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Why it's not possible to synchronize turn signals (but also absolutely is)

55 videos recommended on HN
YouTube
1 HN user recommended this explainer1 month2021–2024 score 1.5
Years with an HN recommendation, 2007–2026

Referenced as a typical example of the channel's hacker-eye view of everyday technology, and for its flasher explanation.

Technology Connections explains why car turn signals appear to drift out of sync at stoplights and how thermal and other flasher designs work. It also covers how synchronization could be achieved.

“The TC channel is definitely a hacker's eye view in to all the technologies that we take for granted every day.” (HN, 2022)

1 strong recommendations · 2 citations · Explainers

3 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@bcjordan Sep 2022 Strongly recommends
on HN thread Interest in heat pumps has increased dramatically in recent years
Came here to post this :D The TC channel is definitely a hacker's eye view in to all the technologies that we take for granted every day. Tons of fascinating tech history covered, too. Other fun ones: - a defense of the simple drip coffee maker [link] - why do the turn signals not sync up when you're at a stop light? [this video] - how humidifiers work and ehy the simple swamp cooler style are pretty ideal [link] - why dishwasher detergent packs are stupid (use powder/liquid) and why you should use the pre-wash slot and not bother pre rinsing your plates [link] - why do light switches click? [link]
Why turn signals don't sync at stoplights

Citations, criticism and jokes

@Dwedit Jun 2024 Cites it
on HN thread Apple II graphics: More than you wanted to know
There's a video by Technology Connections all about turn signals: [this video] Demonstrates thermal-based flashers as well as capacitor-based flashers. They are clicking because metal is moving and hitting metal.
Demonstrates thermal and capacitor-based flashers

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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