Can't get a crystal earphone? Try a piezo transducer. https://stream.echo6.co/videos/watch/e09e2cd8-bcc9-4ce7-9d6c-0b4680b92849 If you can't get a crystal earphone, as specified for crystal sets and some QRP transceiver designs, why not try a piezo transducer? This video features a comparison. Note: A piezo buzzer is not to be confused with a piezo transducer. A buzzer is a little bigger and makes a noise when fed with DC. It is not suitable for this project. 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) Mon, 04 May 2026 23:11:04 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co Can't get a crystal earphone? Try a piezo transducer. https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/e09e2cd8-bcc9-4ce7-9d6c-0b4680b92849 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.