Source: https://guthlabs.ai/docs/instruments/class-a-b-ab-amplifier-efficiency-dissipation-estimator/implementation/

instrument implementation / implementation-contract

# Class A/B/AB Amplifier Efficiency & Dissipation Estimator implementation

A source-bound implementation contract for Class A/B/AB Amplifier Efficiency & Dissipation Estimator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t5-219

**Effect**: Computation or source lookup only

## Input and validation requirements

A zero-load input produces an undefined output-power calculation and must be rejected. The Class A efficiency branch is also underspecified because the specification permits both 25% and 50% maxima, while signed versus magnitude output-power conventions produce materially different results.

## 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": {
    "class": "B",
    "supply_voltage_V": 24,
    "supply_current_A": 1,
    "output_power_W": 12,
    "load_ohm": 8
  },
  "expected_outputs": {
    "theoretical_max_efficiency_percent": 78.54,
    "actual_efficiency_percent": 50,
    "supply_power_W": 24,
    "dissipation_W": 12
  },
  "working": "Theoretical efficiency = (pi/4) x 100 = 0.785398 x 100 = 78.54%. Supply power = 24 V x 1 A = 24 W. Actual efficiency = 12 W / 24 W x 100 = 50%. Dissipation = 24 W - 12 W = 12 W."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/class-a-b-ab-amplifier-efficiency-dissipation-estimator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/class-a-b-ab-amplifier-efficiency-dissipation-estimator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/class-a-b-ab-amplifier-efficiency-dissipation-estimator/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`