Enter your pedals' power specs and a supply's outputs below. Everything the planner returns comes straight from pedal-power-planner.js's own rules: voltage must match exactly, polarity must match (an output that states none is taken as centre-negative — stated, not silently assumed), the current drawn from an output never exceeds its rating, and a pedal that needs an isolated output either gets one to itself or is not assigned. An unknown is never a zero — a pedal with no verified draw, voltage or polarity is excluded from every total and reported separately, never guessed at.
Worked example: a six-pedal board on a four-output supply
Here is exactly what the widget below computes for one fixed, invented board and one fixed, invented supply, before any JavaScript runs:
The pedals
| Pedal | Type | Voltage | Polarity | Draw | Notes |
|---|---|---|---|---|---|
| Route 9 Tuner | Tuner | 9 V | centre-negative | 3 mA | No DC jack — battery only |
| Steady Comp | Compressor | 9 V | centre-negative | 8 mA | — |
| Halcyon Fuzz | Fuzz | 9 V | centre-negative | 12 mA | — |
| Twin Chorus | Chorus | 9 V | centre-negative | — | No verified current draw |
| Night Owl Phaser | Phaser | 9 V | centre-negative | 45 mA | Digital |
| Tidepool Delay | Delay | 9 V | centre-negative | 120 mA | Digital |
The supply: "Anchorage 4"
| Output | Voltage | Rating | Isolated | Polarity |
|---|---|---|---|---|
| 1 | 9 V | 100 mA | Yes | centre-negative |
| 2 | 9 V | 100 mA | Yes | centre-negative |
| 3 | 9 V | 250 mA | No | centre-negative |
| 4 | 18 V | 250 mA | Yes | centre-negative |
The plan
| Output | Pedals | Used | Headroom | Daisy-chained |
|---|---|---|---|---|
| 1 (9 V, isolated) | Night Owl Phaser | 45 of 100 mA | 55 mA | No |
| 2 (9 V, isolated) | — (free) | 0 of 100 mA | 100 mA | No |
| 3 (9 V, shared) | Steady Comp, Halcyon Fuzz, Tidepool Delay | 140 of 250 mA | 110 mA | Yes |
| 4 (18 V, isolated) | — (no 9 V pedal fits an 18 V output) | 0 of 250 mA | 250 mA | No |
Two pedals are not assigned, each with a reason rather than a silent drop, quoted exactly as the planner states it: Route 9 Tuner — "This pedal has no DC jack: it runs on a battery and needs no output." Twin Chorus — "No verified current draw. It is excluded from every total rather than counted as 0 mA." That is the whole rule: an unknown draw is a floor on the totals above, never a guessed number standing in for the real one, until that figure comes from the maker's own specification.
Four warnings fire on this exact board: output 3 is a daisy chain (Steady Comp, Halcyon Fuzz and Tidepool Delay share one ground, which is how hum and digital noise cross between pedals on it); Tidepool Delay is digital and high-draw, so it would prefer an output of its own, and the plan had to share one — an isolation preference unmet; and since output 2 sits empty and isolated at the same voltage and polarity, moving Tidepool Delay there would cost nothing — an isolated output free for the taking. None of these is a hard failure: every hard constraint (voltage, polarity, current, forced isolation) is honoured exactly: these are preferences the plan reports rather than enforces.