LM386 Audio Amplifier

RE: LM386 Audio Amplifier

nick123 — Sat, 13 Feb 2016 20:45:38 GMT

Did you hand etch that board?

RE: LM386 Audio Amplifier

DAB — Sat, 13 Feb 2016 20:43:22 GMT

What is the bandwidth for the amplifier?

DAB

RE: LM386 Audio Amplifier

jw0752 — Sat, 13 Feb 2016 20:18:43 GMT

Hi Pedro,

This was a very nice project. It is really good that you are open to learning. I have learned a lot of new things by listening to [mention:a5312e9762dd4699ba5d3876da34ffe5:e9ed411860ed4f2ba0265705b8793d05] as he always has good solid advice.

John

RE: LM386 Audio Amplifier

michaelkellett — Sat, 13 Feb 2016 09:36:51 GMT

if you do any more of this work the consider how to arrange the tracks so that the ground plane flows better. Look how far it is from VALIM-2 to X1-2 and how thin the ground connection gets at the top of the board. The ground connections to the pot have to share a long and tortuous path with the load current. The little bit of ground near C7 isn't doing anything useful.

For a low gain audio amp you may get away with this (although it might well have issues with CE level EMC susceptibility tests). For anything working at high frequencies it pays to make your ground planes better.

Hope this helps your next design.

RE: LM386 Audio Amplifier

nick123 — Sat, 13 Feb 2016 05:19:29 GMT

Welcome, cool amp, see if you can get a guitar amplified through there [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-d8785f0a-8b69-443e-9fb9-8c633b1f9c07/contentimage_5F00_1.png:16:16]