Technical Topics > The RF Workbench

Symptoms of an oscillating amplifier?

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ff:
I understand your frustration Antennae, AND your determination, having felt both many many times throughout my building career.  The determination you have inside will carry you far if you continue building radio gear, whether pirate or legal.  Doggedly pushing through problems and faults will usually produce a working unit eventually.  Determination is what many would-be builders lack.  It's refreshing to see someone like you who is truly committed to his/her project.  With that in mind I again urge you to put your efforts into a better design once you are satisfied with your Mighty Mike.  I believe you can do it.  And above all... have fun... 73!

audiokaos:

--- Quote from: Antennae on October 15, 2014, 0242 UTC ---makeRF: I'm using the LM386 chip as an amp.

kaliic: The audio sounded fine, just quiet. The LM386 chip would get warm when transmitting.  It would get really hot running a speaker without resistors. It wouldn't get warm when running a speaker with resistors. 

Its not assembled anymore.  It was bugging me why the sound didn't carry very far.  I thought maybe because it was oscillating? I'll reply here if I tweak with it.

thanx

--- End quote ---

FYI you do realize that on a frequency such as 6925, the signal doesn't go that far locally right? It skips. Could have been clear as day 150 miles away.

Antennae:
I should have given more background.
I could hear the carrier wave on the sidebands up to 2 miles away. 
But the audio I could faintly hear only about 100' away. 

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