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How to make an amplifier for a crystal radio that plays it on a loud speaker, like a permanent magnet speaker. This shows the circuit then goes step-by-step through making it on a perfboard. This amplifier circuit is built around the LM386 amplifier chip, and uses various capacitors and resistors. I used an equivalent part for the LM386, the NTE823. This video has correct English captions. Click on the CC button at the bottom of the video to see them. The book I mentioned that I first found this project in (very good collection of projects): "Radio Receiver Projects You Can Build" by Homer L. Davidson The LM386 chip document I mentioned containing the circuit and more chip details on Texa Instruments' website: http://www.ti.com/lit/ds/symlink/lm386.pdf See also: How to Make/Build a Crystal Radio http://youtu.be/VqdcU9ULAlA Portable Crystal Radio using Loop Antenna and Pizza Box http://youtu.be/iunAvz9PbN0 How Radiation Works - Americium 241, Alpha Particles and Gamma Rays http://youtu.be/aJkx6hAD-4E How a Crystal Radio Works http://youtu.be/0-PParSmwtE How to Make Amplifier for Crystal Radio Earpiece http://youtu.be/cQ-LxMDrD_o For my webpage about making this crystal radio amplifier, go to: http://rimstar.org/science_electronics_projects/make_crystal_radio_amplifier_for_speaker.htm Follow behind-the-scenes on: Twitter https://twitter.com/#!/RimStarz Google+ https://plus.google.com/116395125136223897621 http://rimstar.org Music used from 0:15 to 2:31 and from 9:08 to 9:35: 5 Cents Back - music by audionautix.com Music used from 2:37 to 4:50 and 7:44 to 8:25: Sneaky Snitch Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/ ISRC: USUAN1100772 Music used from 4:50 to 7:44: Decisions Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/ ISRC: USUAN1100756
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