Opiniones sobre estos circuitos de amplificadores

#1
Hola! Quería saber que les parecían estos circuitos;

El primero es un amplificador de 25W en 8Ω:
http://wiringcircuitdiagram.wiringdiagramcircuit.com/tag/hifi-amplifier/

Componentes:

PHP:
R1,R4 = 47K       1/4W Resistors
R2 = 4K7	1/4W Resistors
R3 = 1K5	1/4W Resistors
R5 = 390R	1/4W Resistors
R6 = 470R	1/4W Resistors
R7 = 33K	1/4W Resistors
R8 = 150K	1/4W Resistors
R9 = 15K	1/4W Resistors
R10 = 27R	1/4W Resistors
R11 = 500R	1/2W Trimmer Cermet
R12,R13,R16 = 10R	1/4W Resistors
R14,R15 = 220R	1/4W Resistors
R17 = 8R2	2W Resistor
R18 = R22	4W Resistor (wirewound)
	
C1 = 470nF	63V Polyester Capacitor
C2 = 330pF	63V Polystyrene Capacitor
C3,C5 = 470µF	63V Electrolytic Capacitors
 C4,C6,C8,C11 = 100nF	63V Polyester Capacitors
C7 = 100µF	25V Electrolytic Capacitor
C9 = 10pF	63V Polystyrene Capacitor
C10 = 1µF	63V Polyester Capacitor
	
Q1-Q5 = BC560C	45V100mA Low noise High gain PNP Transistors
Q6 = BD140	80V 1.5A PNP Transistor
Q7 = BD139 	80V 1.5A NPN Transistor
Q8 = IRF532	100V 12A N-Channel Hexfet Transistor
Q9 = IRF9532	100V 10A P-Channel Hexfet Transistor

El segundo es un amplificador de 40W en 8Ω:
http://electronicsproject.org/7040-watts-hi-fi-amplifier/

Componentes:

PHP:
R1, R7 = 100 KOhms

R2, R3, R9 = 1.2 KOhms

R4, R5, R6 = 2.7 KOhms/2W

R8 = 4.7 KOhms

R10, R13, R16, R18, R19 = 100 Ohms

R11 = 3.3 KOhms

R12, R17 = 680 Ohms

R14, R15, R22, R23, R24, R25 = 1 Ohm /2W

R20 = 10 Ohms /2W

R21 = 1o Ohms /1W

VR1 = 100 Ohms

[B]Capacitors[/B]

C1 = 1 µF/polyester

C2, C3 = 25 µF/25V electrolytic

C4, C8, C9 = o.1 µF polyester

C5 = 10 µF/60V electrolytic

C6 = 4.7 µF/10V electrolytic

C7 = 56 pF ceramic disc

[B]Semiconductors[/B]

T1, T2, T3 = BC546B

T4 = BC558B

T5, T11 = 2N4033

T6, T10 = 2N3019

T7 = BC548B

T8, T9 = BC147B

T12 = BD140

T13 = BD139

T14 = 2N3055

T15 = MJ2955

ZD1 = 3.3V 400mW zener diode

ZD2 = 3.9V, 400mW zener diode

[B]Miscellaneous[/B]

L1 = Coil having 20 turns of 20 SWG over thin pencil

F1 = 3.5 Ampere fuse

[B]SPECIFICATIONS[/B]

Output power (1 KHz, o.7% THD): 73W into 4-ohms and 44W into 8-ohms

Offset Voltage: Less than ±40mV

Input impedance: 100 K

Harmonic distortion : 0.015%

Intermodulation distortion (70W): 0.02%

Frequency range: 10 Hz – 30 KHz, ±2dB

Signal-to-noise ratio (out = 100mW): Over 72dB
¿Alguno es mejor que el otro? ¿Alguien los armó?

Edit: Los circuitos también están publicados en el foro, para que no se pierdan.

Muchas gracias!

Saludos!
 

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