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arduino - Three different schemes to amplify audio input, which one is correct? - Electrical Engineering Stack Exchange
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![been a while since I did anything with an Arduino so decided to rebuild my dead hifi amplifier but using PT2257 digital Potentiometers with encoders and audio relays because the contact issues been a while since I did anything with an Arduino so decided to rebuild my dead hifi amplifier but using PT2257 digital Potentiometers with encoders and audio relays because the contact issues](https://i.redd.it/e1xwiz133g951.jpg)
been a while since I did anything with an Arduino so decided to rebuild my dead hifi amplifier but using PT2257 digital Potentiometers with encoders and audio relays because the contact issues
![NE5532 OP-AMP Stereo Amplifier Board Audio HIFI Speaker Amplifier Module Control Board Circuit Sound Development for Arduino - AliExpress NE5532 OP-AMP Stereo Amplifier Board Audio HIFI Speaker Amplifier Module Control Board Circuit Sound Development for Arduino - AliExpress](https://ae01.alicdn.com/kf/Hb4e5ba9cabda48bba37b57f0ea8bbe31d.jpg_640x640Q90.jpg_.webp)
NE5532 OP-AMP Stereo Amplifier Board Audio HIFI Speaker Amplifier Module Control Board Circuit Sound Development for Arduino - AliExpress
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Here's a diagram of the LM3886 audio amplifier's pin layout for your reference From A Complete Guide to Design and Build a Hi-Fi LM3886… | Instagram
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