{
 "description": "Where EIS differs from the Doepfer A-100 documents: each statement on which EIS is stricter, looser, different, or more specific, with its source, what EIS says on the same point, and the requirements that say it (Annex J).",
 "retrieved": "2026-10-22",
 "topics": [
  "rack and frame",
  "rails and inserts",
  "module depth",
  "panel height",
  "mounting holes",
  "panel width and HP",
  "panel thickness and material",
  "mounting screws",
  "boards",
  "bus connector and pinout",
  "ribbon cable",
  "bus board",
  "current limits",
  "power supply",
  "ripple and protection",
  "grounding",
  "bus CV and gate",
  "audio signal levels",
  "CV signal levels",
  "gate and trigger",
  "pitch CV at 1 V/octave",
  "impedances",
  "use, handling, and documents"
 ],
 "sources": [
  {
   "id": "a100m-e-htm",
   "short": "Construction",
   "title": "Construction Details A-100",
   "url": "https://www.doepfer.de/a100_man/a100m_e.htm"
  },
  {
   "id": "a100z-e-htm",
   "short": "Accessories",
   "title": "A-100 accessories",
   "url": "https://www.doepfer.de/a100z_e.htm"
  },
  {
   "id": "a100o-e-htm",
   "short": "Ordering",
   "title": "A-100 ordering notes",
   "url": "https://www.doepfer.de/a100_man/a100o_e.htm"
  },
  {
   "id": "a100-diy-htm",
   "short": "DIY",
   "title": "A-100 DIY page",
   "url": "https://www.doepfer.de/DIY/a100_diy.htm"
  },
  {
   "id": "a100g6-e-pdf",
   "short": "G6 frame",
   "title": "A-100G6 frame assembly instructions",
   "url": "https://www.doepfer.de/a100_man/A100G6_e.pdf"
  },
  {
   "id": "a100-cases-e-htm",
   "short": "Cases",
   "title": "A-100 cases",
   "url": "https://www.doepfer.de/a100_cases_e.htm"
  },
  {
   "id": "a100-diy-kits-htm",
   "short": "DIY kits",
   "title": "A-100 DIY kits",
   "url": "https://www.doepfer.de/a100_DIY_kits.htm"
  },
  {
   "id": "a100-diy-kit-1-pdf",
   "short": "Kit #1",
   "title": "A-100 DIY Kit #1 instructions",
   "url": "https://www.doepfer.de/a100_man/A100_DIY_Kit_1.pdf"
  },
  {
   "id": "a100-short-form-manual-2025-pdf",
   "short": "Short manual",
   "title": "A-100 short-form manual, 2025",
   "url": "https://www.doepfer.de/a100_man/A100_short_form_manual_2025.pdf"
  },
  {
   "id": "a100t-e-htm",
   "short": "Technical",
   "title": "Technical Details A-100",
   "url": "https://www.doepfer.de/a100_man/a100t_e.htm"
  },
  {
   "id": "a100-bus-orientation-pdf",
   "short": "Bus orientation",
   "title": "A-100 bus cable orientation",
   "url": "https://www.doepfer.de/a100_man/A100_bus_orientation.pdf"
  },
  {
   "id": "a100-faq-htm",
   "short": "FAQ",
   "title": "A-100 FAQ",
   "url": "https://www.doepfer.de/faq/a100_faq.htm"
  },
  {
   "id": "a100-bus-cables-pdf",
   "short": "Bus cables",
   "title": "A-100 bus cables",
   "url": "https://www.doepfer.de/a100_man/A100_bus_cables.pdf"
  },
  {
   "id": "a100-manual-complete-pdf",
   "short": "Manual",
   "title": "A-100 manual, complete",
   "url": "https://www.doepfer.de/a100_man/A100_Manual_complete.pdf"
  },
  {
   "id": "a100psu3-wiring-pdf",
   "short": "PSU3 wiring",
   "title": "A-100PSU3 wiring",
   "url": "https://www.doepfer.de/a100_man/A100PSU3_wiring.pdf"
  }
 ],
 "doepfer": [
  {
   "id": "D-001",
   "topic": "rack and frame",
   "statement": "The A-100 is built on the international 19\" rack system: DIN 41494 / IEC 297-3 / IEEE 1001.1.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "EIS requires a rack-mount frame to meet IEC 60297-3-101:2004 and IEC 60297-3-100:2008 for the 482.6 mm flange width, the flange holes and slot, the 132.55 mm 3U height H1, and the 84 HP row; a desktop case needs no flanges.",
   "ids": [
    "RACK-001",
    "RACK-002",
    "RACK-003"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-003",
   "topic": "rack and frame",
   "statement": "Because the 19\" standard is used, A-100 front panels \"may fit\" frames from other makers.",
   "doepfer_kind": "typical",
   "sources": [
    "a100z-e-htm"
   ],
   "eis": "EIS makes cross-maker fit binding through the panel width ceiling, the 122.5 mm hole span, the hole grid and the 5.08 mm insert pitch.",
   "ids": [
    "RACK-003",
    "PANEL-002",
    "PANEL-009",
    "PANEL-011",
    "RAIL-001"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-005",
   "topic": "rack and frame",
   "statement": "Usable width per row is 84 HP (= 426.4 mm). Elsewhere 84 HP is given as 426.7 mm (back panel remark).",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm",
    "a100z-e-htm"
   ],
   "eis": "EIS keeps the 84 HP row and requires a rail of at least N × 5.08 mm, 426.72 mm for 84 HP, which Doepfer's 426.4 mm figure falls 0.32 mm short of.",
   "ids": [
    "RACK-003",
    "RAIL-002"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-009",
   "topic": "rails and inserts",
   "statement": "A tapped-hole strip with M3 threads goes into each of the four front lipped rails, and modules fix to it. Each lipped back rail gets 3 sliding nuts (middle and both ends) for the back plate. Two unlipped rails get 8 sliding nuts for the bus board; the third has no insert and only reinforces the top cover. Nuts in rail 2 face the rear; nuts in rail 3 and the strip in rail 1 face the front. Using the wrong rail type in a position causes problems.",
   "doepfer_kind": "rule",
   "sources": [
    "a100g6-e-pdf"
   ],
   "eis": "EIS requires a threaded M3 insert at least 1.5 mm thick with holes 5.08 mm apart; the rear and bus board rail arrangement is not covered.",
   "ids": [
    "RAIL-001",
    "RAIL-003",
    "RAIL-004"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-013",
   "topic": "module depth",
   "statement": "Doepfer sets no maximum module depth. Depth appears only as the usable depth of each case. Modules with increased depth (e.g. A-113, A-126) must not go in the PSU area of the low-cost cases.",
   "doepfer_kind": "not specified",
   "sources": [
    "a100-cases-e-htm"
   ],
   "eis": "A module publishes how far it extends behind the panel and an enclosure publishes each row's clear depth; EIS recommends at most 50 mm module depth and at least 50 mm row depth, with no maximum.",
   "ids": [
    "PANEL-003",
    "ENC-001"
   ],
   "difference": "added"
  },
  {
   "id": "D-020",
   "topic": "rails and inserts",
   "statement": "DIY Kit #1 rails: four 84 HP aluminum extruded rails, ~427 mm long, with 8 mounting screws. About 160 M3 nuts (kit PDF: ~168 = 4 × 42, ~42 per rail) slide into the rail groove. Modules can then sit anywhere, including other makers' modules with different hole positions, without gaps.",
   "doepfer_kind": "typical",
   "sources": [
    "a100-diy-kits-htm",
    "a100-diy-kit-1-pdf"
   ],
   "eis": "EIS requires insert holes on a fixed 5.08 mm pitch and every panel hole on that grid; slide nuts appear only informatively, in the recommended rail section of 5.3.",
   "ids": [
    "RAIL-001",
    "RAIL-002",
    "PANEL-011"
   ],
   "difference": "changed"
  },
  {
   "id": "D-023",
   "topic": "rack and frame",
   "statement": "Self-build: cover and rear panel length must equal the rail length. Side height is found by test-mounting a module on two rails and measuring from the top of the upper rail to the bottom of the lower rail.",
   "doepfer_kind": "recommendation",
   "sources": [
    "a100-diy-kit-1-pdf"
   ],
   "eis": "EIS fixes the span between the two rails' inserts at 122.5 mm, so a row's height is set by figure rather than by test-mounting.",
   "ids": [
    "PANEL-009"
   ],
   "difference": "added"
  },
  {
   "id": "D-029",
   "topic": "panel height",
   "statement": "1U = 1.75 inch = 44.45 mm; 3U = 133.4 mm. All front panels are 3U high.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "One rack unit is 44.45 mm, three are 133.35 mm, and a module may be 1U or 3U high.",
   "ids": [
    "RACK-002",
    "PANEL-001"
   ],
   "difference": "relaxed"
  },
  {
   "id": "D-030",
   "topic": "panel height",
   "statement": "Final panel height is less than 133.4 mm because of the mounting-rail rim: 128.5 mm for all A-100 front panels.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "EIS requires a 3U front panel 128.5 mm high, within ±0.2 mm.",
   "ids": [
    "PANEL-006"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-031",
   "topic": "mounting holes",
   "statement": "The panel drawing gives hole centers 3.0 mm above the bottom edge (0) and at 125.5 mm, which is 3.0 mm below the 128.5 mm top. The figures are only in image A100FP.gif (no alt text); I read them from the image.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "Mounting holes are 3.0 mm in from top and bottom within ±0.1 mm, a 122.5 mm span within ±0.1 mm on the panel and between the rail inserts.",
   "ids": [
    "PANEL-008",
    "PANEL-009"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-033",
   "topic": "panel width and HP",
   "statement": "Actual panel width is \"a few tenth of a mm\" less than N × 5.08 mm, to give assembly tolerance.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "EIS requires an N HP panel no wider than N × 5.08 mm, and recommends 0.3 mm narrower.",
   "ids": [
    "PANEL-002"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-034",
   "topic": "panel width and HP",
   "statement": "Table 1, HP: calculated / actual mm: 1: 5.08/5.00; 1.5: 7.62/7.50; 2: 10.16/9.80; 4: 20.32/20.00; 6: 30.48/30.00; 8: 40.64/40.30; 10: 50.80/50.50; 12: 60.96/60.60; 14: 71.12/70.80; 16: 81.28/80.90; 18: 91.44/91.30; 20: 101.60/101.30; 21: 106.68/106.30; 22: 111.76/111.40; 28: 142.24/141.90; 42: 213.36/213.00.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "Widths are whole HP only, at most N × 5.08 mm, with N × 5.08 mm minus 0.3 mm recommended; EIS's own width table replaces Table 1.",
   "ids": [
    "PANEL-002"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-035",
   "topic": "panel width and HP",
   "statement": "Blank panels: B1 1 HP / 5 mm (only to combine odd-HP modules, e.g. Harvestman). B1.5 1.5 HP / 7.5 mm (gap filler for modules with different hole positions, e.g. Analogue Systems). B2 2 HP / 10 mm; B4 4 HP / 20 mm; B8 8 HP / 41 mm; B42 42 HP / 213 mm. The 8 HP blank at 41 mm differs from Table 1's 40.30 mm.",
   "doepfer_kind": "rule",
   "sources": [
    "a100z-e-htm"
   ],
   "eis": "A blank meets the module panel rules: whole HP and at most N × 5.08 mm, so a 1.5 HP blank is not an EIS width and an 8 HP blank at 41 mm would exceed 40.64 mm by 0.36 mm.",
   "ids": [
    "PANEL-002",
    "PANEL-004"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-036",
   "topic": "panel width and HP",
   "statement": "Order notes say every A-100 panel is a multiple of 2 HP, with no odd HP, and the frame sketch uses a 2 HP grid. This conflicts with the 1, 1.5 and 21 HP entries in Table 1.",
   "doepfer_kind": "rule",
   "sources": [
    "a100o-e-htm"
   ],
   "eis": "A panel may be any positive whole number of HP, odd or even.",
   "ids": [
    "PANEL-002"
   ],
   "difference": "relaxed"
  },
  {
   "id": "D-038",
   "topic": "panel thickness and material",
   "statement": "Front panels are 2 mm anodized aluminum. Standard blanks are 2 mm silver-grey anodized; Vintage Edition blanks (B2V/B4V/B8V/B42V) are 2 mm black anodized; B1V and B1.5V are not available.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm",
    "a100z-e-htm"
   ],
   "eis": "EIS limits a front panel to 2.0 mm thick; it recommends 1.6 to 2.0 mm 5052 aluminum or FR-4 and sets no finish or color.",
   "ids": [
    "PANEL-004",
    "PANEL-014"
   ],
   "difference": "relaxed"
  },
  {
   "id": "D-040",
   "topic": "mounting holes",
   "statement": "Horizontal distance between holes must be a multiple of the HP grid, N × 5.08 mm.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "Each hole is a whole number of HP plus 2.54 mm from the nominal left edge, within ±0.1 mm, so hole spacing stays a multiple of 5.08 mm.",
   "ids": [
    "PANEL-011",
    "RAIL-001"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-041",
   "topic": "mounting holes",
   "statement": "Drawing: hole diameter d = 3.2 mm; first hole column 7.5 mm from the left panel edge. Image only (A100FP.gif).",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "Holes are Ø3.2 mm +0.1/−0 mm or a 3.2 mm slot up to 5.5 mm long, and the first column of a wide panel is 7.62 mm from the nominal left edge, 0.12 mm further in than Doepfer's 7.5 mm.",
   "ids": [
    "PANEL-010",
    "PANEL-011"
   ],
   "difference": "changed"
  },
  {
   "id": "D-042",
   "topic": "mounting holes",
   "statement": "Table 1 is titled as giving hole positions relative to the panel edges, but the positions appear only in the drawing. No per-width hole table is published.",
   "doepfer_kind": "not specified",
   "sources": [
    "a100m-e-htm"
   ],
   "eis": "EIS fixes every hole position for every width and draws the patterns from 1 to 8 HP.",
   "ids": [
    "PANEL-011"
   ],
   "difference": "added"
  },
  {
   "id": "D-043",
   "topic": "mounting screws",
   "statement": "Modules mount with M3x6 oval-head cross-recess screws (DIN 7985). The short-form manual also says \"M3x6\".",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm",
    "a100-short-form-manual-2025-pdf"
   ],
   "eis": "EIS requires an M3 screw of 0.5 mm pitch with a head at most 7.0 mm across, its length inside a window each rail sets and the enclosure publishes.",
   "ids": [
    "RAIL-005",
    "RAIL-006",
    "RAIL-007",
    "RAIL-008",
    "RAIL-009",
    "RAIL-010",
    "RAIL-011"
   ],
   "difference": "changed"
  },
  {
   "id": "D-046",
   "topic": "boards",
   "statement": "Modules built since about 2015 carry a rectangle and the text \"RED STRIPE\" on the PCB beside the bus connector.",
   "doepfer_kind": "rule",
   "sources": [
    "a100-faq-htm"
   ],
   "eis": "EIS requires a module, a bus board, or a power supply to mark the −12 V end of each power header on the board, in any form.",
   "ids": [
    "BUS-019",
    "BUS-004"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-055",
   "topic": "bus connector and pinout",
   "statement": "Bus headers are 16-pin, 2-row, 2.54 mm pitch. Cables use 10- or 16-wire flat cable with press-on 16-pin IDC sockets.",
   "doepfer_kind": "rule",
   "sources": [
    "a100-faq-htm"
   ],
   "eis": "A header on a module or a bus board is a 2 × 5 or 2 × 8 header on a 2.54 mm grid mated by IDC ribbon sockets, so a bus board header may also be 10-pin, not only 16-pin as on Doepfer's boards.",
   "ids": [
    "BUS-002",
    "BUS-015"
   ],
   "difference": "relaxed"
  },
  {
   "id": "D-057",
   "topic": "bus connector and pinout",
   "statement": "Module side: with a vertical header the colored wire goes at the bottom. With a horizontal header it goes left (rear view), except on the A-111-5, which has its own drawing.",
   "doepfer_kind": "rule",
   "sources": [
    "a100-faq-htm",
    "a100-bus-orientation-pdf"
   ],
   "eis": "EIS fixes no orientation of the header on a module; it requires the −12 V end of every power header to be marked on the board and the marked conductor to point to it.",
   "ids": [
    "BUS-004",
    "BUS-019"
   ],
   "difference": "changed"
  },
  {
   "id": "D-058",
   "topic": "bus connector and pinout",
   "statement": "Applying other voltages than described, or reversing polarity, destroys a module instantly.",
   "doepfer_kind": "rule",
   "sources": [
    "a100t-e-htm"
   ],
   "eis": "EIS requires a module to survive a reversed ribbon at its power header; any other voltage on the pins is outside EIS.",
   "ids": [
    "BUS-009",
    "DC-006"
   ],
   "difference": "added"
  },
  {
   "id": "D-059",
   "topic": "bus connector and pinout",
   "statement": "Supplies above ±12 V, a missing GND or swapped rails destroy modules, and the warranty is void.",
   "doepfer_kind": "rule",
   "sources": [
    "a100o-e-htm"
   ],
   "eis": "EIS requires modules to survive a reversed ribbon, holds each supply rail within ±5 % of nominal, and bounds the supply's start-up overshoot to 10 % and its reverse swing to 0.7 V; rails beyond that or a missing 0 V are outside EIS.",
   "ids": [
    "BUS-009",
    "GND-001",
    "SUP-005",
    "SUP-006",
    "SUP-010"
   ],
   "difference": "added"
  },
  {
   "id": "D-063",
   "topic": "ribbon cable",
   "statement": "Cable length ~20 cm: A-100BM10 (10-to-16) and A-100BM16 (16-to-16). Special cables with 2 or 4 ten-pin module connectors have them ~6.5 cm apart.",
   "doepfer_kind": "typical",
   "sources": [
    "a100z-e-htm",
    "a100-bus-cables-pdf"
   ],
   "eis": "EIS limits a power ribbon from a bus header to a module to 400 mm, with conductors of at least 28 AWG; it sets no connector spacing for multi-socket cables.",
   "ids": [
    "BUS-015"
   ],
   "difference": "added"
  },
  {
   "id": "D-071",
   "topic": "bus board",
   "statement": "PSU-to-bus cables: until end of 2015, 3 wires (GND, −12, +12); since then 4 wires (+5 V added). Flat connectors both ends, ~30 cm, 0.75 mm².",
   "doepfer_kind": "typical",
   "sources": [
    "a100z-e-htm"
   ],
   "eis": "Row wiring is stranded copper rated 105 C with a crimped ring terminal on an M4 terminal at each end, at least 18 AWG and heavier as the current rises, and at most 5 mΩ end to end with 0 V no higher than the rails; Doepfer's 0.75 mm2 lead on flat connectors is outside EIS, and +5 V stays optional.",
   "ids": [
    "PWR-005",
    "PWR-006",
    "PWR-007",
    "ASM-008"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-086",
   "topic": "current limits",
   "statement": "The total current of all modules must not exceed the PSU maximum (1200 mA; 650 mA on old units). Otherwise fit a second PSU at position (4).",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm",
    "a100-manual-complete-pdf"
   ],
   "eis": "Each rail's summed module current must stay within the published total of every source and bus board feeding it and within each outlet's limit, counted per rail and per board.",
   "ids": [
    "ASM-001",
    "PWR-001",
    "PWR-002",
    "BUS-008",
    "BUS-012"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-087",
   "topic": "current limits",
   "statement": "Historically only the +12 V current was quoted, as the worst case. No A-100 module draws more at −12 V than at +12 V. Since the PSU3 (2016) both are given separately.",
   "doepfer_kind": "rule",
   "sources": [
    "a100-faq-htm"
   ],
   "eis": "Every module publishes its maximum current on each rail, stating 0 for a rail it does not draw; where −12 V is missing EIS recommends planning it at 50 % of +12 V.",
   "ids": [
    "PWR-001"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-089",
   "topic": "current limits",
   "statement": "The Excel planner total must be under 1200 mA; otherwise a second PSU is needed.",
   "doepfer_kind": "rule",
   "sources": [
    "a100o-e-htm"
   ],
   "eis": "The per-rail sum stays within every published source and outlet total; the Annex E row budget is an informative worksheet for it.",
   "ids": [
    "ASM-001"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-097",
   "topic": "power supply",
   "statement": "Each PSU3 rail has its own switcher, so the rails do not rise together: delay 1–1.5 s after power-on, rise time 20–30 ms. This may upset the reset of third-party digital modules.",
   "doepfer_kind": "typical",
   "sources": [
    "a100z-e-htm"
   ],
   "eis": "EIS sets no rail delay, rise time or order, but at start-up no rail may overshoot by more than 10 % or swing more than one diode drop toward the opposite polarity.",
   "ids": [
    "SUP-005",
    "SUP-006"
   ],
   "difference": "added"
  },
  {
   "id": "D-108",
   "topic": "power supply",
   "statement": "A high-quality linear supply is recommended. Switching supplies Doepfer tested showed up to 200 mV load-dependent change on ±12 V, against ~5 mV for the PSU2. For frames with VCOs use the PSU2 or a linear supply with load regulation of 10 mV or better.",
   "doepfer_kind": "recommendation",
   "sources": [
    "a100-diy-htm"
   ],
   "eis": "EIS requires no linear topology; bus ripple and noise must be below 150 mV peak-to-peak and published, and it only recommends load regulation within 1 % (about 120 mV at 12 V), looser than Doepfer's 10 mV for VCO frames.",
   "ids": [
    "SUP-001",
    "SUP-007"
   ],
   "difference": "relaxed"
  },
  {
   "id": "D-115",
   "topic": "ripple and protection",
   "statement": "No ripple, noise, regulation-tolerance or output-voltage tolerance figure is published for any A-100 PSU. The only related figures are the load-change ones in D-108.",
   "doepfer_kind": "not specified",
   "sources": [
    "a100t-e-htm",
    "a100z-e-htm",
    "a100-faq-htm"
   ],
   "eis": "EIS requires a supply to publish its ripple and noise on each rail by a stated method (20 MHz, 0.1 µF with 47 µF, 300 mm twisted pair), and bus ripple below 150 mV peak-to-peak.",
   "ids": [
    "SUP-001",
    "SUP-007"
   ],
   "difference": "added"
  },
  {
   "id": "D-124",
   "topic": "ripple and protection",
   "statement": "Most A-100 outputs have a 1k series protection resistor against shorts to GND or to another output. It causes a small drop that can affect 1 V/oct accuracy; use a buffer (A-185-1/-2) or bridge the resistor.",
   "doepfer_kind": "typical",
   "sources": [
    "a100-diy-htm"
   ],
   "eis": "EIS requires every patch output to survive an indefinite short to 0 V or to another output; its source impedance is 1 kΩ typical and at most 2 kΩ.",
   "ids": [
    "SIG-003",
    "SIG-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-125",
   "topic": "ripple and protection",
   "statement": "Inserting a plug into a standard A-100 jack momentarily shorts it, so non-protected outputs need another socket type. The DIY manual-gate circuit uses a 470 Ω resistor against shorting +12 V.",
   "doepfer_kind": "recommendation",
   "sources": [
    "a100-diy-htm"
   ],
   "eis": "EIS requires every patch output on the 3.5 mm TS jack to survive an indefinite short to 0 V or to another output, so an unprotected output does not conform.",
   "ids": [
    "SIG-003",
    "PANEL-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-128",
   "topic": "grounding",
   "statement": "Protective earth: the yellow/green lead goes to an eyelet screwed to the metal case and must never be another color. The 16-pin bus has three GND pin pairs (10-pin likewise). No other grounding scheme (star point, audio vs power ground) is specified.",
   "doepfer_kind": "rule",
   "sources": [
    "a100psu3-wiring-pdf",
    "a100-manual-complete-pdf"
   ],
   "eis": "Every 0 V pin of a header is connected, a bus board joins all headers to one 0 V at the supply terminal, a supply publishes where 0 V meets protective earth, and a 0 V bond is 14 AWG, or board copper of that section, on a ring, bracket, or standoff on an M4 or larger stud under a toothed washer.",
   "ids": [
    "GND-001",
    "GND-002",
    "GND-003",
    "PWR-008"
   ],
   "difference": "added"
  },
  {
   "id": "D-137",
   "topic": "bus CV and gate",
   "statement": "More than three VCO CV inputs on one bus (FAQ: more than 2–3 VCOs) need a buffered writer (A-185-1/-2, A-180-3). Otherwise losses cause scaling or octave-purity problems. A-190-2/-3/-4 have buffered outputs.",
   "doepfer_kind": "recommendation",
   "sources": [
    "a100-diy-htm",
    "a100-faq-htm"
   ],
   "eis": "Every bus CV transmitter drives from an op-amp through at most 100 Ω and holds 1.00 V/octave within 0.3 % at the header into 10 kΩ, ten listeners of 100 kΩ, whatever they are; EIS recommends at most ten listeners on a line.",
   "ids": [
    "BUS-017"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-140",
   "topic": "bus CV and gate",
   "statement": "A 10-pin module can still use bus CV/Gate with a 16-wire cable that has a 10-pin module connector, tapping wire #13/14 (CV) or #15/16 (Gate).",
   "doepfer_kind": "rule",
   "sources": [
    "a100-diy-htm"
   ],
   "eis": "A module may use the 10-pin header only if it uses neither +5 V nor bus CV or gate, so a module on bus CV or gate has a 16-pin header.",
   "ids": [
    "BUS-007"
   ],
   "difference": "changed"
  },
  {
   "id": "D-142",
   "topic": "audio signal levels",
   "statement": "Audio is typically 10 Vpp (−5 V to +5 V); the module description usually gives the exact level. The manual instead says audio \"lie[s] in the range\" −5 to +5 V (10 Vss).",
   "doepfer_kind": "typical",
   "sources": [
    "a100t-e-htm",
    "a100-manual-complete-pdf"
   ],
   "eis": "EIS keeps ±5 V (10 Vpp) as the typical nominal level but sets AUDIO full scale at ±10 V peak at the default range B10.",
   "ids": [
    "SIG-005"
   ],
   "difference": "changed"
  },
  {
   "id": "D-143",
   "topic": "audio signal levels",
   "statement": "Audio-processing inputs need about 1 Vpp minimum for a usable S/N. Higher levels are fine because nearly every audio input has an attenuator. Mics and guitars need an external preamp.",
   "doepfer_kind": "typical",
   "sources": [
    "a100-faq-htm"
   ],
   "eis": "EIS sets no minimum input level; an AUDIO input must accept its range's full swing without clipping, ±10 V at B10 within 0.5 dB, and mic and instrument levels appear only in informative Annex C.",
   "ids": [
    "SIG-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-145",
   "topic": "audio signal levels",
   "statement": "Audio inputs are normally AC-coupled and all filters are AC-coupled. CV generators and processors are DC-coupled. VCAs, dividers and waveshapers vary.",
   "doepfer_kind": "typical",
   "sources": [
    "a100-diy-htm"
   ],
   "eis": "AUDIO may be AC or DC coupled, with an AC-coupled input passing 20 Hz within 1 dB; CV, pitch, gate, trigger and clock classes are DC-coupled.",
   "ids": [
    "SIG-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-146",
   "topic": "CV signal levels",
   "statement": "CVs are typically −2.5 to +2.5 V (5 Vpp) for LFOs and 0 to +8 V for ADSRs; module descriptions usually give exact levels.",
   "doepfer_kind": "typical",
   "sources": [
    "a100t-e-htm"
   ],
   "eis": "EIS places an LFO at ±2.5 V in CV range B5 (±5 V, the default) and an ADSR at 0 to +8 V in range U10 (0 to +10 V).",
   "ids": [
    "SIG-005"
   ],
   "difference": "added"
  },
  {
   "id": "D-147",
   "topic": "CV signal levels",
   "statement": "CVs are relative: no fixed relation between a CV value and the controlled parameter. 0 V on a VCO does not mean C0 or 65.4 Hz. Panel scale labels do not matter.",
   "doepfer_kind": "rule",
   "sources": [
    "a100-faq-htm"
   ],
   "eis": "EIS leaves CV unscaled but recommends that 0 V on a PITCH port mean C0 (16.35 Hz), as a recommendation only.",
   "ids": [
    "SIG-005"
   ],
   "difference": "changed"
  },
  {
   "id": "D-150",
   "topic": "gate and trigger",
   "statement": "Gate, trigger and clock are rectangle signals, typically 0/+5 V. The trigger acts on the rising edge.",
   "doepfer_kind": "typical",
   "sources": [
    "a100t-e-htm"
   ],
   "eis": "GATE, TRIG and CLOCK outputs must be high at +4 V to +12 V into 100 kΩ and low at +0.5 V or less, and a TRIG input reads the rising edge through +3 V.",
   "ids": [
    "SIG-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-151",
   "topic": "gate and trigger",
   "statement": "Within the A-100, anything above about +3 V is \"high\" (+5, +8, +10, +12 V all work). Anything below 1 V is \"low\". Deviations are stated in the module description.",
   "doepfer_kind": "rule",
   "sources": [
    "a100t-e-htm"
   ],
   "eis": "A gate, trigger or clock input must read +3 V or more as high and +1 V or less as low, with at least 0.5 V of hysteresis recommended.",
   "ids": [
    "SIG-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-152",
   "topic": "gate and trigger",
   "statement": "All A-100 modules withstand gate/trigger/clock signals up to +12 V.",
   "doepfer_kind": "rule",
   "sources": [
    "a100t-e-htm"
   ],
   "eis": "Every patch input, whatever its class, must withstand ±12 V indefinitely from a source of 1 kΩ or less, and ±15 V is recommended.",
   "ids": [
    "SIG-002"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-154",
   "topic": "gate and trigger",
   "statement": "The manual says gates are typically 0 to +5 V or 0 to +12 V, and A-100 modules usually output +12 V. Gate, clock and reset inputs also work at lower levels (typically +5 V). This differs from D-150.",
   "doepfer_kind": "typical",
   "sources": [
    "a100-manual-complete-pdf"
   ],
   "eis": "EIS accepts gate outputs anywhere from +4 V to +12 V high and requires inputs to read +3 V as high, so 0/+5 V and 0/+12 V gates both conform.",
   "ids": [
    "SIG-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-157",
   "topic": "pitch CV at 1 V/octave",
   "statement": "A 1 V increase raises VCO pitch by one octave.",
   "doepfer_kind": "rule",
   "sources": [
    "a100t-e-htm"
   ],
   "eis": "PITCH is 1.00 V per octave within ±0.3 % of scale (3.6 cents per octave) over the claimed span, B10 by default.",
   "ids": [
    "SIG-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-158",
   "topic": "pitch CV at 1 V/octave",
   "statement": "CV is relative: no CV value (e.g. +1.0 V) is tied to an absolute pitch. Pitch is the sum of tune (coarse/fine), octave switch, CV inputs, attenuated inputs, bus CV, trims and linear FM. Attenuated and linear-FM inputs are not 1 V/oct. Some VCOs have 2+ 1 V/oct inputs, one possibly from the bus.",
   "doepfer_kind": "rule",
   "sources": [
    "a100t-e-htm",
    "a100-faq-htm"
   ],
   "eis": "EIS recommends that 0 V on a pitch port mean C0 (16.35 Hz), calling it a calibration figure, and lists a control input scaled other than 1 V/oct as CV with its scaling named.",
   "ids": [
    "SIG-005"
   ],
   "difference": "changed"
  },
  {
   "id": "D-159",
   "topic": "impedances",
   "statement": "Doepfer publishes no input or output impedance figures.",
   "doepfer_kind": "not specified",
   "sources": [
    "a100t-e-htm"
   ],
   "eis": "EIS sets source impedance at 1 kΩ typical and at most 2 kΩ and load at 100 kΩ typical and at least 47 kΩ for every class but VIDEO, which is 75 Ω ±1 % out and 100 kΩ ±1 % in.",
   "ids": [
    "SIG-005",
    "SIG-009",
    "SIG-010"
   ],
   "difference": "added"
  },
  {
   "id": "D-160",
   "topic": "impedances",
   "statement": "Typical summing-input circuit: 47k is a common value, giving sensitivity 1. Factory input and feedback resistors are normally in the 100k range (~47k…220k). Mixers use 100k.",
   "doepfer_kind": "typical",
   "sources": [
    "a100-diy-htm"
   ],
   "eis": "EIS makes the input load binding at 100 kΩ typical and at least 47 kΩ on every class but VIDEO.",
   "ids": [
    "SIG-005"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-169",
   "topic": "use, handling, and documents",
   "statement": "Fitting procedure: total the currents, unplug mains, fit the cable at the module (colored wire down), then at the nearest bus position (colored wire down), screw in, close gaps, power up and test. If anything is wrong, disconnect immediately.",
   "doepfer_kind": "rule",
   "sources": [
    "a100m-e-htm",
    "a100-short-form-manual-2025-pdf"
   ],
   "eis": "EIS requires the installer to keep each rail's published currents within every source, bus board, and outlet limit; the fitting steps of clause 9, with the marked conductor on −12 V, are informative.",
   "ids": [
    "ASM-001",
    "BUS-004"
   ],
   "difference": "tightened"
  },
  {
   "id": "D-171",
   "topic": "use, handling, and documents",
   "statement": "No Doepfer technical page exists for a \"flying bus board\", \"1U\" format or the \"Vintage Edition\". Vintage Edition differences are cosmetic only (black panel, KV knob).",
   "doepfer_kind": "not specified",
   "sources": [
    "a100z-e-htm"
   ],
   "eis": "EIS defines a 1U panel 39.65 mm high from the Intellijel format; flying bus boards appear only in the eis-reference survey, and the Vintage Edition is not mentioned.",
   "ids": [
    "PANEL-001",
    "PANEL-007",
    "PANEL-009"
   ],
   "difference": "added"
  }
 ]
}