Circuit Board — our demo

One example among many. Don't reuse its story, arc, shots, props or timings.

Demo: Seven Milliseconds · 七毫秒 (60 s, Chinese voice-over, bilingual subtitles) · circuit-board.mp4 · source in demo/

Story & structure

Power made deep in the mountains of Sichuan reaches Jiangsu, 2,000 km away, in seven milliseconds. A Chinese voice (edge-tts Xiaoxiao, +20%) tells it as a friend would: household power swings back and forth (alternating current); sent that far it would be lost on the way; so a converter station turns it into one-way direct current; it races 2,080 km in 7 ms; at the other end it is turned back, stepped down level by level and sent to a wall socket; inside a phone charger a tiny bridge rectifier does the same job as the giant in the converter station, on the same circuit principle, with 400 million times less power. Every line has a subtitle (Chinese over English, bottom safe area); the board itself only prints the voice's key words and numbers (交流電 / AC, 損耗 / LOSS, 換流站, 直流電, 2,080 公里, 7 毫秒, 降壓, 充電器, 整流橋, 同一個電路原理, 功率差 4 億倍). Facts: demo/FACTS.md.

Native moves spent: flow becomes current (dam), pulse-path explainer (the whole film), AC vs DC told by the shape of the light (bus close-up, loss board, Butuo), the map is a board (corridor), matched step-down (four cuts), plunge through a hole (socket → charger), detail callout (verdict), nested boards (closing pull-out).

Shots

# Time Voice (first words) Shot Camera Note
1 0–4.7 四川深山裡發出來的電… Baihetan: water through 16 penstocks, generators light on 16ths; title 七毫秒 / SEVEN MILLISECONDS top right macro on G1 at frame 0, pull-out ×10 by 2.0 s, hold flow becomes current
2 4.7–10.1 平時我們家裡用的電… the right-bank bus close up: big AC dashes swinging slowly back and forth; 交流電 / AC with a silk sine push in, hold the swing slowed to ~0.55 Hz
3 10.1–14.4 如果直接送去太遠的地方… a long straight board: AC dashes move on, dimmer, thinner and fewer; 損耗 / LOSS slow pan right stand-alone board
4 14.4–19.1 所以，電得先進一趟換流站… Butuo: AC in, the bridge conducts at 16.3, two DC streams out; 交流電, 換流站, 直流電 slow push, whip east at 18.75
5 19.1–23.5 然後再順著這根兩千多公里長的電線… the corridor: rides the DC head, rises until both ends are in frame; 四川 / 江蘇 large, 2,080 公里 ride → rise → crash zoom at 23.0 main line ≥ 6.5 px wide at map scale
6 23.5–29.6 全程只要七毫秒… / 到了終點站… Yucheng: 7 毫秒 / 7 ms tag; at 27.4 AC leaves (交流電 / AC) locked reading hold
7 29.6–32.4 …再把電壓一級一級降下來… four step-down transformers T1–T4 at one screen size, 0.7 s each; 降壓 / STEP DOWN stays in the same place matched cuts
8 32.4–34.6 …最終送進你家牆上的插座裡。 the block flashes by; the socket wall (switch, two sockets, L/N/PE wiring); plunge into the live hole pan, hold, plunge
9 34.6–42.1 而當你插上手機充電器時… out of the charger's pin: the whole charger (plug, fuse, bridge, capacitor, transformer, USB-C), 充電器 / CHARGER; push in to the bridge: 整流橋, 交流 → 直流 reverse out, hold, push
10 42.1–52.9 說出來你可能不信… / 只不過… detail callout: Butuo's bridge beside DB1 at the same size; 換流站; "=" and 同一個電路原理 at 47.6; 功率差 4 億倍 at 49.4 locked verdict held 5.4 s before "="
11 52.9–54.5 你手機裡的每一格電… one pull-out from the charger to the whole board, the main line glowing log zoom
12 54.5–60 — the whole board on a desk, noon window light; title block: 七毫秒 / SEVEN MILLISECONDS, LemoLab × Claude Opus 5.5 slow push, 2° turn end card

Voice-over

Chinese voice, edge-tts zh-CN-XiaoxiaoNeural at +20% (demo/voice/lines.json); each line starts at the time below, and its subtitle (Chinese over English) comes and goes with it. The English version (sh demo/build.sh en) speaks the English subtitle lines with en-US-AvaNeural at +10% (a few lines faster, up to +25%), starting at the same moments (demo/voice_en/lines.json; where a spoken line is shorter than its subtitle, the say field holds what is spoken).

# Start Chinese English
1 0.40 s 四川深山裡發出來的電，僅僅七毫秒後，就到了兩千公里外的江蘇。 Power made deep in the mountains of Sichuan reaches Jiangsu, 2,000 km away, in just 7 milliseconds.
2 5.58 s 平時我們家裡用的電，電流是來回擺動著走的，叫做交流電。 The electricity in our homes swings back and forth as it flows. It's called alternating current, AC.
3 10.22 s 如果直接送去太遠的地方，在路上就會白白損耗掉很多。 Sent that far as it is, a lot of it would simply be lost on the way.
4 14.55 s 所以，電得先進一趟換流站，變成只朝一個方向跑的直流電。 So first it goes through a converter station and becomes direct current, DC, flowing one way only.
5 19.24 s 然後再順著這根兩千多公里長的電線，一路狂奔到江蘇。 Then it races along this line, more than 2,000 km long, all the way to Jiangsu.
6 23.53 s 全程只要七毫秒，連眨一下眼睛的時間都不到。 The whole trip takes 7 milliseconds, less than the blink of an eye.
7 27.15 s 到了終點站，它會被重新變回交流電，再把電壓一級一級降下來，最終送進你家牆上的插座裡。 At the end it's turned back into AC, stepped down level by level, and sent to the socket in your wall.
8 34.20 s 而當你插上手機充電器時，充電頭裡其實也藏著一個叫整流橋的小零件，正在把交流電重新變回直流電。 Plug in your phone charger, and inside it a tiny part called a bridge rectifier turns the AC back into DC.
9 42.24 s 說出來你可能不信，它和換流站裡那個幾層樓高的大傢伙，用的是同一個電路原理。 Believe it or not, it works on the same circuit principle as the giant, storeys tall, in the converter station.
10 48.39 s 只不過，換流站那邊的功率，是這個小充電頭的整整四億倍。 Only the station's power is a full 400 million times that of this little charger.
11 53.05 s 你手機裡的每一格電，都是跨越千山萬水，這麼跑過來的。 Every bar of charge on your phone came this far, across mountains and rivers.

Score structure

Voice first: the bed (music and room tone) is ducked 9.5 dB under each line and sits about 17 dB under the voice; effects drop 7 dB. 100 BPM, G (the mains hum on G1). AC is a gated tone (slowed to 1.1 Hz while the voice explains it, dying away over the loss board); at Butuo (16.3) the gate smooths into a steady tone, the kick, ticks and bass enter, an arpeggio climbs through the ride with a glockenspiel at each 500 km pad; impact at 23.0, a bell for 7 ms, AC again at 27.4, four relays one step lower each, cicadas and an air-conditioner drone at the socket, suction and a pop through the hole; in the charger a faint whine, a high gated tone that smooths at the bridge (39.4); in the verdict a low tone (the station) under the high one, a clean G major chord on "=". Pull-out whoosh and pad, the last hit at 54.8, the hum to the end. −16.0 LUFS integrated, −4.5 dBTP.

Palette & props

Mask greens #05190F / #1C6A44 / #4AA977, gold #D9B25B, bare-copper dam bar #C9784A, silk #F2EEE1, current amber (255,190,84), water silver (170,214,226). Props: the dam with 16 penstocks and generators (a step-up coil on every lead), connector J2; the bridge footprint (a diamond package with four diode symbols and a pad at each vertex: AC in at the left, return via at the right, + top, − bottom), converter transformers, AC filter banks, smoothing reactors, valve-hall courtyards; the corridor geography (octilinear Yangtze with five tributaries, four lakes, the east coast, the board's south-east corner cut at 45° over open sea so its edge stays clear of Taiwan, real cities as test points, three more unlit ±800 kV lines); the loss board (one long bus, a ruler, test points); a city module (streets as channels, buildings as pad grids); a street module (a block of 18 floors as a lit pad array, pole transformer, a socket wall with a switch and a second socket, L/N/PE wiring, a sun and a clock at noon); the charger (plug blades, L/N pads, F1, RV1, CX1, DB1, C1, T1 over an isolation slot, CY1, U1, U2, C2, USB-C).

End card

The board's own title block, top right of the corridor board, plotted at 54.8: 七毫秒 (≈ 75 px) / SEVEN MILLISECONDS; at 56.0 the row LemoLab × Claude Opus 5.5 (≈ 25 px caps); REV A / SHEET 1 OF 1 in its corner. No voice after 57.0; held to 60.0 under the window light. The "LemoLab × Claude Opus 5.5" sign-off belongs to this library's demo only; a user's film carries no LemoLab credit and no copy of this card.

Build notes