https://stream.echo6.co/videos/watch/0ab108e6-84ea-47bb-943e-3270c84e0c62 Describing a simple to build hand-cranked CW transmitter built inside a wind-up torch. The torch's circuit board, battery and LEDs were removed to make room for the project. This video has more on torch generators: https://www.youtube.com/watch?v=2E0-6vC_JDA Using 3 transistors based on GM30XX's famous OXO circuit it can be heard hundreds of kilometres away. For those who were wondering, the coil in the collector of the BD139 is a few turns of wire on a ferrite to act as an RF choke. The videos referred to on the Gibson Girl, which partially inspired this project, are at https://www.youtube.com/watch?v=hY4pu9SoVfw and https://www.youtube.com/watch?v=-bl2KvCWRhw This video is VK3CRG's reception of the transmitter from about 60km away. https://www.youtube.com/watch?v=qQnnp86PY0g This video is VK5MTM's reception of the transmitter from nearly 700km away. https://www.youtube.com/watch?v=9Oicqr28xLk PS: If you liked this video please consider supporting Amateur Radio VK3YE by: Subscribing on YouTube, Checking my books page at https://books.vk3ye.com, Shopping on Amazon via: https://amzn.to/3iiDQXv, or, Shopping on eBay via: https://ebay.us/i9DuWP (then if you buy something I'll get a small commission at no cost to you) Wed, 06 May 2026 02:03:21 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/0ab108e6-84ea-47bb-943e-3270c84e0c62 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.