PCB Unrouting Verification
Route all unrouted nets on this PCB
Thought for 4 sec
I’ll check the current PCB connectivity, route any remaining airwires, then verify the board is fully routed.
Thought for 1 min 7 sec
The PCB is already fully routed: DRC reports no airwires or routing-related errors, and the routing pre-check returned “nothing to route.”
Open items:
- None for routing.
Suggested next steps:
- Run a full design review before manufacturing.
- Export Gerbers/BOM/pick-and-place when ready.
- Add board labels or polarity markings if needed.
Review, export, label
Run full review
Add polarity labels
Check manufacturability
Export files
Refine this doc
Ask about this doc
Board Bring-Up Plan — 9V 555 LED Blinker
Purpose
Validate a hand-solderable NE555 astable circuit powered by a 9V block battery through an on/off switch. Expected behavior: red LED blinks approximately once per second.
Pre-Power Checks
- Inspect solder joints on U1, SW1, J1, D1, R1-R3, and C1-C4.
- Confirm U1 is installed as a DIP-8 NE555P with pin 1 orientation correct.
- Confirm D1 polarity: anode goes to R3, cathode goes to GND.
- Confirm C4 polarity if an electrolytic capacitor is fitted; C1-C3 are non-polarized disc capacitors in this design.
- With the battery disconnected and switch OFF, check for shorts between VCC_SW and GND.
First Power-Up
- Connect 9V battery snap leads to J1: J1 pin 1 is battery positive, J1 pin 2 is battery negative/GND.
- Set SW1 ON.
- Measure VCC_SW to GND: expect roughly battery voltage, typically 7V-9.6V depending on battery condition.
- If current draw is excessive or U1 heats, switch OFF immediately.
Functional Checks
- D1 should blink at about 1.06 Hz using R1 = 1kΩ, R2 = 680kΩ, C1 = 1uF.
- Expected period is about 0.94 s; component tolerances may shift this noticeably.
- If LED stays off, check D1 polarity, R3, U1 OUT, and the switch wiring.
- If LED stays on, check C1, R2, and the U1 TRIG/THRES timing node.
Probe Points
- VCC_SW: U1 VCC pin or C3/C4 positive side.
- GND: J1 pin 2 or U1 GND pin.
- Timing node: U1 TRIG/THRES / C1 positive side should ramp between about 1/3 and 2/3 of VCC.
- Output: U1 OUT should toggle high/low and drive R3/D1.
Notes
- The library did not include a dedicated 9V snap connector, so the schematic uses a 2-pin screw terminal for the 9V battery snap leads.
- Passives are configured as through-hole footprints for easier hand soldering: axial resistors, disc capacitors for C1-C3, and radial electrolytic-style footprint for C4.
Purpose
Pre-Power Checks
First Power-Up
Functional Checks
Probe Points
Notes
