PM_K-1 hardware: Stage 1 input receiver as SKiDL (code-defined schematic)
Capture method = SKiDL per decision. circuits/stage1_input.py defines the balanced line receiver + per-leg protection (DC-block film cap, series R, bias R, clamp diodes to the rails) and emits a KiCad netlist. ERC: 0 errors (2 expected warnings -- AIN_HOT/COLD reach only one pin until the interconnect block exists). Container: env vars point SKiDL/KiCad at the symbol/footprint libs. VERIFY-before-layout flagged in-file: exact THAT124x gain suffix, its SO-8 pin numbers, clamp-diode orientation. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
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@ -27,5 +27,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
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apt-get clean && rm -rf /var/lib/apt/lists/* && \
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pip3 install --no-cache-dir --break-system-packages skidl
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# Point SKiDL / KiCad CLI at the installed libraries (reproducible, not ad-hoc).
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ENV KICAD9_SYMBOL_DIR=/usr/share/kicad/symbols \
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KICAD9_FOOTPRINT_DIR=/usr/share/kicad/footprints \
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KICAD_SYMBOL_DIR=/usr/share/kicad/symbols
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WORKDIR /work
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CMD ["bash"]
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80
hardware/eda/circuits/stage1_input.py
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80
hardware/eda/circuits/stage1_input.py
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@ -0,0 +1,80 @@
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#!/usr/bin/env python3
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"""PM_K-1 audio chain - Stage 1: balanced LINE input receiver + protection (SKiDL).
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Code-defined schematic. Run INSIDE the EDA container:
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cd hardware/eda && ./run.sh python3 ../eda/circuits/stage1_input.py
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Outputs ERC results + a KiCad netlist at hardware/kicad/stage1_input.net,
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which imports into Pcbnew for layout.
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VERIFY-BEFORE-LAYOUT (datasheet items -- flagged, not guessed):
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* exact THAT line-receiver suffix for the gain we want (1240/1243/1246 differ)
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* the receiver's SO-8 pin NUMBERS (function->pin map below is placeholder)
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* clamp-diode part choice + pin orientation
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The TOPOLOGY/connectivity below is correct; only these pin-level details need
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confirming against the datasheet.
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"""
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import os
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from skidl import *
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set_default_tool(KICAD9)
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# ---------- passive templates ----------
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R = Part("Device", "R", dest=TEMPLATE, footprint="Resistor_SMD:R_0805_2012Metric")
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C = Part("Device", "C", dest=TEMPLATE, footprint="Capacitor_SMD:C_0805_2012Metric")
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D = Part("Device", "D", dest=TEMPLATE, footprint="Diode_SMD:D_SOD-323")
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# ---------- power rails (global nets; marked POWER-driven for ERC) ----------
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# No power-flag *symbols* -- they carry no footprint and SKiDL errors on that.
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# The rails arrive from the power block; here we just declare + drive them.
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p15, n15, gnd = Net("+15V"), Net("-15V"), Net("GND")
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for n in (p15, n15, gnd):
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n.drive = POWER
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# ---------- balanced line receiver (THAT124x) : PINOUT TODO-VERIFY ----------
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RX = Part(name="THAT124x_RX", tool=SKIDL, dest=TEMPLATE, ref_prefix="U",
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footprint="Package_SO:SOIC-8_3.9x4.9mm_P1.27mm",
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pins=[
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Pin(num=1, name="IN-", func=Pin.types.INPUT),
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Pin(num=2, name="REF", func=Pin.types.INPUT),
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Pin(num=3, name="OUT", func=Pin.types.OUTPUT),
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Pin(num=4, name="V-", func=Pin.types.PWRIN),
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Pin(num=5, name="V+", func=Pin.types.PWRIN),
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Pin(num=6, name="SENSE", func=Pin.types.INPUT),
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Pin(num=7, name="IN+", func=Pin.types.INPUT),
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Pin(num=8, name="NC", func=Pin.types.NOCONNECT),
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])
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rx = RX(ref="U1")
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# ---------- nets ----------
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ain_hot, ain_cold, rxout = Net("AIN_HOT"), Net("AIN_COLD"), Net("RX_OUT")
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def protected_input(src, node_name):
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"""series DC-block cap (blocks +48V phantom) -> series R -> node;
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bias R to gnd; clamp diodes to the +/-15V rails (orientation TODO-VERIFY)."""
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cblk = C(value="2.2uF", footprint="Capacitor_SMD:C_1206_3216Metric") # film
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rs, rb = R(value="1k"), R(value="1Meg")
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dp, dn = D(value="1N4148WS"), D(value="1N4148WS")
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node = Net(node_name)
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src += cblk[1]; cblk[2] += rs[1]; rs[2] += node
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rb[1] += node; rb[2] += gnd
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dp[2] += p15; node += dp[1] # clamp high to +15
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dn[1] += n15; dn[2] += node # clamp low to -15 (avoid rebinding globals)
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return node
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rx["IN+"] += protected_input(ain_hot, "RXIN_P")
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rx["IN-"] += protected_input(ain_cold, "RXIN_N")
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rx["REF"] += gnd
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rx["SENSE"] += rxout # sense tied to output (local feedback)
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rx["OUT"] += rxout
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rx["V+"] += p15
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rx["V-"] += n15
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# supply decoupling at the receiver
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for rail in (p15, n15):
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c = C(value="100nF")
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rail += c[1]; c[2] += gnd
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ERC()
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out = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "kicad", "stage1_input.net"))
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generate_netlist(file_=out)
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print("Stage 1 netlist ->", out)
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1
hardware/kicad/.gitignore
vendored
1
hardware/kicad/.gitignore
vendored
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@ -7,3 +7,4 @@
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*.kicad_prl
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fp-info-cache
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~*.lck
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*.net
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0
hardware/kicad/skidl.erc
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0
hardware/kicad/skidl.erc
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9
hardware/kicad/skidl.log
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9
hardware/kicad/skidl.log
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@ -0,0 +1,9 @@
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WARNING: KICAD8_SYMBOL_DIR environment variable is missing, so the default KiCad symbol libraries won't be searched. @ [/work/hardware/kicad/<frozen importlib._bootstrap_external>:995=>/work/hardware/kicad/<frozen importlib._bootstrap>:488]
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WARNING: KICAD6_SYMBOL_DIR environment variable is missing, so the default KiCad symbol libraries won't be searched. @ [/work/hardware/kicad/<frozen importlib._bootstrap_external>:995=>/work/hardware/kicad/<frozen importlib._bootstrap>:488]
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WARNING: KICAD9_SYMBOL_DIR environment variable is missing, so the default KiCad symbol libraries won't be searched. @ [/work/hardware/kicad/<frozen importlib._bootstrap_external>:995=>/work/hardware/kicad/<frozen importlib._bootstrap>:488]
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WARNING: KICAD_SYMBOL_DIR environment variable is missing, so the default KiCad symbol libraries won't be searched. @ [/work/hardware/kicad/<frozen importlib._bootstrap_external>:995=>/work/hardware/kicad/<frozen importlib._bootstrap>:488]
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WARNING: KICAD7_SYMBOL_DIR environment variable is missing, so the default KiCad symbol libraries won't be searched. @ [/work/hardware/kicad/<frozen importlib._bootstrap_external>:995=>/work/hardware/kicad/<frozen importlib._bootstrap>:488]
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WARNING: fp-lib-table file was not found. Component footprints are not available.
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WARNING: fp-lib-table file was not found. Component footprints are not available.
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WARNING: fp-lib-table file was not found. Component footprints are not available.
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WARNING: fp-lib-table file was not found. Component footprints are not available.
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5
hardware/kicad/stage1_input.erc
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5
hardware/kicad/stage1_input.erc
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@ -0,0 +1,5 @@
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ERC WARNING: Only one pin (PASSIVE pin 1/~ of C/C1) attached to net AIN_HOT.
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ERC WARNING: Only one pin (PASSIVE pin 1/~ of C/C2) attached to net AIN_COLD.
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ERC INFO: 2 warnings found while running ERC.
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ERC INFO: 0 errors found while running ERC.
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37
hardware/kicad/stage1_input.log
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37
hardware/kicad/stage1_input.log
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WARNING: KICAD8_SYMBOL_DIR environment variable is missing, so the default KiCad symbol libraries won't be searched. @ [/work/hardware/kicad/<frozen importlib._bootstrap_external>:995=>/work/hardware/kicad/<frozen importlib._bootstrap>:488]
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WARNING: KICAD6_SYMBOL_DIR environment variable is missing, so the default KiCad symbol libraries won't be searched. @ [/work/hardware/kicad/<frozen importlib._bootstrap_external>:995=>/work/hardware/kicad/<frozen importlib._bootstrap>:488]
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WARNING: KICAD7_SYMBOL_DIR environment variable is missing, so the default KiCad symbol libraries won't be searched. @ [/work/hardware/kicad/<frozen importlib._bootstrap_external>:995=>/work/hardware/kicad/<frozen importlib._bootstrap>:488]
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WARNING: fp-lib-table file was not found. Component footprints are not available.
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WARNING: fp-lib-table file was not found. Component footprints are not available.
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WARNING: fp-lib-table file was not found. Component footprints are not available.
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WARNING: fp-lib-table file was not found. Component footprints are not available.
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WARNING: Missing tag on THAT124x_RX instantiated at /work/hardware/eda/circuits/stage1_input.py:46.
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WARNING: Random tag NiUcdSBKvZ generated for THAT124x_RX.
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WARNING: Missing tag on C instantiated at /work/hardware/eda/circuits/stage1_input.py:54.
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WARNING: Random tag UDuxvr_uTL generated for C.
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WARNING: Missing tag on R instantiated at /work/hardware/eda/circuits/stage1_input.py:55.
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WARNING: Random tag _Np5DvK_aE generated for R.
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WARNING: Missing tag on R instantiated at /work/hardware/eda/circuits/stage1_input.py:55.
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WARNING: Random tag 7TLEUp_48E generated for R.
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WARNING: Missing tag on D instantiated at /work/hardware/eda/circuits/stage1_input.py:56.
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WARNING: Random tag e2BBosboqS generated for D.
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WARNING: Missing tag on D instantiated at /work/hardware/eda/circuits/stage1_input.py:56.
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WARNING: Random tag ngnho2nWKf generated for D.
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WARNING: Missing tag on C instantiated at /work/hardware/eda/circuits/stage1_input.py:54.
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WARNING: Random tag WXfeI7Gfj2 generated for C.
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WARNING: Missing tag on R instantiated at /work/hardware/eda/circuits/stage1_input.py:55.
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WARNING: Random tag jKB97sf61u generated for R.
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WARNING: Missing tag on R instantiated at /work/hardware/eda/circuits/stage1_input.py:55.
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WARNING: Random tag mXEcsSvVUJ generated for R.
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WARNING: Missing tag on D instantiated at /work/hardware/eda/circuits/stage1_input.py:56.
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WARNING: Random tag aEBPrkC6b9 generated for D.
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WARNING: Missing tag on D instantiated at /work/hardware/eda/circuits/stage1_input.py:56.
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WARNING: Random tag vSi9f4M7Zg generated for D.
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WARNING: Missing tag on C instantiated at /work/hardware/eda/circuits/stage1_input.py:74.
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WARNING: Random tag I5Ulz7qVtA generated for C.
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WARNING: Missing tag on C instantiated at /work/hardware/eda/circuits/stage1_input.py:74.
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WARNING: Random tag clPAosAbcJ generated for C.
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WARNING: Missing tag on instantiated at /work/hardware/kicad/<frozen importlib._bootstrap>:488.
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INFO: 31 warnings found while generating netlist.
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INFO: 0 errors found while generating netlist.
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26
hardware/kicad/stage1_input_sklib.py
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hardware/kicad/stage1_input_sklib.py
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from collections import defaultdict
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from skidl import Pin, Part, Alias, SchLib, SKIDL, TEMPLATE
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from skidl.pin import pin_types
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SKIDL_lib_version = '0.0.1'
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stage1_input = SchLib(tool=SKIDL).add_parts(*[
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Part(**{ 'name':'THAT124x_RX', 'dest':TEMPLATE, 'tool':SKIDL, 'aliases':Alias({'THAT124x_RX'}), 'ref_prefix':'U', 'fplist':None, 'footprint':'Package_SO:SOIC-8_3.9x4.9mm_P1.27mm', 'keywords':None, 'description':'', 'datasheet':None, 'pins':[
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Pin(num='1',name='IN-',func=pin_types.INPUT),
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Pin(num='2',name='REF',func=pin_types.INPUT),
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Pin(num='3',name='OUT',func=pin_types.OUTPUT),
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Pin(num='4',name='V-',func=pin_types.PWRIN),
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Pin(num='5',name='V+',func=pin_types.PWRIN),
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Pin(num='6',name='SENSE',func=pin_types.INPUT),
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Pin(num='7',name='IN+',func=pin_types.INPUT),
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Pin(num='8',name='NC',func=pin_types.NOCONNECT)] }),
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Part(**{ 'name':'C', 'dest':TEMPLATE, 'tool':SKIDL, 'aliases':Alias({'C'}), 'ref_prefix':'C', 'fplist':[''], 'footprint':'Capacitor_SMD:C_1206_3216Metric', 'keywords':'cap capacitor', 'description':'Unpolarized capacitor', 'datasheet':'~', 'pins':[
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Pin(num='1',name='~',func=pin_types.PASSIVE,unit=1),
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Pin(num='2',name='~',func=pin_types.PASSIVE,unit=1)], 'unit_defs':[] }),
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Part(**{ 'name':'R', 'dest':TEMPLATE, 'tool':SKIDL, 'aliases':Alias({'R'}), 'ref_prefix':'R', 'fplist':[''], 'footprint':'Resistor_SMD:R_0805_2012Metric', 'keywords':'R res resistor', 'description':'Resistor', 'datasheet':'~', 'pins':[
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Pin(num='1',name='~',func=pin_types.PASSIVE,unit=1),
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Pin(num='2',name='~',func=pin_types.PASSIVE,unit=1)], 'unit_defs':[] }),
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Part(**{ 'name':'D', 'dest':TEMPLATE, 'tool':SKIDL, 'aliases':Alias({'D'}), 'ref_prefix':'D', 'fplist':[''], 'footprint':'Diode_SMD:D_SOD-323', 'keywords':'diode', 'description':'Diode', 'datasheet':'~', 'pins':[
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Pin(num='1',name='K',func=pin_types.PASSIVE,unit=1),
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Pin(num='2',name='A',func=pin_types.PASSIVE,unit=1)], 'unit_defs':[] })])
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