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How to Build a Morse code telegraph

Electrical circuit experiment on cardboard.

Keeping secrets out of the wrong hands warrants desperate measures—or maybe just sensical. If you have a secret, the best way to protect it is with a code—and the best way to transfer that secret message is via an electronic telegraph system. This video will show you how to make your own homemade electronic telegraph machine, so that you can send those encrypted Morse code messages to your friends without fear of prosecution.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check our list of supported iPhone and iPad models, then follow our step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.

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