How the Engine Works
Adapter Guru runs on pure, transparent electrical engineering rules computed directly inside your browser. No black-box guesses, no tracking cookies, and zero server lag.
The 4 Sequential Validation Steps
Step 1: Voltage Strict Equivalence (ΔV = 0)
The engine compares Adapter Voltage against Device Voltage. If they differ, the check immediately flags an Incompatible State (Overvoltage or Undervoltage).
Step 2: Current Capacity (I_adapter ≥ I_device)
Current units are normalized to Amperes. If the adapter amperage is equal or greater, it passes with safety headroom notes. If lower, a Thermal Overload Warning is triggered.
Step 3: Polarity Alignment (⊕ vs ⊖)
Center Positive (⊕) and Center Negative (⊖) are compared. An inverted polarity match generates an immediate Electrical Hazard Warning.
Step 4: DC Barrel Plug Dimensions
Checks millimeter dimensions (OD × ID) and specifically alerts users to the loose 5.5×2.1mm vs 5.5×2.5mm center pin trap.
Test the engine yourself
Input your specifications and watch the engine evaluate all 6 safety parameters in real time.
Launch Compatibility Checker