You're building a current-sense stage and the inductance in your shunt is throwing off the readings at higher frequencies, or the temp drift is making your calibration a moving target. This Welwyn open-air PCB mount shunt sits at 0.01 ohm with a tight ±1% tolerance and extremely low temperature drift. Handles up to about 20 amps. Low inductance by design. You drop it on the board, calibrate once, and it stays put. No guessing, no re-trimming every time the room warms up
| brand | Jaycar |
| manufacturer | Welwyn |
| model | OAR3-R010FI |
| resistance | 0.01 ohm (10 mΩ) |
| power_rating | 3 W |
| tolerance | ±1% |
| type | Open-air PCB mount current shunt/sense resistor |
| max_current_approx | ~20 A |
| dimensions | 15.2 mm (L) × 25.4 mm (H) |
| inductance_characteristic | Low inductance |
| temperature_drift | Extremely low |
| category | Electronic Components |