How to make mini audio amplifier - LM386
13One of the #electronic project i am working on is #HowTo make audio amplifier using this cheap IC called LM386. It only a few cents each and i thought it could make a great sound since most people having trouble removing the distorted noise from the ground loop.
One of the basic principle that I've learned throughout this project is how to connect the ground wire properly. Firstly do not connect from too many directions - but one serial connection. Which means connect the negative source of the power supply to one connection then from that point connect to another so it flows in series. If the negative is connected to every direction it will most like cause the distorted noise.
Second principle is to have connection as close as possible to one another. Also helps to reduce the noise and that's why using a properly printed circuit board is much better because the schematic can be designed to stay close to one another. If you are using breadboard as shown on the video - it's more effective to use cable connectors which snug fit into the connection hole of the prototype board
The ultimate principle is using step down mini-transformer at the input - because of the unregulated frequency from the input source the LM386 is very sensitive. That instability and produce distorted noise in the output. So when the frequency is step down it produce more current and supply stead flow of audio frequency into the LM386 amplifier. Then at the output use a coupled inductor to regulated the audio output. This certainly the best noise reduction method and I believe the best audio amplifier out there is using this way to reduce noise because it's the most effective and easy to do.
#DIY #homeMade