power amplifier 45w hexfet gr

Power Amplifier 45W with HEXFET

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�� , �� . �� . � �� IC1. � �� R5 �� TR2/R6, �� FET�s �� . �� Q1-2 �� , �� IC1 �� 18V. � �� IC1, �� 2mA, �� R5 �� TR2/R6 �� 2.4 �� 2.6Volts. � �� Q3-4 �� Wilson �� TR1. � �� TR2 �� R5 �� DC offset �� TR2+R6 �� R5. �� TR2 �� DC offset �� R6 �� R5. �� Q5�.8, �� , �� Push-Pull, �� , �� 75%. �� Q4 �� Q5-6 �� , �� , �� . �� , � �� FET �� . �� Q5-6 �� Q4. �� Vbe �� Q4 �� 钒 �� R5, �� Vgs �� Q5-6. �� . �� FET,�� . �� C8-9 �� . �� 200mA �� : 1] �� F1-2, �� 10� 1W. 2]�� . �� TR1 �� 2V. �� . �� TR1. �� F1-2. 3] �� TR2 �� [J2-2] , �� , �� 30mV (�� ). �� IC1 �� LF411, LF351, AD711.

Part List

R1=47Kohm	C1-2-6-7=100nF 100V MKT	Q5-6=IRF9540
R2-12=1Kohm	C3-4=22uF 25V	Q7-8=IRF540
R3-4=3.3Kohm	C5=220pF styroflex	TR1=5Kohm trimmer multiturn
R5=1.2Kohm	C8-9=4700uF 63V	TR2=1Kohm trimmer multiturn
R6=[1.2Kohm] 820ohm *See text	C10=1uF 100V MKT	F1-2=fuse 3A
R7=270ohm	D1-2=15V 0.5W zener	J1=2pin connector 2.54mm step
R8=220ohm	IC1=LF411orAD711or LF351	J2=5pin connector 5mm step
R9=27Kohm	Q1=BC550C
R10-11=22Kohm	Q2=BC560C	All Resistors 1/4W 1% metal film
R13-14-15-16=150ohm	Q3-4=BC547B

Power Supply

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Fig.2--POWER SUPPLY

�� . �� 45W HEXFET �� . �� , �� , �� , �� . �� , �� . �� . �� . �� DC.

	Supply Output Voltages
	+V1=+32V	-V1=-32V
	+V2=+12V	-V2=-12V
	+V3=+32V	-V3=-32V

DC Protection / Time Delay for Loudspeaker

Power Supply Part List

T1=2X22Vac 3A //2X15Vac 0.5A	C5-8=1000uF 25V	IC2=7912 Regulator
T2=2X22Vac 3A	C6-9=100nF 100V MKT	F1=FUSE 2A slow block
BR1-3=400V 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

SPECIFICATION
Power [rms]	45W in 8 ohm
Power [rms]	75W in 4 ohm
T.H.D	0.2% in 40W
Frequency Response	5-20KHZ �1dB
Input Impedanse	47K

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Sam Electronic Circuits 6/02

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