High-End Audio Modular Preamplifier

High-End Audio Modular Preamplifier

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�� , �� , �� , �� . �� , �� , �� . �� modular �� . �� . � �� , �� , �� . �� , �� . �� . �� . �� . �� , �� Balance [RV1], �� . �� module �� . �� , �� . �� "��" �� [MONO] �� .

Input selector

preamplifier_modular_sel.gif (15674 bytes)

Main Preamplifier

preamplifier_modular_main.gif (47659 bytes)

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� �� [Fig.1A]. � �� S1 � �� 12 ��, �� . �� Led. �� Led �� . � �� +12V [+V4]. � �� S2 �� S1, �� Led, �� . �� IC1 [Fig.1B]. �� , �� . �� PHONO [RIAA Filter] �� module PHONO [J11] �� block �� . �� module �� connector [J11]. �� 33 ��, �� PHONO. �� , �� J11 �� P1-2 �� RL1-6. � �� , �� module Buffer [J12-13]. � �� , �� . �� BALANCE [RV1a-b] �� VOLUME [RV2a-b] �� . �� . �� VOLUME �� [MUTE] �� R21-22 �� RL11 �� R21. �� R21, �� . �� S3 �� D22, � RL11 ��, � �� R21 �� R23 �� [-20dB]. � �� R23-24. �� J16-17 �� module Line �� . �� RL12 �� .

�� module PHONO

Phono RIAA Preamplifier 1

Phono RIAA Preamplifier 2

�� module BUFFER

Class A buffer amplifier [��]

�� module LINE OUT

Symmetrical Audio Class A preamplifier3 [��]

Symmetrical Class A [1]

Symmetrical Class A [2]

Class A Line preamplifiers

Part List for Modular Preamplifier [Fig.1a-b]

R1-2-27=1Kohm metal film 1%	C1-2=10uF 25V	IC1=TL072 - NE5532 - OP275
R3-4=100Kohm metal film 1%	C3-4=47nF 63V MKT 5%	S1-2=1X12 step Rotary Selector
R5-6-7-8-9-10-11-12=47Kohm metal film 1%	RV1=2X22Kohm Lin. Pot. [Alps]	S3=1X2 step mini switch
R13-14-15-16=1Mohm metal film 1%	RV2=2X10Kohm Log. Pot. [Alps Black or Blue]	RL1....12=12V 2 places 2 contact [Finder -Omron]
R17-18=100ohm metal film 1%	D1-2-3-4-5=LED Red 3mm or your selection	J1....10=RCA Type Female gold-plated plug
R19-20-25-26=100Khom metal film 1%	D6-7-8-9-10=1N4148	J11-12-13-16-17=10pin Female connector 2.54mm step [Gold]
R21-23=100Kohm metal film 1%	D11-12-13-14-15-23=LED Red 3mm or your selection	J14-15-18-19-20=RCA Type Female gold-plated plug
R22-24=10Kohm metal film 1%	D16-17-18-19-20-21=1N4148	For ICs Techical Data see my Database

��, �� Remote Unit

preamplifier_modular_supply.gif (44717 bytes)

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�� . �� , ��. �� , �� . �� JF1 �� . � �� 1 �� . �� IC4,5,6,7 �� TR1,2,3,4. � �� +/-15V �� +/-18V �� . �� PHONO �� IC2,3 �� +/-15V. � �� +12V �� IC8. �� RL, �� Remote. � �� [0VD] �� [0VA] �� , �� C6,7,8,9 [See Fig.5]. �� , �� . �� . �� , �� .

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�� , �� . �� . �� , �� IC9 �� . �� IC9 �� . �� S4 � �� 1 �� D32,34 �� R32 �� D35 �� +12V. � �� IC9A �� High �� R33 �� C36 � �� , �� 5 �� [�� C36]. �� C36 � �� IC9� �� High �� Q1 �� , � �� D37 ��, �� RL12, �� [Fig.1] ��. �� S4 �� 1 �� 1,2 �� IC9A �� RL12 �� , �� , �� .

�� Remote

�� Remote �� . �� C36 �� IC9C �� High �� Q2 �� , � �� D39 �� RL13 �� , �� JF1 �� JF2. �� +12V �� J20, �� . �� RL13, �� . � �� , �� JF2 �� , �� , Cd player, Tuner ��. �� RL13 �� . �� 230Vac �� . �� , �� , �� .

Part List for Power supply-Delay time and Remote Unit [Fig.2]

R28-29-30-31=220ohm 1/4W metal film 1%	C24-26-28-30-32-33=100nF 63V MKT 5%	D35=12V 1W Zener
R32=1Kohm 1W 5%	C25-29-27-31-34=10uF 25V	D37-39=LED 3mm
R33=1Mohm 1/4W metal film 1%	C35=100uF 63V	Q1-2=BD678
R34=10Kohm 1/4W metal film 1%	C36=4.7uF 25V	T1=230Vac//2X15V 50VA Toroidal Transformer
R35-38=39Kohm 1/4W metal film 1%	C37=47nF 63V MKT 5%	RL13=12V Relay 2X2 [20A] [Finder -Omron]
R36-37-39=1Kohm 1/4W metal film 1%	IC2=LM7815 or LM7818	F1=5 x 20mm 1A slo blo [AC Main Fuse]
R40=1.2ohm 1/4W 5%	IC3=LM7915 or LM7918	S4=2X2 Switch 10A per contact
TR1-2-3-4=4.7Kohm trimmer	IC4-6=LM317 [�� ] [see text]	JF1=3pin male supply jack with EMI Filter
C5=22nF 300Vac [Y2/X1 Class] MKT 20%	IC5-7=LM337 [�� ]	JF2=3pin female supply jack
C6-7-8-9=10000uF 35V	IC8=LM7812 [�� ]
C10-11-12-13=100nF 63V MKT 5%	IC9=4081 [AND C-mos]
C14-15-17-19-21-23=10uF 25V	B1=Bringe Rectifier [B80 C5000-3000]	All the MKT capacitors is polyester
C16-18-20-22=100nF 63V MKT 5%	D23.....34-36-38=1N4002	For ICs Techical Data see my Database

Modular Preamplifier Technical Data Typical
	Input Selections	5 stereo sources
	Input Impedance	47K ohms
	Audio Outputs	1X Stereo Rec, 1X stereo Main
	Main Output Impedance	100 ohms
	Recording Output Impedance	100 ohms
	Output Voltage	1.2 VRMS
	Frequency Response	DC to 100KHZ +-0.10 dB typ.
	Distortion	Less than .01% THD and IM typ.
	Crosstalk	Greater than 90 dB typ.
	Noise	105 dB A Weighted @ 1 KHz typ.
	Mute Switch Attenuation	0, -20 dB attenuation
	Delay time out Protection	~5 sec
	Remote outputs	+12V [Protected], AC Line
	Delay time Remote output	~5 sec
	AC Line Voltage	120/230 volts 60/50 HZ
	AC Voltage Range	+-10%

�� Buffer and Gain module

preamplifier_modular_buf_gain.gif (13478 bytes)

Fig.3 Fig.4

�� Fig.3-4 �� , �� , �� . �� Fig.3 �� IC1 �� . �� . �� [TR1] �� [Offset voltage] �� . �� TR1 �� . �� 5 �� 8 �� IC1 �� 22pF � �� . � �� C6-8 �� . �� R5 �� [A=R5+R6/R6]. �� C3,4,8,9 �� . �� R1,5,8,9 �� C1,2,10,11 �� . �� R7,11 �� . �� [Buffer] �� IC2 �� . �� IC2 �� FET �� , �� . �� , �� . �� .

Part List for Buffer and Gain Units [Fig.3-4]

R1-2-8-9=47ohm 1/4W 1% metal film	C1-2-10-11=47uF 25V	IC2=NE5534 - TL071 - OP07C-LF411-OPA604
R3-6-12=1Kohm 1/4W 1% metal film	C3-4-8-9=100nF 63V MKT	J1-2=10pin pointed male connector 2.54mm step
R4-13=47Kohm 1/4W 1% metal film	C5=1.5nF 100V MKT or stypoflex
R5=6.8Kohm 1/4W 1% metal film	C6-7=22pF 100V ceramic or stypoflex	All the MKT capacitors is polyester 5%
R7-11=100hm 1/4W 1% metal film	IC1=NE5534-OPA604	For ICs Techical Data see my Database

Ground and Supply Lines Block Diagram [Fig.5]

preamplifier_modular_block.gif (23544 bytes)

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High-End Audio Modular Preamplifier in English

Sam Electronic Circuits 03/04

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