Posted by Circuits Arena on Sunday, 21 December 2014
Mini Amplifier Circuit Diagram is the artlcle explaining Mini Amplifier: This mini amplifier making simple and compact in size and also used for laptop speaker amplifier. This circuit can be op...
Mini Amplifier:
This mini amplifier making simple and compact in size and also used for laptop speaker amplifier. This circuit can be operate small voltage 3 volts to 9 volts and also carry with us.
Description:
The input is taken from pin no.4 through
variable resistor VR1 and capacitor C4.
The variable resistor VR1 is used to
select the Range of signal. Capacitor C2 and C6 is used to filter and quality where capacitor C3 and C5 is used to bias the
audio frequency.
The output of amplifier IC is obtained at pin 1 where
resistor R4 and capacitor C8 is used as feedback component. The output
is given to loudspeaker through capacitor C7 in order to produce sound.
Components:
- Resistors - R1 = 10 KΩ
R2 = 47Ω
R3 = 220Ω
R4 = 1Ω
VR1 = 50 KΩ
Capacitors - C1 = 470 pF
C2 = 220 µF/10V
C3 = 100 µF/10V
C4 = 0.1 µF
C5 = 10 µF/10V
C6, C7 = 470 µF/10V
C8 = 0.1 µF
Semiconductors- IC1 = LM1895N
Miscellaneous - LS1 = 4Ω/1W speaker
