Op-Amp Summing/Integrator/Differentiator Designer implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-246

Effect

Computation or source lookup only

Input and validation requirements

A zero input resistance produces an undefined division and should be rejected. The specification also leaves signed-voltage versus magnitude conventions unstated, allowing a polarity error in the computed output.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "mode": "summing",
    "Rf_ohm": 100000,
    "V1_V": 0.25,
    "R1_ohm": 25000,
    "V2_V": -0.1,
    "R2_ohm": 50000
  },
  "expected_outputs": {
    "Vout_V": -0.8
  },
  "working": "V1/R1 = 0.25/25000 = 0.00001 A = 10 microA. V2/R2 = -0.1/50000 = -0.000002 A = -2 microA. Sum = 10 microA - 2 microA = 8 microA. Vout = -Rf times sum = -100000 ohm times 0.000008 A = -0.8 V."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json