3 – 5 Watt Amplifier Class-A

3 - 5 Watt Simple Amplifer Circuits that acts like a one-valve operated amplifier without cross-over distortion.

Components

here the electronic component for this 3 - 5 watt amplifier circuit.

Resistor Components :
R1..........100K  1/4W Resistor
R2..........12K  1/4W Resistor (See Notes)
R3..........47K  1/4W Resistor
R4..........8K2 1/4W Resistor
R5..........1K5 1/4W Resistor (Optional, see Notes)
R6..........2K7 1/4W Resistor
R7,R9.......100R  1/4W Resistors
R8..........560R  1/2W Resistor (See Notes)
R10.........1R  1/2W Resistor

P1..........47K  Log. Potentiometer (Dual-gang for stereo)

Capacitor Components :
C1,C2.......10µF  63V Electrolytic Capacitors
C3..........47µF  25V Electrolytic Capacitor
C4..........100µF  35V Electrolytic Capacitor
C5..........150nF  63V Polyester Capacitor (Optional, see Notes)
C6,C7.......220µF  25V Electrolytic Capacitors
C8..........1000µF  25V Electrolytic Capacitor

Transistor Components :
Q1..........BC560C  45V 100mA Low noise High gain PNP Transistor
Q2,Q3.......BD439   60V 4A NPN Transistors

SPKR........ impedance: 8 Ohm Min power handling  5W

3 – 5 Watt Amplifier Class-A Circuit

Description

Within the old device days, the majority of commercial sound amplifiers best for compact incorporated mono or even stereo document players utilized a one-valve amplifier topology. The signal was generally implemented using a multiple kind valve, electronic. g. the triode pentode ECL86.

Typical features for all those amplifiers had been: Class The operation, outcome power within the 3 -- 5W variety, input awareness of about 600mV for complete output energy, THD of approximately 3% snabel-a 3W as well as 1KHz.

Greatest types revealed THD numbers of 1. 8% @ 3W and zero. 8% snabel-a 2W.
This particular solid-state push-pull single-ended Course A routine is capable associated with providing a audio comparable to all those valve audio receivers, delivering much more output strength (6. 9W measured throughout a eight Ohm loudspeaker cabinet load), less THD, higher enter sensitivity and also better linearity.

Voltage along with current necessary for this outlet are 24V and 700mA respectively, when compared with 250V HT rail in addition to 1A snabel-a 6. 3V filament heating system for valve-operated amplifiers.

The only real penalty for your transistor controlled circuit may be the necessity of utilizing a rather big heatsink with regard to Q2 plus Q3 (compared to the optimum power delivered).
In any case, the quantity of heat created by this rounds can be similar to that of any one-valve amp.

An optionally available bass-boost service can be additional, by means of R5 and C5.
This enterprise was constructed and in contrast to a one-valve box gramophone circuit from the late 1950s through Aren vehicle Waarde , some sort of Dutch biochemist working in area of healthcare imaging (PET) with a powerful interest in music and control device amplifiers.

A comprehensive description regarding both brake lines and the outcomes of subjective examination comparisons using this00 distinguished Writer appeared upon AudioXpress    magazine:  Feb, March and even April july 2004 issues.