Electronics on the Floor: Automatic Gain Control with LED and LDR - Part 1 https://stream.echo6.co/videos/watch/e7c5c41c-476c-4591-b82d-8cc28d4ce667 An automatic gain control using one transistor, one LED and one LDR. Video describes circuit and gives a demonstration with a BitX HF transceiver. See Part 2 for more! Some circuit ideas: http://www.zen22142.zen.co.uk/Circuits/Misc/audio_ind.htm http://www.burchills.info/sound_via_light/sound_via_light.html http://www.wireless.org.uk/circuits.htm http://www.electro-tech-online.com/threads/automatic-television-volume-limiter.96341/ 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 01:23:13 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co Electronics on the Floor: Automatic Gain Control with LED and LDR - Part 1 https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/e7c5c41c-476c-4591-b82d-8cc28d4ce667 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.