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

Technology Connections · 3.3M views · 2021-08-20 · 37:16

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Overview

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.

On Hacker News

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

Recommended by 1 HN people across 1 months · HN mentions 2021–2024

Topics

Cars, EVs & motorcyclesElectronics & circuit designMechanical & precision engineering
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turn signalsflasher relaysautomotiveelectronicstechnology connections

What people said

bcjordan · 2022-09 · Strong recommendation

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? [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]

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Dwedit · 2024-06 · Reference

There's a video by Technology Connections all about turn signals: [VIDEO] Demonstrates thermal-based flashers as well as capacitor-based flashers. They are clicking because metal is moving and hitting metal.

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beeboop · 2021-12 · Reference

please please don't: [VIDEO] I refuse to drive at night anymore. Headlights are way too bright and a big reason is people putting poorly made and poorly aimed aftermarket headlights on.

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Sources

Video by Technology Connections, played through YouTube.

Data and selection notes

HN summaries and labels may contain AI errors. HN dates refer to discussions, not video publication.

HN Library: HackerTube export (2026-10-31) and open-index/hacker-news. Upstream summaries and classifications may contain AI errors.

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