{ "version": 2, "name": "Follower Rack", "board": { "rows": 17, "cols": 18, "kind": "strip" }, "cuts": [ "3,7", "4,6", "8,7", "8,11", "8,15", "9,7", "10,7", "11,7", "12,7", "12,12", "13,7", "14,3", "14,7", "14,11", "15,4", "15,14", "16,5" ], "parts": [ { "kind": "diode", "value": "1N5817", "polarized": true, "device": "schottky", "mount": "vertical", "id": "fr001", "ref": "D3", "pins": [ [ 5, 13 ], [ 6, 13 ] ] }, { "kind": "diode", "value": "1N5817", "polarized": true, "device": "schottky", "mount": "vertical", "id": "fr002", "ref": "D4", "pins": [ [ 0, 13 ], [ 1, 13 ] ] }, { "kind": "ecap", "value": "10u", "polarized": true, "id": "fr003", "ref": "C5", "pins": [ [ 6, 11 ], [ 4, 11 ] ] }, { "kind": "ecap", "value": "10u", "polarized": true, "id": "fr004", "ref": "C6", "pins": [ [ 0, 11 ], [ 2, 11 ] ] }, { "kind": "cap", "value": "100n", "device": "ceramic disc", "id": "fr005", "ref": "C7", "pins": [ [ 6, 9 ], [ 4, 9 ] ] }, { "kind": "cap", "value": "100n", "device": "ceramic disc", "id": "fr006", "ref": "C8", "pins": [ [ 0, 9 ], [ 2, 9 ] ] }, { "id": "fr007", "kind": "link", "ref": "J1", "pins": [ [ 8, 16 ], [ 7, 16 ] ] }, { "id": "fr008", "kind": "link", "ref": "J2", "pins": [ [ 3, 8 ], [ 2, 8 ] ] }, { "id": "fr009", "kind": "link", "ref": "J3", "pins": [ [ 3, 10 ], [ 4, 10 ] ] }, { "id": "fr010", "kind": "link", "ref": "J4", "pins": [ [ 7, 12 ], [ 4, 12 ] ] }, { "id": "fr011", "kind": "link", "ref": "J5", "pins": [ [ 15, 13 ], [ 13, 13 ] ] }, { "id": "fr012", "kind": "link", "ref": "J6", "pins": [ [ 12, 5 ], [ 15, 5 ] ] }, { "id": "fr013", "kind": "link", "ref": "J7", "pins": [ [ 8, 12 ], [ 13, 12 ] ] }, { "id": "fr014", "kind": "link", "ref": "J8", "pins": [ [ 14, 4 ], [ 13, 4 ] ] }, { "id": "fr015", "kind": "link", "ref": "J9", "pins": [ [ 15, 0 ], [ 13, 0 ] ] }, { "id": "fr016", "kind": "link", "ref": "J10", "pins": [ [ 3, 2 ], [ 10, 2 ] ] }, { "id": "fr017", "kind": "link", "ref": "J11", "pins": [ [ 11, 3 ], [ 6, 3 ] ] }, { "id": "fr018", "kind": "link", "ref": "J12", "pins": [ [ 8, 10 ], [ 12, 10 ] ] }, { "id": "fr019", "kind": "link", "ref": "J13", "pins": [ [ 0, 15 ], [ 11, 15 ] ] }, { "kind": "res", "value": "1M", "device": "fixed", "id": "fr020", "ref": "R1", "pins": [ [ 10, 11 ], [ 7, 11 ] ] }, { "kind": "res", "value": "22k", "device": "fixed", "mount": "vertical", "id": "fr021", "ref": "R3", "pins": [ [ 9, 17 ], [ 8, 17 ] ] }, { "kind": "res", "value": "1k", "device": "fixed", "mount": "vertical", "id": "fr022", "ref": "R4", "pins": [ [ 14, 17 ], [ 15, 17 ] ] }, { "kind": "res", "value": "10k", "device": "fixed", "mount": "vertical", "id": "fr023", "ref": "R5", "pins": [ [ 15, 11 ], [ 16, 11 ] ] }, { "kind": "res", "value": "1k", "device": "fixed", "mount": "vertical", "id": "fr024", "ref": "R6", "pins": [ [ 15, 2 ], [ 14, 2 ] ] }, { "kind": "res", "value": "1k", "device": "fixed", "mount": "vertical", "id": "fr025", "ref": "R7", "pins": [ [ 15, 3 ], [ 16, 3 ] ] }, { "kind": "res", "value": "100k", "device": "fixed", "id": "fr026", "ref": "R8", "pins": [ [ 13, 1 ], [ 9, 1 ] ] }, { "kind": "res", "value": "100k", "device": "fixed", "mount": "vertical", "id": "fr027", "ref": "R9", "pins": [ [ 8, 5 ], [ 9, 5 ] ] }, { "kind": "res", "value": "15k", "device": "fixed", "mount": "vertical", "id": "fr028", "ref": "R10", "pins": [ [ 11, 5 ], [ 10, 5 ] ] }, { "kind": "res", "value": "10k", "device": "fixed", "mount": "vertical", "id": "fr029", "ref": "R11", "pins": [ [ 3, 4 ], [ 2, 4 ] ] }, { "kind": "res", "value": "1k", "device": "fixed", "id": "fr030", "ref": "R12", "pins": [ [ 8, 4 ], [ 4, 4 ] ] }, { "kind": "cap", "value": "100n", "device": "box film", "id": "fr031", "ref": "C1", "pins": [ [ 12, 14 ], [ 10, 14 ] ] }, { "kind": "cap", "value": "1u", "device": "box film", "id": "fr032", "ref": "C2", "pins": [ [ 8, 14 ], [ 7, 14 ] ] }, { "kind": "ecap", "value": "10u", "polarized": true, "id": "fr033", "ref": "C3", "pins": [ [ 3, 6 ], [ 2, 6 ] ] }, { "kind": "diode", "value": "1N4148", "polarized": true, "device": "switching", "id": "fr034", "ref": "D2", "pins": [ [ 14, 10 ], [ 14, 12 ] ] } ], "ics": [ { "id": "fric1", "ref": "IC1", "part": "TL074", "pins": 14, "pin1": [ 8, 6 ], "span": 3, "autoCuts": [ "8,7", "9,7", "10,7", "11,7", "12,7", "13,7", "14,7" ] } ], "pads": [ { "id": "frp01", "label": "H1", "at": [ 1, 16 ], "to": "power header pin 1: -12 V. The cable's RED STRIPE is this end" }, { "id": "frp02", "label": "H2", "at": [ 1, 17 ], "to": "power header pin 2: -12 V. The cable's RED STRIPE is this end" }, { "id": "frp03", "label": "H3", "at": [ 2, 16 ], "to": "power header pin 3: ground" }, { "id": "frp04", "label": "H4", "at": [ 2, 17 ], "to": "power header pin 4: ground" }, { "id": "frp05", "label": "H5", "at": [ 3, 16 ], "to": "power header pin 5: ground" }, { "id": "frp06", "label": "H6", "at": [ 3, 17 ], "to": "power header pin 6: ground" }, { "id": "frp07", "label": "H7", "at": [ 4, 16 ], "to": "power header pin 7: ground" }, { "id": "frp08", "label": "H8", "at": [ 4, 17 ], "to": "power header pin 8: ground" }, { "id": "frp09", "label": "H9", "at": [ 5, 16 ], "to": "power header pin 9: +12 V" }, { "id": "frp10", "label": "H10", "at": [ 5, 17 ], "to": "power header pin 10: +12 V" }, { "id": "frp11", "label": "IN", "at": [ 12, 13 ], "to": "IN jack tip. Anything from a rack VCO to a drum module", "parts": [ { "id": "JK1", "kind": "jack", "lug": "T", "value": "3.5 mm", "role": "in" } ] }, { "id": "frp12", "label": "SENS_A", "at": [ 9, 16 ], "to": "SENSITIVITY pot (A1M) lug 1. A variable resistor: lug 3 stays empty", "parts": [ { "id": "POT1", "kind": "pot", "lug": "1", "value": "A1M", "role": "sensitivity" } ] }, { "id": "frp13", "label": "SENS_W", "at": [ 12, 11 ], "to": "SENSITIVITY pot wiper. Turned down is x1, up about x46", "parts": [ { "id": "POT1", "kind": "pot", "lug": "W", "value": "A1M", "role": "sensitivity" } ] }, { "id": "frp14", "label": "GND_P", "at": [ 3, 11 ], "to": "ground for the panel: every jack sleeve, the LED cathode, the RELEASE pot wiper", "parts": [ { "id": "JK1", "kind": "jack", "lug": "S", "value": "3.5 mm", "role": "in" }, { "id": "JK2", "kind": "jack", "lug": "S", "value": "3.5 mm", "role": "CV out" }, { "id": "JK3", "kind": "jack", "lug": "S", "value": "3.5 mm", "role": "inverted CV out" }, { "id": "LED1", "kind": "led", "lug": "K", "value": "3 mm", "role": "CV" }, { "id": "POT3", "kind": "pot", "lug": "W", "value": "B1M", "role": "release" } ] }, { "id": "frp15", "label": "ATT_A", "at": [ 15, 15 ], "to": "ATTACK pot (B100K) lug 1", "parts": [ { "id": "POT2", "kind": "pot", "lug": "1", "value": "B100K", "role": "attack" } ] }, { "id": "frp16", "label": "ATT_W", "at": [ 13, 15 ], "to": "ATTACK pot wiper. Lug 3 stays empty", "parts": [ { "id": "POT2", "kind": "pot", "lug": "W", "value": "B100K", "role": "attack" } ] }, { "id": "frp17", "label": "REL_A", "at": [ 16, 9 ], "to": "RELEASE pot (B1M) lug 1; its wiper goes to GND_P, lug 3 stays empty", "parts": [ { "id": "POT3", "kind": "pot", "lug": "1", "value": "B1M", "role": "release" } ] }, { "id": "frp18", "label": "CV", "at": [ 14, 1 ], "to": "CV OUT jack tip, through 1k: 0 to about 10 V, rising with the sound", "parts": [ { "id": "JK2", "kind": "jack", "lug": "T", "value": "3.5 mm", "role": "CV out" } ] }, { "id": "frp19", "label": "LED_A", "at": [ 16, 4 ], "to": "LED anode, the long leg; the cathode to GND_P", "parts": [ { "id": "LED1", "kind": "led", "lug": "A", "value": "3 mm", "role": "CV" } ] }, { "id": "frp20", "label": "INV", "at": [ 4, 5 ], "to": "INV OUT jack tip, through 1k: about 9.4 V in silence, falling as the sound rises", "parts": [ { "id": "JK3", "kind": "jack", "lug": "T", "value": "3.5 mm", "role": "inverted CV out" } ] } ], "netlist": "# Follower Rack - written from the design\n# The Envelope Follower on a TL074 and +/-12 V.\n# D (12-14): sensitivity, x1 to about x46 with the SENS pot over R3 22k.\n# C (8-10): the peak catcher. D2 inside the loop: positive peaks only.\n# ATTACK: R4 1k plus the pot into C2. RELEASE: R5 10k plus the pot.\n# B (5-7): the buffer, so the jack and the LED never drain C2.\n# A (1-3): the inverter. INV = 2 x VREF - CV, VREF about 4.7 V.\n# Power header H1-H10, red stripe at H1/H2 on strip b; a 1N5817 on each rail.\n# Attack about 1 to 100 ms, release about 10 ms to 1 s, CV 0 to about 10 V.\n\n-12RAW: @H1 @H2 D4.B\n-12: D4.A IC1.11 C6.A C8.A\nGND: @H3 @H4 @H5 @H6 @H7 @H8 @GND_P R1.B R3.B R11.B C2.B C3.B C5.B C6.B C7.B C8.B\n+12RAW: @H9 @H10 D3.A\n+12: D3.B IC1.4 R10.A C5.A C7.A\nIN: @IN C1.A\nINP: IC1.12 C1.B R1.A\nFB: IC1.13 R3.A @SENS_A\nGAIN: IC1.14 IC1.10 @SENS_W\nPKO: IC1.8 D2.A\nPK: D2.B R4.A\nATT: R4.B @ATT_A\nHOLD: IC1.9 IC1.5 C2.A R5.A @ATT_W\nREL: R5.B @REL_A\nCV: IC1.6 IC1.7 R6.A R7.A R8.A\nCV_J: R6.B @CV\nLED: R7.B @LED_A\nVREF: IC1.3 R10.B R11.A C3.A\nINVN: IC1.2 R8.B R9.B\nINV: IC1.1 R9.A R12.A\nINV_J: R12.B @INV\n" }