2W Mini Amplifier

2W Mini Amplifier created for 8, 4 & 2 Ohm loudspeakers.it have Bass-boost switch.

Components

here the electronic component for this 2W Mini Amplifier Circuit

Resistors :
P1.............10K   Log.Potentiometer

R1,R2..........33K   1/4W Resistors
R3.............33R   1/4W Resistor
R4.............15K   1/4W Resistor
R5,R6..........1K   1/4W Resistors
R7.............680R   1/4W Resistor
R8.............120R   1/2W Resistor
R9.............100R   1/2W Trimmer Cermet


Capacitors :
C1,C2..........10µF   63V Electrolytic Capacitors
C3.............100µF   25V Electrolytic Capacitor
C4,C7..........470µF   25V Electrolytic Capacitors
C5.............47pF   63V Ceramic Capacitor
C6.............220nF   63V Polyester Capacitor
C8.............1000µF   25V Electrolytic Capacitor

Diode :
D1.............1N4148   75V 150mA Diode

Transistors :
Q1.............BC560C  45V 100mA PNP Low noise High gain Transistor
Q2.............BC337   45V 800mA NPN Transistor
Q3.............TIP31A  60V 4A    NPN Transistor
Q4.............TIP32A  60V 4A    PNP Transistor

Switch :
SW1.............SPST switch

Speaker
SPKR............ 3-5 Watt speaker impedance 8, 4 or 2 Ohm

Description :

This particular amplifier was created to be self-contained in a small loudspeaker box. It may be feed through Walkman, Mini-Disc, iPod as well as CD gamers, computers and also similar gadgets fitted with collection or head-phone output. Naturally , in most cases you will need to make 2 boxes to acquire stereo.

The actual circuit had been deliberately created using absolutely no ICs and a rather woefully outdated manner to be able to obtain great harmonic daub behavior and also to avoid difficult to find components. The particular amplifier(s) could be conveniently given by a 12V wall plug-in adapter.
Shutting SW1 the bass-boost is actually provided however at the same time, volume level control should be increased to pay for energy loss in higher eq.

In use, R9 should be very carefully adjusted to supply minimal clear signal cross-over distortion in line with minimal calculated quiescent present consumption; a great compromise would be to set the actual quiescent existing at regarding 10-15mA

To calculate this latest, wire any DC recent meter briefly in collection with the enthusiast of Q3.