Pulse Induction Metal Detector PCB Design

naz962

Proceed with final stabilization of the PCB design:

Grounding and validation:

Fix all grounding issues and enforce a strict single star-ground topology at the 12V input only
Ensure complete separation of analog, digital, and power return paths with no unintended coupling
Rerun full ERC and DRC after grounding corrections and resolve all remaining violations

Component placement:

Place the Arduino Nano centrally between the analog front-end (TL072 + LM393) and the power driver section (TC4420 + IRF3205 + coil)
Maintain clear physical separation between analog and power domains to minimize electromagnetic coupling

Power integrity:

Add bulk capacitors for each power domain:
- Analog domain: 10µF–47µF low-noise capacitor
- Digital domain: 10µF–47µF capacitor near Arduino Nano
- Power domain: 100µF–470µF near coil driver input
Ensure each bulk capacitor is placed close to its respective power entry point

Final review:

Re-check decoupling placement (100nF at every IC power pin)
Verify no routing crosses between analog and power zones
Confirm coil driver loop remains minimal and isolated

Only proceed to final Gerber, BOM, and Pick-and-Place generation after all checks pass successfully.

4 days

flux

0:59

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Plan

#Goal

Finalize and stabilize the pulse induction metal detector PCB to ensure strict single-point grounding at the 12V input, complete analog/digital/power domain separation, and proper component placement. This includes positioning the Arduino Nano centrally between the analog front-end and power driver, adding appropriate bulk capacitors per power domain, ensuring 100nF decoupling at each IC power pin, and verifying design integrity through ERC/DRC before generating manufacturing outputs (Gerber, BOM, and pick-and-place files).

#Implementation plan

Schematic and Layout Audit
1. Review the current schematic for meeting design separation and grounding requirements.
2. Verify that each IC power pin includes a 100nF decoupling capacitor.
3. Confirm that bulk capacitors are added to each separate power domain.
Grounding and Domain Separation Modifications
1. Enforce a strict single star-ground topology solely at the 12V input.
2. Maintain full separation of analog, digital, and power sections on both the schematic and PCB layout.
Component Placement Adjustments
1. Relocate the Arduino Nano to a central position between the analog front-end (e.g., TL072, LM393) and power driver section (TC4420, IRF3205) to optimize isolation between domains.
Design Rule Verification
1. Rerun ERC and DRC checks.
2. Address and resolve any grounding, trace width, clearance, or decoupling violations that appear.
Final Manufacturing Readiness
1. Verify that all changes meet the design requirements.
2. Generate and review Gerber, BOM, and pick-and-place outputs only after all checks pass.

#Success criteria

The schematic and PCB layout enforce a single star-ground connection at the 12V input with proper isolation between analog, digital, and power domains.
The Arduino Nano is centrally placed between the analog front-end and power driver on the PCB.
Every IC includes a 100nF decoupling capacitor with bulk capacitors present on each power domain.
ERC/DRC reports are clean with no remaining violations.
Manufacturing outputs (Gerber, BOM, and pick-and-place files) are generated only after a successful design review.

Fix grounding and checks

Place MCU between domains

Add bulk capacitors

4 days

Reviews

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
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Generic Inductor
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15.8k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
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1.2M
875105359001
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1.2M
CTL1206FYW1T
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Project Name

Pulse Induction Metal Detector 39d6

Description

Pulse induction metal detector using an Arduino Nano, TC4420-driven IRF3205 coil switch, TL072 analog gain stages, LM393 detection comparator, 12V input power, and buzzer alert, optimized for low-noise sensing and separated analog/power grounds.

Properties

Properties describe core aspects of the project.

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