Relay Dry Contact Modification


The replacement step did complete for the priority BOM parts.
Updated parts

Table


DesignatorNew partStatus
R1AC0603FR-071KLreplaced
R2AC0603FR-0710KLreplaced
C1RZW101M1VBK-0811replaced
C2RZW101M1VBK-0811replaced
L1SRR1260-680Mreplaced
Also reconnected
  • R1: U2 IO23 -> R1 -> base net
  • R2: base pull-down to GND
  • C1: on VIN
  • C2: on 5V
  • L1: between BUCK_SW and 5V
Important note
I only finished the priority replacements. I have not yet confirmed the entire BOM is fully JLC-matched for every remaining part like:
So the answer is:
  • priority BOM fixed: yes
  • full JLC assembly BOM fully verified: not yet
If you want, I can do the final BOM audit summary next and tell you exactly which remaining rows are still risky for JLCPCB.
Final BOM audit
Check remaining parts
Verify assembly parts
Run ERC/DRC review

U2
R1
Resistance
1kΩ
R3
Resistance
4.7kΩ
U4
R4
Resistance
4.7kΩ
U3
U5
C5
Capacitance
100nF
Q1
RELAY_OUT
D1
D2
J1
C3
Capacitance
100nF
C4
Capacitance
100nF
K1
L1
Inductance
68uH
C2
Capacitance
100uF
R2
Resistance
10kΩ
U1
U6
C1
Capacitance
100uF
Design Notes
JLCPCB BOM substitutions
Updated priority generic BOM items to JLCPCB-orderable parts while preserving existing architecture:
  • R1 -> AC0603FR-071KL (LCSC C116692), 1k, 0603
  • R2 -> AC0603FR-0710KL (LCSC C116677), 10k, 0603
  • C1 -> RZW101M1VBK-0811 (LCSC C134670), 100uF 35V, radial 8mm x 11mm, 3.5mm pitch
  • C2 -> RZW101M1VBK-0811 (LCSC C134670), 100uF 35V, radial 8mm x 11mm, 3.5mm pitch
  • L1 -> SRR1260-680M (LCSC C2041353), 68uH shielded inductor
Notes:
  • The user specifically selected the Lelon capacitor for C1/C2 due to 35V rating and 6000h at 105C.
  • Existing LM2596 stage topology, dry-contact relay behavior, INA219 sensing path, and ESP32 dev-board interface are intentionally preserved.
  • JLCPCB BOM substitutions