Capacitors in common emitter audio amplifier

  • #1

Homework Statement



Hello. When I looked at my lab manual, I saw the capacitor CB is connected in reversed direction. The AC source is connected to resistor RS, then connected to the negative polarity of CB. But I have no idea why it connects in reverse. Can please anyone tell me the reason? I have tried to connect capacitor in reverse ( not in this audio amplifier) and the capacitor exploded.

2eekh2x.jpg
 

Answers and Replies

  • #2
NascentOxygen
Staff Emeritus
Science Advisor
9,244
1,072
The average of the voltage from your signal generator is 0V. The average of the voltage at the junction of R1 and R2 is some positive voltage. Electrolytic capacitors must be connected so average polarity is observed, otherwise they may explode. Instead of maintaining an insulating dielectric, the reversed polarity can destroy part of the dielectric causing a short circuit and high fault current inside the capacitor.
 

Related Threads on Capacitors in common emitter audio amplifier

  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
13
Views
796
  • Last Post
Replies
1
Views
1K
  • Last Post
2
Replies
25
Views
6K
Replies
17
Views
873
Replies
2
Views
3K
Replies
5
Views
860
  • Last Post
Replies
4
Views
2K
Top