, "pin1": [ 4, 4 ], "span": 3, "autoCuts": [ "4,5", "5,5", "6,5", "7,5" ] }, { "id": "baic2", "ref": "IC2", "part": "LM386", "pins": 8, "pin1": [ 4, 18 ], "span": 3, "autoCuts": [ "4,19", "5,19", "6,19", "7,19" ] } ], "pads": [ { "id": "bap01", "label": "9V", "at": [ 1, 29 ], "to": "DC jack tip or battery +, 9 to 12 V, center positive, through the power toggle. 12 V is the LM386's limit" }, { "id": "bap02", "label": "+V", "at": [ 1, 12 ], "to": "test point on the protected rail; nothing leaves the board here. It also tells the checker this strip is a supply" }, { "id": "bap03", "label": "GND", "at": [ 2, 29 ], "to": "ground: battery -, input jack sleeve, volume pot lug 3. NOT the speaker jack" }, { "id": "bap04", "label": "IN", "at": [ 3, 0 ], "to": "volume pot wiper. Lug 1 to the input jack tip, lug 3 to GND" }, { "id": "bap05", "label": "LED+", "at": [ 0, 12 ], "to": "power LED anode" }, { "id": "bap06", "label": "LED-", "at": [ 2, 9 ], "to": "power LED cathode" }, { "id": "bap07", "label": "SPK+", "at": [ 11, 13 ], "to": "speaker, one terminal - through C9 from chip A" }, { "id": "bap08", "label": "SPK-", "at": [ 11, 29 ], "to": "speaker, other terminal - chip B's output. NOT ground: the jack must be insulated from the box" } ], "netlist": "# Bridged Amp - written from the board\n# 12 strips of 30 holes, 27 parts, 2 chips, 18 cuts\n#\n# Two LM386s, A fed on pin 3 and B on pin 2, so B swings the other way.\n# The speaker sits between A_OUT (through C9) and B_OUT - neither end is\n# ground, so the speaker jack must be insulated from the box.\n\n9V: @9V D1.A\n+V: D1.B R3.A C10.A C11.A IC1.6 IC2.6 @+V J4.A J4.B J9.A J9.B\nGND: @GND C3.B C4.B C7.B C8.B C10.B C11.B IC1.2 IC1.4 IC2.3 IC2.4 @LED- J2.A J2.B J3.A J3.B J5.A J5.B J7.A J7.B J8.A J8.B\nIN: @IN C1.A C5.A\nA_IN: C1.B IC1.3\nB_IN: C5.B IC2.2\nA_GAIN1: IC1.1 C2.A\nA_GAINR: C2.B R1.A\nA_GAIN8: R1.B IC1.8 J1.A J1.B\nB_GAIN1: IC2.1 C6.A\nB_GAINR: C6.B R4.A\nB_GAIN8: R4.B IC2.8 J6.A J6.B\nA_BYP: IC1.7 C3.A\nB_BYP: IC2.7 C7.A\nA_OUT: IC1.5 R2.A C9.A\nA_ZOBEL: R2.B C4.A\nB_OUT: IC2.5 R5.A @SPK- J10.A J10.B\nB_ZOBEL: R5.B C8.A\nSPK+: C9.B @SPK+\nLED: R3.B @LED+\n" }