https://stream.echo6.co/videos/watch/64e6e3ef-f204-4478-9d2b-7d2f5a37f232 I think the best lesson that can be learned from this cheap USB disco light is the importance of supply rail decoupling in the vicinity of audio circuitry. There's an audio amplitude detector circuit that triggers continually when used on anything other than a perfectly noise free USB power supply. That said, it's a good demonstration of a simple electret microphone based audio detector with a minimalist single transistor amplifier. The lens projects fairly good beams of light from the hard-driven (50mA) LEDs, so it might find use in other projects. The light came from a UK pound-shop called One Below. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty. #ElectronicsCreators Mon, 13 Apr 2026 22:55:35 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/64e6e3ef-f204-4478-9d2b-7d2f5a37f232 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.