Capacitor Whine Charge

How it's made

Source

a flash charging inverter excites its transformer windings. A thin sine-dominant whine rises from 1.6–2.4 kHz to 4.2–6.2 kHz as the switching cycle changes, levelling off near full charge.

Body

a weak second harmonic and half-frequency winding vibration give the tone physical substance; low-Q filtered noise at 650 Hz models the housing, with a faint moving switching-noise band.

Modulation

85–145 Hz supply ripple gives shallow amplitude and frequency modulation; slow seeded drift adds less than 0.15 percent pitch movement. Higher partials recede as charging current falls.

Envelope

a 14 ms soft start, a gentle swell, then falling current and a 35 ms shutdown fade. After 35 ms a piezo ready indicator sounds at 2.4–3.4 kHz, with 5 ms attack and 25 ms release, without discharge.

Layers

the dry centred ready beep has a weak 2.03-ratio ceramic overtone; single and double signals last 150 ms and two 75 ms pulses respectively. No room reverberation or flash-tube pop is included.

Variation

seeded tuning varies by 0.7 percent; charge time, pitch range, winding texture and ready pitch distinguish pocket, older transformer, studio double-ready and slow-battery presets.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.