Project N1201/2 8A Update

Worked for 41 sec

Regenerated from the current DRC-clean layout:

n12012-8a-gerbers.zip

n12012-8a-bom.csv

Designator	Quantity	Element UIDs	Part UID	Specification	Part Type	Role Details	Manufacturer Part Number	Manufacturer Name	Preferred Distributors	Voltage Rating	Resistance	Resistor Type	Tolerance	Capacitance	Capacitor Type	Power Rating	Inductance	Inductor Type	Package	Designator Prefix
C1B,C3B	2	314c89b0-1023-4ce8-b8d4-3962061501ff,cc1d5c56-17e6-4143-b411-72939996daff	46707925-236f-106b-e676-afa2757aa1d6	Non-Polarized Capacitor, 11uF, CP_Radial_D18.0mm_P7.50mm	Non-Polarized Capacitor	Solen PB1100 11uF 400V film capacitor, physical parallel half of C3 21uF position,Solen PB1100 11uF 400V film capacitor, physical parallel half of C1 21uF position	PB1100	Solen		400V			%	11uF	Film				CP_Radial_D18.0mm_P7.50mm	C
C1,C3	2	7b187c80-a127-4c71-934c-bf656b521d82,f700680d-f624-48a9-b4a9-c1286856b674	46707925-236f-106b-e676-afa2757aa1d6	Non-Polarized Capacitor, 10uF, CP_Radial_D18.0mm_P7.50mm	Non-Polarized Capacitor	Dayton Audio PMPC-10 10uF 250V film capacitor, physical parallel half of former C1 21uF position with C1B/Solen PB1100,Dayton Audio PMPC-10 10uF 250V film capacitor, physical parallel half of former C3 21uF position with C3B/Solen PB1100	PMPC-10	Dayton Audio		250V			%	10uF	Film				CP_Radial_D18.0mm_P7.50mm	C
C2	1	97a1503e-35f1-40c8-948c-a4554168df3a	46707925-236f-106b-e676-afa2757aa1d6	Non-Polarized Capacitor, 16uF, CP_Radial_D18.0mm_P7.50mm	Non-Polarized Capacitor	Solen 16uF 400V polypropylene capacitor, Parts Express #027-578	027-578	Solen		400V			%	16uF	Film				CP_Radial_D18.0mm_P7.50mm	C
C4	1	9c1f604f-e1b3-4fac-898d-d7ba9f462b52	46707925-236f-106b-e676-afa2757aa1d6	Non-Polarized Capacitor, 6.2uF, CP_Radial_D18.0mm_P7.50mm	Non-Polarized Capacitor	Dayton Audio PMPC-6.2 6.2uF 250V precision audio capacitor used for nominal 6uF position	PMPC-6.2	Dayton Audio		250V			%	6.2uF	Film				CP_Radial_D18.0mm_P7.50mm	C
L1	1	c023da19-7c5c-4a87-af3a-c031b6b68851	181603df-1db7-f7c0-4144-8e265bcbee99	Inductor, 0.3mH, SMD_0603_1608Metric	Inductor	Dayton Audio LW14-30, 0.30mH, 14 AWG air-core coil; nominal body diameter 47 mm and height 28.5 mm.	LW14-30	Dayton Audio									0.3mH	Fixed	SMD_0603_1608Metric	L
L2	1	01529f73-0e61-475b-b2d6-99e906a6f7fc	181603df-1db7-f7c0-4144-8e265bcbee99	Inductor, 2.7mH, SMD_0603_1608Metric	Inductor	Jantzen Audio 2.7 mH 15 AWG air-core inductor; Parts Express Part #255-434; 0.59 ohm DCR; 60 x 60 mm body	000-1802	Jantzen Audio	Parts Express				3%				2.7mH	15 AWG air-core crossover inductor	SMD_0603_1608Metric	L
L3	1	dcfdba6e-a0a6-4adf-9fb5-bfffc2ed449e	181603df-1db7-f7c0-4144-8e265bcbee99	Inductor, 0.80mH, SMD_0603_1608Metric	Inductor	Dayton Audio LW14-80, 0.80mH, 14 AWG air-core coil; nominal body diameter 59 mm and height 27 mm.	LW14-80	Dayton Audio									0.80mH	Fixed	SMD_0603_1608Metric	L
R1,R3	2	54394cda-a13a-4622-9ca5-acf6e848112f,600ce474-c9d0-4d1a-b663-0e4f07ab2356	b67f50a9-ae5e-10ea-9c3c-d377e2ab3b2d	Resistor, 2.0ohm, H_AXIAL-P25.4_D_3.2	Resistor	Dayton Audio DNR-2.0 2 Ohm 10W non-inductive wirewound resistor	DNR-2.0	Dayton Audio		V	2.0ohm	Wirewound	%			10W			H_AXIAL-P25.4_D_3.2	R
R2,R5	2	2f4d238e-9a4a-4d1f-9118-15a8b4f3714a,5d97e226-c50c-49e4-88d9-024308e607bb	b67f50a9-ae5e-10ea-9c3c-d377e2ab3b2d	Resistor, 3.0ohm, H_AXIAL-P25.4_D_3.2	Resistor	Dayton Audio DNR-3.0 3 Ohm 10W Precision Audio Grade Resistor, sourced at Parts Express	DNR-3.0	Dayton Audio		V	3.0ohm	Wirewound	%			10W			H_AXIAL-P25.4_D_3.2	R
R4	1	66e412b3-043e-4517-80be-a388f4ddf6de	b67f50a9-ae5e-10ea-9c3c-d377e2ab3b2d	Resistor, 3.9ohm, H_AXIAL-P25.4_D_3.2	Resistor	Jantzen Audio 3.90 Ohm 10W Audio-Grade Superes Resistor, Parts Express #255-948	255-948	Jantzen Audio		V	3.9ohm	Wirewound	%			10W			H_AXIAL-P25.4_D_3.2	R
R6	1	8ec0e71d-6992-48cb-86d7-54f3ade7a0e8	b67f50a9-ae5e-10ea-9c3c-d377e2ab3b2d	Resistor, 30ohm, H_AXIAL-P25.4_D_3.2	Resistor	Dayton Audio DNR-30 30 Ohm 10W Wirewound Resistor, sourced at Parts Express	DNR-30	Dayton Audio		V	30ohm	Wirewound	%			10W			H_AXIAL-P25.4_D_3.2	R

n12012-8a-bom-pcbway.csv

Item #	Designator	Qty	Manufacturer	Mfg Part #	Description / Value	Package/Footprint
1	C1B,C3B	2	Solen	PB1100	Non-Polarized Capacitor, 11uF, CP_Radial_D18.0mm_P7.50mm	CP_Radial_D18.0mm_P7.50mm
2	C1,C3	2	Dayton Audio	PMPC-10	Non-Polarized Capacitor, 10uF, CP_Radial_D18.0mm_P7.50mm	CP_Radial_D18.0mm_P7.50mm
3	C2	1	Solen	027-578	Non-Polarized Capacitor, 16uF, CP_Radial_D18.0mm_P7.50mm	CP_Radial_D18.0mm_P7.50mm
4	C4	1	Dayton Audio	PMPC-6.2	Non-Polarized Capacitor, 6.2uF, CP_Radial_D18.0mm_P7.50mm	CP_Radial_D18.0mm_P7.50mm
5	L1	1	Dayton Audio	LW14-30	Inductor, 0.3mH, SMD_0603_1608Metric	SMD_0603_1608Metric
6	L2	1	Jantzen Audio	000-1802	Inductor, 2.7mH, SMD_0603_1608Metric	SMD_0603_1608Metric
7	L3	1	Dayton Audio	LW14-80	Inductor, 0.80mH, SMD_0603_1608Metric	SMD_0603_1608Metric
8	R1,R3	2	Dayton Audio	DNR-2.0	Resistor, 2.0ohm, H_AXIAL-P25.4_D_3.2	H_AXIAL-P25.4_D_3.2
9	R2,R5	2	Dayton Audio	DNR-3.0	Resistor, 3.0ohm, H_AXIAL-P25.4_D_3.2	H_AXIAL-P25.4_D_3.2
10	R4	1	Jantzen Audio	255-948	Resistor, 3.9ohm, H_AXIAL-P25.4_D_3.2	H_AXIAL-P25.4_D_3.2
11	R6	1	Dayton Audio	DNR-30	Resistor, 30ohm, H_AXIAL-P25.4_D_3.2	H_AXIAL-P25.4_D_3.2

n12012-8a-bom-jlcpcb.csv

Comment	Designator	Footprint
PB1100	C1B, C3B	CP_Radial_D18.0mm_P7.50mm
PMPC-10	C1, C3	CP_Radial_D18.0mm_P7.50mm
027-578	C2	CP_Radial_D18.0mm_P7.50mm
PMPC-6.2	C4	CP_Radial_D18.0mm_P7.50mm
LW14-30	L1	SMD_0603_1608Metric
000-1802	L2	SMD_0603_1608Metric
LW14-80	L3	SMD_0603_1608Metric
DNR-2.0	R1, R3	H_AXIAL-P25.4_D_3.2
DNR-3.0	R2, R5	H_AXIAL-P25.4_D_3.2
255-948	R4	H_AXIAL-P25.4_D_3.2
DNR-30	R6	H_AXIAL-P25.4_D_3.2

Verify drill files

Review mounting duplicates

Update assembly checklist

Create bring-up plan

Files

Schematic

Layout

Preview

N1201/2 8A Capture Notes

Source attachments received

BOM/schematic text attachment: pasted-text-1783015592618.txt
Coil orientation/assembly text attachment: pasted-text-1783015607836.txt

BOM from attachment

Table

Ref	Value / specification	Notes
C1	21 uF film capacitor	Paralleled pairs such as 10 uF + 11 uF acceptable
C2	16 uF film capacitor	Metallized polypropylene / audio grade
C3	21 uF film capacitor	High-frequency EQ section
C4	6 uF film capacitor	High-frequency bypass
L1	0.3 mH inductor	Low DCR air core or heavy-gauge iron core
L2	2.7 mH inductor	Heavy-gauge steel/iron core for woofer, low DCR
L3	0.77 mH inductor	Air core preferred for high frequencies
R1, R3	2 ohm resistor	Wirewound, 10 W to 25 W minimum
R2, R5	3 ohm resistor	Wirewound, 10 W to 25 W minimum
R4	3.9 ohm resistor	Wirewound, 10 W to 25 W minimum
R6	30 ohm resistor	Wirewound, 10 W to 25 W minimum
HF L-pad	AT-50H	Remote-mounted on separate control panel; 14 AWG leads attach to board
MF L-pad	AT-50H	Remote-mounted on separate control panel; 14 AWG leads attach to board
Binding posts	4 sets total	Two input pairs LF/HF, two output pairs woofer/horn

Provisional schematic topology from attachment

LF section

LF input positive feeds L1 0.3 mH series, then L2 2.7 mH series, then Woofer positive.
C1 21 uF shunts from the node between L1 and L2 to LF negative / Woofer negative.
LF negative connects directly to Woofer negative.

HF section

HF input positive feeds C2 16 uF series to node A.
Node A branches into two EQ/bypass paths that rejoin at node B:
- C3 21 uF series with L3 0.77 mH.
- C4 6 uF series with R4 3.9 ohm.
Node B feeds R1 2 ohm series, then R2 3 ohm series, then L-pad input node.
L-pad/output network shown with R3 2 ohm, R5 3 ohm, R6 30 ohm, and P1 marked 25 ohm / HF level pot in the pasted schematic.
HF negative is common return to Horn negative.

Confirmed control-panel update

L-pads are AT-50H parts.
L-pads break out to a separate control panel rather than mounting directly on the crossover board.
Provide board connection points / lead pads for 14 AWG wiring to the remote L-pads.
There will be one HF adjustment L-pad and one MF adjustment L-pad; both break out to the separate control panel with 14 AWG leads.
BOM quantity is two AT-50H L-pads per crossover.
This supersedes the earlier provisional sketch label of P1 as 25 ohm.

Sourced resistor parts added 2026-07-07

R2 and R5: Dayton Audio DNR-3.0, 3 ohm 10 W Precision Audio Grade Resistor, Parts Express.
R4: Jantzen Audio 3.90 ohm 10 W Audio-Grade Superes Resistor, Parts Express #255-948.
R6: Dayton Audio DNR-30, 30 ohm 10 W wirewound resistor, Parts Express.

Confirmed PCB implementation

Build as a manufacturable routed PCB, not only a hand-wired assembly board.
Use large 14 AWG solder points on the PCB for leads going to both remote AT-50H L-pads: HF and MF.
Route all crossover nets on the PCB where practical; unresolved airwires are not acceptable for final manufacturing output.
J1-J6 are custom PCB solder pads, not purchased connector parts, and should be excluded from the purchased BOM.
External L-pad BOM item: Speaker L-Pad Attenuator 50W Mono, 3/8 inch shaft, 8 ohm, Parts Express #260-252 / AT-50H; quantity 2 per crossover.

Clarification needed before final schematic capture

Confirm exact AT-50H terminal wiring by ohmmeter before final assembly: input terminal, output/wiper terminal, and return/shunt terminal.
Confirm whether LF/HF inputs remain separate bi-amp/bi-wire inputs or should be tied for single input operation.
MF L-pad breakout is required the same way as the HF L-pad breakout.

Assembly / layout rules from attachment

L2 2.70 mH large woofer coil: lay flat on board, spool opening points up/down.
L1 0.30 mH small woofer coil: stand vertically, center hole oriented left/right.
L3 0.77 mH horn EQ coil: stand vertically, rotated 90 degrees from L1, center hole oriented front/back.
Keep at least 4 inches clear space between physical edges of L2 and L1.
Use non-ferrous inductor fasteners: nylon zip ties, high-temp hot glue, 100% silicone adhesive, or brass screws. Avoid steel/iron screws.
Mount wirewound resistors elevated slightly off the board and away from capacitors for heat clearance.
Keep remote control-panel L-pads clearly separated from board-mounted crossover passives in schematic, layout notes, and wiring documentation.
PCB layout must allow high-current speaker traces and adequate clearance around hot wirewound resistors and large inductors.

PCB physical footprint correction added 2026-07-14

C1 and C3 were split into real parallel BOM/PCB parts: C1/C3 = Dayton PMPC-10 10 uF, C1B/C3B = Solen PB1100 11 uF.
Generic 0603 placeholders were converted to through-hole lead pads for the film capacitors, 10 W wirewound resistors, and inductors.
J1-J6 are 7 mm custom through-hole solder pads with 2.2 mm holes for 14 AWG leads.
Public nominal body outlines added on top silkscreen: PMPC-10 45 x 22 mm, PB1100 38 x 28 mm, Solen 16 uF 45 x 29 mm, PMPC-6.2 31 x 22 mm, Dayton DNR resistors 48 x 10 mm, Jantzen R4 33 x 8.5 mm, LW14-30 47 x 28.5 mm, LW14-80 59 x 27 mm.
L2 SL2.7-18AWG dimensions are least certain: Madisound confirms the part but does not publish a clean mechanical drawing. The PCB uses a conservative large outline based on the closest public data; verify against the purchased coil before fabrication.

PCB mechanical correction added 2026-07-14

J1-J6 were moved visibly inboard and enlarged to 8 mm through-hole solder pads with 2.6 mm drill holes for 14 AWG bare wire insertion.
J1-J6 have explicit top silkscreen labels identifying 14 AWG solder pad function.
Added 3.2 mm non-plated zip-tie holes around L1, L2, L3, and the large C1/C1B and C3/C3B film-capacitor stacks.
Copper was cleared and rerouted after these mechanical changes so routing respects the relocated solder pads and new tie-down holes.

Source attachments received
BOM from attachment
Provisional schematic topology from attachment
LF section
HF section
Confirmed control-panel update
Sourced resistor parts added 2026-07-07
Confirmed PCB implementation
Clarification needed before final schematic capture
Assembly / layout rules from attachment
PCB physical footprint correction added 2026-07-14
PCB mechanical correction added 2026-07-14