# Transisitor amp

#### esrman66

Joined Dec 29, 2014
18
I made the amp shown in the transistor biasing video and the voltages Are just about right but the output waveform looks like its amplifying but looks like it has noise or something on it.

I did use a MPSA06 instead of the 2n2222 he showed.

Does anyone know how to contact the author of that video?

Howie

#### blocco a spirale

Joined Jun 18, 2008
1,546
If you post the schematic and an image of the output waveform I'm sure someone here can help.

#### esrman66

Joined Dec 29, 2014
18
If you post the schematic and an image of the output waveform I'm sure someone here can help.

#### esrman66

Joined Dec 29, 2014
18
How do I do I post an image off my Computer?

Howie

#### ErnieM

Joined Apr 24, 2011
8,053
If you have nothing else the "PRT SCN" button captures your entire monitor screen. You can then paste that into MS Paint, crop out the parts of the screen you don't want, save that file and upload it here.

#### esrman66

Joined Dec 29, 2014
18
If you have nothing else the "PRT SCN" button captures your entire monitor screen. You can then paste that into MS Paint, crop out the parts of the screen you don't want, save that file and upload it here.
Thats what I meant.How to upload off computer to this forum?

#### GopherT

Joined Nov 23, 2012
8,012
When you make a new post on a thread, click the button in the lower right (Upload a File).

#### GopherT

Joined Nov 23, 2012
8,012
If you have nothing else the "PRT SCN" button captures your entire monitor screen. You can then paste that into MS Paint, crop out the parts of the screen you don't want, save that file and upload it here.
If you hold the ALT key before pressing the Prt Scn KEY, Windows will only 'print' (copy) the active window.

#### esrman66

Joined Dec 29, 2014
18
When you make a new post on a thread, click the button in the lower right (Upload a File).
have 3 different inages.

I cant load the image here.Seems like it has to be a png file.

#### GopherT

Joined Nov 23, 2012
8,012
have 3 different inages.

I cant load the image here.Seems like it has to be a png file.
Any of the following will work...

#### esrman66

Joined Dec 29, 2014
18
have 3 different inages.

I cant load the image here.Seems like it has to be a png file.
I converted one to a png and it still didnt upload

#### esrman66

Joined Dec 29, 2014
18
Now I get a popup over your reply and cant close it.

#### esrman66

Joined Dec 29, 2014
18
I got it!

#### Attachments

• 1.1 MB Views: 20

#### esrman66

Joined Dec 29, 2014
18
I forgot to tell you that I changed the circuit from one breadboard to a fresh one as the original was way overcrowded with projects.

Now it doesnt seem to have any noise but the waveform is not correct.

#### esrman66

Joined Dec 29, 2014
18

#### esrman66

Joined Dec 29, 2014
18
That one is at just about the design freq.

#### esrman66

Joined Dec 29, 2014
18
f you notice the images i sent this amp works well into the mghZ range with the stated parts on the schematic.

#### Attachments

• 334 KB Views: 37

#### esrman66

Joined Dec 29, 2014
18
Notice the one at 39MghZ does have some thing that looks like noise or distortion.

The top traces are the signal at the input of the amp.

#### blocco a spirale

Joined Jun 18, 2008
1,546
With a 1kHz input and starting at 0V, if you gradually increase the amplitude what happens to the output?

#### crutschow

Joined Mar 14, 2008
25,263
It looks like you are overdriving the amp and it's clipping.