View Single Post
Old 11th Mar 2019, 1:34 pm   #12
Miguel Lopez
Heptode
 
Miguel Lopez's Avatar
 
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
Default Re: Building a little practical audio amplifier for experimentation

Quote:
Originally Posted by buggies
You are going to invert those electrolytics?
Oh, yes. They are there just posing for the picture

Quote:
Originally Posted by Andy
R11 one would think it would introduce 50hz onto the cathode but you said in an email that the amp is very quiet. Did you fit it on the amp when you built it on the BB Miguel?
Yes I did. In the actual amp, I intend to add a voltage divider to further reduce hum.
And in the worst case it would introduce a 60 Hz noise which is our mains frequency

Quote:
Originally Posted by Julie
I'm guessing the purpose of the BNC connector is so you can wire the amplifier in parallel with an oscilloscope, so you can see and hear exactly what is going on in a circuit?
That will be one of the purposes. BNC is a very useful and common connector and if I finally go after a homebrew radio I could supply this amp from the radio circuit via a BNC connector. Or I can supply the amp from the signal generator (with a dummy load) to test and adjust the amp itself.

In the picture, you can see the circuit mounted on my HTBB (High Tension Bread Board).
Attached Thumbnails
Click image for larger version

Name:	amp on htbb 2k7.jpg
Views:	292
Size:	107.8 KB
ID:	179756  
__________________
When electrons move, things happen.
There's nothing you can do that can't be done.
Miguel Lopez is offline