{ "version": 2, "name": "LFO Rack", "board": { "rows": 20, "cols": 23, "kind": "strip" }, "cuts": [ "0,4", "1,4", "2,4", "3,4", "4,4", "5,4", "6,4", "7,8", "8,8", "9,8", "10,8", "11,8", "12,8", "13,8", "15,8", "16,8", "17,8", "18,8", "19,8" ], "parts": [ { "kind": "diode", "value": "1N5817", "polarized": true, "device": "schottky", "mount": "vertical", "id": "lr001", "ref": "D1", "pins": [ [ 5, 11 ], [ 6, 11 ] ] }, { "kind": "diode", "value": "1N5817", "polarized": true, "device": "schottky", "mount": "vertical", "id": "lr002", "ref": "D2", "pins": [ [ 0, 11 ], [ 1, 11 ] ] }, { "id": "lr003", "kind": "link", "ref": "J1", "pins": [ [ 2, 12 ], [ 3, 12 ] ] }, { "id": "lr004", "kind": "link", "ref": "J1b", "pins": [ [ 3, 14 ], [ 4, 14 ] ] }, { "kind": "ecap", "value": "10u", "polarized": true, "id": "lr005", "ref": "C5", "pins": [ [ 6, 17 ], [ 4, 17 ] ] }, { "kind": "ecap", "value": "10u", "polarized": true, "id": "lr006", "ref": "C6", "pins": [ [ 0, 17 ], [ 2, 17 ] ] }, { "kind": "cap", "value": "100n", "device": "ceramic disc", "id": "lr007", "ref": "C7", "pins": [ [ 6, 15 ], [ 4, 15 ] ] }, { "kind": "cap", "value": "100n", "device": "ceramic disc", "id": "lr008", "ref": "C8", "pins": [ [ 0, 15 ], [ 2, 15 ] ] }, { "id": "lr009", "kind": "link", "ref": "J2", "pins": [ [ 11, 5 ], [ 4, 5 ] ] }, { "id": "lr010", "kind": "link", "ref": "J3", "pins": [ [ 10, 6 ], [ 6, 6 ] ] }, { "id": "lr011", "kind": "link", "ref": "J4", "pins": [ [ 13, 6 ], [ 14, 6 ] ] }, { "id": "lr012", "kind": "link", "ref": "J5", "pins": [ [ 12, 0 ], [ 15, 0 ] ] }, { "id": "lr013", "kind": "link", "ref": "J6", "pins": [ [ 10, 18 ], [ 0, 18 ] ] }, { "id": "lr014", "kind": "link", "ref": "J7", "pins": [ [ 12, 16 ], [ 9, 16 ] ] }, { "id": "lr015", "kind": "link", "ref": "J8", "pins": [ [ 9, 13 ], [ 4, 13 ] ] }, { "id": "lr016", "kind": "link", "ref": "J9", "pins": [ [ 7, 17 ], [ 15, 17 ] ] }, { "id": "lr017", "kind": "link", "ref": "J10", "pins": [ [ 12, 20 ], [ 17, 20 ] ] }, { "id": "lr018", "kind": "link", "ref": "J11", "pins": [ [ 11, 14 ], [ 19, 14 ] ] }, { "kind": "cap", "value": "1u", "device": "box film", "id": "lr019", "ref": "C1", "pins": [ [ 13, 3 ], [ 15, 3 ] ] }, { "kind": "res", "value": "47k", "device": "fixed", "id": "lr020", "ref": "R1", "pins": [ [ 18, 4 ], [ 15, 4 ] ] }, { "kind": "res", "value": "47k", "device": "fixed", "id": "lr021", "ref": "R2", "pins": [ [ 14, 15 ], [ 19, 15 ] ] }, { "kind": "res", "value": "100k", "device": "fixed", "id": "lr022", "ref": "R5", "pins": [ [ 13, 11 ], [ 19, 11 ] ] }, { "kind": "ecap", "value": "10u NP", "polarized": true, "id": "lr023", "ref": "C4", "pins": [ [ 15, 1 ], [ 16, 1 ] ] }, { "kind": "res", "value": "100k", "device": "fixed", "id": "lr024", "ref": "R13", "pins": [ [ 13, 12 ], [ 8, 12 ] ] }, { "kind": "res", "value": "47k", "device": "fixed", "mount": "vertical", "id": "lr025", "ref": "R14", "pins": [ [ 7, 14 ], [ 8, 14 ] ] }, { "kind": "res", "value": "1k", "device": "fixed", "mount": "vertical", "id": "lr026", "ref": "R8", "pins": [ [ 15, 18 ], [ 16, 18 ] ] }, { "kind": "res", "value": "1k", "device": "fixed", "id": "lr027", "ref": "R9", "pins": [ [ 15, 19 ], [ 18, 19 ] ] }, { "kind": "diode", "value": "1N4148", "polarized": true, "device": "switching", "mount": "vertical", "id": "lr028", "ref": "D3", "pins": [ [ 17, 21 ], [ 18, 21 ] ] }, { "kind": "res", "value": "22k", "device": "fixed", "id": "lr029", "ref": "R10", "pins": [ [ 13, 4 ], [ 9, 4 ] ] }, { "kind": "diode", "value": "1N4148", "polarized": true, "device": "switching", "id": "lr030", "ref": "D4", "pins": [ [ 9, 3 ], [ 11, 3 ] ] }, { "kind": "diode", "value": "1N4148", "polarized": true, "device": "switching", "id": "lr031", "ref": "D5", "pins": [ [ 11, 2 ], [ 9, 2 ] ] }, { "kind": "res", "value": "10k", "device": "fixed", "id": "lr032", "ref": "R11", "pins": [ [ 8, 1 ], [ 11, 1 ] ] }, { "kind": "res", "value": "68k", "device": "fixed", "mount": "vertical", "id": "lr033", "ref": "R12", "pins": [ [ 7, 3 ], [ 8, 3 ] ] }, { "kind": "res", "value": "1k", "device": "fixed", "mount": "vertical", "id": "lr034", "ref": "R15", "pins": [ [ 7, 0 ], [ 6, 0 ] ] }, { "kind": "res", "value": "1k", "device": "fixed", "id": "lr035", "ref": "R6", "pins": [ [ 14, 5 ], [ 17, 5 ] ] } ], "ics": [ { "id": "lric1", "ref": "IC1", "part": "TL074", "pins": 14, "pin1": [ 7, 7 ], "span": 3, "autoCuts": [ "7,8", "8,8", "9,8", "10,8", "11,8", "12,8", "13,8" ] } ], "pads": [ { "id": "lrp01", "label": "H1", "at": [ 1, 20 ], "to": "power header pin 1: -12 V. The cable's RED STRIPE is this end" }, { "id": "lrp02", "label": "H2", "at": [ 1, 21 ], "to": "power header pin 2: -12 V. The cable's RED STRIPE is this end" }, { "id": "lrp03", "label": "H3", "at": [ 2, 20 ], "to": "power header pin 3: ground" }, { "id": "lrp04", "label": "H4", "at": [ 2, 21 ], "to": "power header pin 4: ground" }, { "id": "lrp05", "label": "H5", "at": [ 3, 20 ], "to": "power header pin 5: ground" }, { "id": "lrp06", "label": "H6", "at": [ 3, 21 ], "to": "power header pin 6: ground" }, { "id": "lrp07", "label": "H7", "at": [ 4, 20 ], "to": "power header pin 7: ground" }, { "id": "lrp08", "label": "H8", "at": [ 4, 21 ], "to": "power header pin 8: ground" }, { "id": "lrp09", "label": "H9", "at": [ 5, 20 ], "to": "power header pin 9: +12 V" }, { "id": "lrp10", "label": "H10", "at": [ 5, 21 ], "to": "power header pin 10: +12 V" }, { "id": "lrp11", "label": "TRI", "at": [ 13, 2 ], "to": "the triangle. RANGE toggle, one side: closed, C4 sits across C1 and the sweep is ten times slower", "parts": [ { "id": "SW1", "kind": "toggle", "lug": "1", "value": "SPST", "role": "range" } ] }, { "id": "lrp12", "label": "RANGE_C", "at": [ 16, 0 ], "to": "RANGE toggle, other side: C4's free leg", "parts": [ { "id": "SW1", "kind": "toggle", "lug": "C", "value": "SPST", "role": "range" } ] }, { "id": "lrp13", "label": "RATE_W", "at": [ 18, 0 ], "to": "RATE pot wiper", "parts": [ { "id": "POT1", "kind": "pot", "lug": "W", "value": "B1M", "role": "rate" } ] }, { "id": "lrp14", "label": "SQ", "at": [ 13, 22 ], "to": "the square, raw, about +/-10 V. RATE pot lug 3 - the hot end of the variable resistor. Not a jack", "parts": [ { "id": "POT1", "kind": "pot", "lug": "3", "value": "B1M", "role": "rate" } ] }, { "id": "lrp15", "label": "TRI_J", "at": [ 17, 0 ], "to": "TRI jack tip - the triangle through 1k, about +/-5 V", "parts": [ { "id": "JK1", "kind": "jack", "lug": "T", "value": "3.5 mm", "role": "triangle out" } ] }, { "id": "lrp16", "label": "SINE_J", "at": [ 6, 2 ], "to": "SINE jack tip - through 1k, about +/-4.7 V", "parts": [ { "id": "JK2", "kind": "jack", "lug": "T", "value": "3.5 mm", "role": "sine out" } ] }, { "id": "lrp17", "label": "SQ_J", "at": [ 16, 22 ], "to": "SQ jack tip - the square through 1k, about +/-5 V", "parts": [ { "id": "JK3", "kind": "jack", "lug": "T", "value": "3.5 mm", "role": "square out" } ] }, { "id": "lrp18", "label": "LED_A", "at": [ 18, 22 ], "to": "rate LED anode, through R9; D3 across the LED takes the negative half", "parts": [ { "id": "LED1", "kind": "led", "lug": "A", "value": "5 mm", "role": "rate" } ] }, { "id": "lrp19", "label": "LED_K", "at": [ 17, 18 ], "to": "rate LED cathode", "parts": [ { "id": "LED1", "kind": "led", "lug": "K", "value": "5 mm", "role": "rate" } ] }, { "id": "lrp20", "label": "GND_P", "at": [ 17, 22 ], "to": "ground for the panel: every jack sleeve", "parts": [ { "id": "JK1", "kind": "jack", "lug": "S", "value": "3.5 mm", "role": "triangle out" }, { "id": "JK2", "kind": "jack", "lug": "S", "value": "3.5 mm", "role": "sine out" }, { "id": "JK3", "kind": "jack", "lug": "S", "value": "3.5 mm", "role": "square out" } ] } ], "netlist": "# LFO Rack - written from the board\n# 20 strips of 23 holes, 35 parts, 1 chip, 19 cuts\n#\n# TL074 on +/-12 V. B integrates (pin 7 TRI), C is the Schmitt (pin 8 SQ, raw),\n# D scales the square to +/-5 V (pin 14), A rounds the triangle into a sine\n# through D4/D5 and gives it gain 7.8 (pin 1). 2x5 power header H1-H10, red\n# stripe at H1/H2 on strip 1; a 1N5817 on each rail. No regulator.\n\n-12_RAW: @H1 @H2 D2.B\n-12: D2.A C6.A C8.A IC1.11 J6.A J6.B\n+12_RAW: @H9 @H10 D1.A\n+12: D1.B C5.A C7.A IC1.4 J3.A J3.B\nGND: @H3 @H4 @H5 @H6 @H7 @H8 J1.A J1.B J1b.A J1b.B C5.B C6.B C7.B C8.B IC1.5 IC1.9 IC1.12 J2.A J2.B J7.A J7.B J8.A J8.B J10.A J10.B D3.A D4.B D5.A R11.B @LED_K @GND_P\nTRI: IC1.7 J4.A J4.B C1.A R2.A R10.A R6.A @TRI\nINT: IC1.6 J5.A J5.B C1.B R1.B C4.A\nRATE_W: R1.A @RATE_W\nRANGE_C: C4.B @RANGE_C\nSQ: IC1.8 R5.A R13.A @SQ\nTRIG: IC1.10 J11.A J11.B R2.B R5.B\nSQ_IN: IC1.13 R13.B R14.B\nSQ_X: IC1.14 J9.A J9.B R14.A R8.A R9.A\nSQ_J: R8.B @SQ_J\nLED_A: R9.B D3.B @LED_A\nSINE_NODE: IC1.3 R10.B D4.A D5.B\nSINE_IN: IC1.2 R11.A R12.B\nSINE: IC1.1 R12.A R15.A\nSINE_J: R15.B @SINE_J\nTRI_J: R6.B @TRI_J\n" }