1. WELCOME
TO
OUR
PRESENTATION

2. Topic
SIMPLE OP AMP AUDIO AMPLIFIER

3. Presented By
Name
Md. Zahurul Islam
Abdullah Al- Mamun
Md. Mazharul Islam
Md. Readul Hasan
Sanjid Alam
Md. Ahashanulla
ID
11105064
11105077
11105074
11105073
11105056
11105057

4. Sequence
Equipments
Goals
Connections
How does it works

5. Equipments
LM 386 op amp IC chip.
1000 microfarad capacitors (2 Pieces)
100 microfarad capacitor(1 Piece)
8 ohm speaker
9 volt battery
Jack socket & Jack pin
Project board or breadboard
Some connecting wire.

6. Goals
The voice amplifier is used to provide loud, clear
output required for high quality voice.
It has a line input jack that can be connected to the
output of speech generating device for adequate
sound levels in noisy environtments.

7. Connections
 Plug in your op amp and add a
wire from pin 6 to power and a
wire from pin 4 to ground.
 Plug another wire from pin 2 to
ground and plug your jack socket
into pin 3.
 Plug your 1000 microfarad
capacitor's positive side into pin 7
and the negative side into ground.
 Plug one your another 1000
microfarad capacitor's positive
side into pin 1 and the negative
side into pin 8.

8. The other 100 microfarad capacitor's positive side into
pin 5 and the negative side into a blank space on your
board.
Plug your speaker's positive side to the last capacitor's
negative side and the negative side of your speaker to
ground.
Plug in your battery's terminals to their respective rails.

9. How it works
An amplifier convert low input into high gain.
The input obviously goes to 2 & 3.
Pin 2 is input(-) & pin 3 is input(+).
As pin 3 is input(+) so it is a non-inverting amplifier &
the output will be always greater.
When we give signal to the pin 3 the gain will be
achieved in pin 1 & 8.
After amplifying the output will be noticed in pin 5.

10.  If you put a capacitor between pin 1 and 8, you can
control the amount of the gain.

11. ANY QUESTION?

12. THANK YOU EVERYONE…..