Power Amplifilier 65 Watt with HEXFET

Part List

R1-15-16-21-22-17-18=1Kohm R33=68ohm 5W Q1-2=BC550C [matched]
R2=47Kohm R35-36=6.8ohm 1W Q3-4=BC560C [matched]
R3-4=10Mohm TR1=1Kohm trimmer Q5=BC560C
R5-6-13-14=1.2Kohm TR2=1Mohm trimmer Q6=BC550C
R7-12=47ohm C1=2.2uF 63-100V MKT Q7-11=BD140
R8-9-10-11=22ohm C2=1nF 100V MKT Q8-9-10=BD139
R19=82ohm C3-4=2.7nF 100V MKT Q12=IRF9540
R20=22Kohm C5=330pF ceramic or mylar Q13=IRF540
R23-26=56ohm C6-7=100uF 16V F1-2=Fuse 2.5A Fast
R24=2.2Kohm C8=1uF 100V MKT L1=see text [2]
R25=560ohm C9-11-12=100nF 100V MKT J1= 2pin connector 2.54mm step
R27-30=150ohm C10-13=470uF 63V
R28-29-31-34=15ohm C14=33nF 100V MKT Q8-10-11-12-13 on Heatsink
R32=150ohm 5W D1-2=LED RED 3mm [see text] [1] All the resistors is 1/4W 1% except quote differently


SPECIFICATIONS

POWER RATING at 1KHZ with 0.1% THD 63W/ 8 ohm, 105W /4 ohm
IMD <0.008%
THD at 60W into 8 ohm and 1 KHZ <0.005%
THD at 60W into 8 ohm and 20 HZ....20 KHZ <0.05%
FREQUENCE RESPONSE [at 35W/8ohm, +0...-3dB] 1.5 HZ.....125 KHZ
INPUT SENSITIVITY 1Vrms
ΙΝPUT IMPEDANCE 48K
SLOW RATE with input filter 20V/uS
SIGNAL TO NOISE RATIO [at 1W/8ohm] >99dBA
DAMPING FACTOR at 8ohm [20HZ...20KHZ] 160









Output Voltages For Power Supply


+V1=+35V -V1=-35V
+V2=+12V -V2=-12V
+V3=+35V -V3=-35V

Part List

T1=2X25Vac 160VA //2X15Vac 20VA C5-8=1000uF 25V IC2=7912 Regulator
T2=2X25Vac 160VA C6-9=100nF 100V MKT F1=FUSE 2A slow block
BR1-3=200V 35A Bridge Rectifier C7-10=10uF 25V S1=2X2 switch 10A
BR2=4 X 1N4002 C15=33nF 630V Class X2 JF1=3 pole male plug
C1...4-11...14=10000uF 63V IC1=7812 Regulator