Chapter Ⅱ "MOSFET OPS" ( configuration )

　Complementary Feedback MOSFET OPS

Sam Electronic Circuits   © Sam 2001-2013           

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Power Amplifier 65W 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