Problem 1 - Distorted Output
You received this amplifier and the client complained of distortion. Luckily the client had a favorite song and has recorded it once before and then again as they did not know how to describe the problem other than it doesn't sound good anymore.
Before the trouble audio
After the trouble audio
So you open the local folder containing three things, a bode plot, a schematic with nodes annotated on the schematic, and a note that this is a small amplifier with a variable bandwidth. It appears the previous technician didn't bother to take the copious notes to keep the folder updated with normal voltags and other useful tidbits.
Amplifier Bode Plot
click on diagram for a larger picture in a new window.
Oscilloscope Signals on the listed nodes
|Node 5||Node 6||Node 7||Node 8|
|Node 9||Node 10||Node 11||Node 12|
|Node 13||Node 14||Node 15|
|Node Pos 9V||Node Neg 9V||Node Vi||Node Vo|
Good luck on your troubleshooting. If you have any questions or comments, use the contact us form.