{ "version": 2, "name": "Output Rack", "board": { "rows": 17, "cols": 16, "kind": "strip" }, "cuts": [ "7,7", "8,7", "9,7", "10,7", "12,7" ], "parts": [ { "kind": "diode", "value": "1N5817", "polarized": true, "device": "schottky", "mount": "vertical", "id": "op001", "ref": "D1", "pins": [ [ 1, 12 ], [ 0, 12 ] ] }, { "kind": "diode", "value": "1N5817", "polarized": true, "device": "schottky", "mount": "vertical", "id": "op002", "ref": "D2", "pins": [ [ 6, 12 ], [ 5, 12 ] ] }, { "id": "op003", "kind": "link", "ref": "J1", "pins": [ [ 2, 4 ], [ 3, 4 ] ] }, { "id": "op004", "kind": "link", "ref": "J2", "pins": [ [ 3, 9 ], [ 4, 9 ] ] }, { "kind": "ecap", "value": "10u", "polarized": true, "id": "op005", "ref": "C1", "pins": [ [ 0, 7 ], [ 2, 7 ] ] }, { "kind": "ecap", "value": "10u", "polarized": true, "id": "op006", "ref": "C2", "pins": [ [ 6, 7 ], [ 4, 7 ] ] }, { "id": "op007", "kind": "link", "ref": "J3", "pins": [ [ 0, 10 ], [ 7, 10 ] ] }, { "id": "op008", "kind": "link", "ref": "J4", "pins": [ [ 6, 3 ], [ 10, 3 ] ] }, { "id": "op009", "kind": "link", "ref": "J5", "pins": [ [ 7, 4 ], [ 8, 4 ] ] }, { "id": "op010", "kind": "link", "ref": "J6", "pins": [ [ 8, 11 ], [ 9, 11 ] ] }, { "id": "op011", "kind": "link", "ref": "J7", "pins": [ [ 9, 1 ], [ 12, 1 ] ] }, { "id": "op012", "kind": "link", "ref": "J8", "pins": [ [ 10, 13 ], [ 12, 13 ] ] }, { "id": "op013", "kind": "link", "ref": "J9", "pins": [ [ 4, 14 ], [ 13, 14 ] ] }, { "id": "op014", "kind": "link", "ref": "J10", "pins": [ [ 8, 15 ], [ 15, 15 ] ] }, { "kind": "res", "value": "100k", "device": "fixed", "mount": "vertical", "id": "op015", "ref": "R1", "pins": [ [ 11, 3 ], [ 12, 3 ] ] }, { "kind": "res", "value": "22k", "device": "fixed", "mount": "vertical", "id": "op016", "ref": "R2", "pins": [ [ 12, 5 ], [ 13, 5 ] ] }, { "kind": "res", "value": "1M", "device": "fixed", "mount": "vertical", "id": "op017", "ref": "R3", "pins": [ [ 12, 9 ], [ 13, 9 ] ] }, { "kind": "res", "value": "100k", "device": "fixed", "mount": "vertical", "id": "op018", "ref": "R4", "pins": [ [ 13, 11 ], [ 14, 11 ] ] }, { "kind": "res", "value": "470", "device": "fixed", "mount": "vertical", "id": "op019", "ref": "R5", "pins": [ [ 15, 9 ], [ 16, 9 ] ] }, { "kind": "cap", "value": "2u2", "device": "ceramic MLCC", "id": "op020", "ref": "C3", "pins": [ [ 14, 13 ], [ 16, 13 ] ] } ], "ics": [ { "id": "opic1", "ref": "IC1", "part": "TL072", "pins": 8, "pin1": [ 7, 6 ], "span": 3, "autoCuts": [ "7,7", "8,7", "9,7", "10,7" ] } ], "pads": [ { "id": "opp01", "label": "H1", "at": [ 5, 1 ], "to": "power header pin 1: -12 V. The cable's RED STRIPE is this end" }, { "id": "opp02", "label": "H2", "at": [ 5, 2 ], "to": "power header pin 2: -12 V. The cable's RED STRIPE is this end" }, { "id": "opp03", "label": "H3", "at": [ 4, 1 ], "to": "power header pin 3: ground" }, { "id": "opp04", "label": "H4", "at": [ 4, 2 ], "to": "power header pin 4: ground" }, { "id": "opp05", "label": "H5", "at": [ 3, 1 ], "to": "power header pin 5: ground" }, { "id": "opp06", "label": "H6", "at": [ 3, 2 ], "to": "power header pin 6: ground" }, { "id": "opp07", "label": "H7", "at": [ 2, 1 ], "to": "power header pin 7: ground" }, { "id": "opp08", "label": "H8", "at": [ 2, 2 ], "to": "power header pin 8: ground" }, { "id": "opp09", "label": "H9", "at": [ 1, 1 ], "to": "power header pin 9: +12 V" }, { "id": "opp10", "label": "H10", "at": [ 1, 2 ], "to": "power header pin 10: +12 V" }, { "id": "opp11", "label": "IN", "at": [ 11, 4 ], "to": "input jack tip, the rack signal", "parts": [ { "id": "JK1", "kind": "jack", "lug": "T", "value": "3.5 mm" } ] }, { "id": "opp12", "label": "VOL_HI", "at": [ 7, 2 ], "to": "volume pot lug 3 - the signal at x0.18, from op-amp A", "parts": [ { "id": "POT1", "kind": "pot", "lug": "3", "value": "A10K" } ] }, { "id": "opp13", "label": "VOL_W", "at": [ 12, 11 ], "to": "volume pot wiper, into op-amp B", "parts": [ { "id": "POT1", "kind": "pot", "lug": "W", "value": "A10K" } ] }, { "id": "opp14", "label": "GND_P", "at": [ 4, 15 ], "to": "ground for the panel: the volume pot lug 1, both jack sleeves", "parts": [ { "id": "POT1", "kind": "pot", "lug": "1", "value": "A10K" }, { "id": "JK1", "kind": "jack", "lug": "S", "value": "3.5 mm" }, { "id": "JK2", "kind": "jack", "lug": "S", "value": "3.5 mm" } ] }, { "id": "opp15", "label": "OUT", "at": [ 14, 4 ], "to": "output jack tip - DC-blocked, at most about 1.8 V peak to peak", "parts": [ { "id": "JK2", "kind": "jack", "lug": "T", "value": "3.5 mm" } ] } ], "netlist": "# Output Rack - written from the board\n# 17 strips of 16 holes, 20 parts, 1 chip, 5 cuts\n#\n# IN through a 100k / 22k divider into ATT, x0.18; op-amp A follows it\n# onto VOL_HI, the volume pot lug 3. Op-amp B follows the wiper, VOL_W,\n# with 1M to ground, and drives OUT through 470R and a 2u2 ceramic,\n# 100k to ground on the jack side. 2x5 power header H1-H10, red stripe\n# at H1/H2 on strip 5; a 1N5817 on each rail. No regulator.\n\n-12_RAW: @H1 @H2 D2.B\n-12: D2.A C2.A IC1.4 J4.A J4.B\n+12_RAW: @H9 @H10 D1.A\n+12: D1.B C1.A IC1.8 J3.A J3.B\nGND: @H3 @H4 @H5 @H6 @H7 @H8 J1.A J1.B J2.A J2.B C1.B C2.B J9.A J9.B R2.B R3.B R4.A @GND_P\nIN: R1.A @IN\nATT: IC1.3 J7.A J7.B R1.B R2.A\nVOL_HI: IC1.1 IC1.2 J5.A J5.B @VOL_HI\nVOL_W: IC1.5 J8.A J8.B R3.A @VOL_W\nOUT_B: IC1.6 IC1.7 J6.A J6.B J10.A J10.B R5.A\nDC_IN: R5.B C3.B\nOUT: R4.B C3.A @OUT\n" }