George L.
New Member
Hello,
I am trying to make a Megaphone or a device in which you can speak into a electret mike, the circuit will amplify the signal and use a large speaker to make what you are saying much louder. I breadboarded the circuit from this site:
https://cnx.org/content/m12514/latest/figure14.jpg
The supply I am using is a 12V 1.2A transformer. I just connected a 3 inch 8 ohm speaker to the output. As soon as I turn in on, I get a loud buzzing sound, If I speak into the electret, I can barely hear my voice in the background of the loud buzzing comming from the speaker.
Does anyone know what the problem is or how to fix it?
thanks,
George L.
I am trying to make a Megaphone or a device in which you can speak into a electret mike, the circuit will amplify the signal and use a large speaker to make what you are saying much louder. I breadboarded the circuit from this site:
https://cnx.org/content/m12514/latest/figure14.jpg
The supply I am using is a 12V 1.2A transformer. I just connected a 3 inch 8 ohm speaker to the output. As soon as I turn in on, I get a loud buzzing sound, If I speak into the electret, I can barely hear my voice in the background of the loud buzzing comming from the speaker.
Does anyone know what the problem is or how to fix it?
thanks,
George L.