Class A Non- Feedback Amplifier

 

Bill of Material

 

 

Printed Circuit Board - The Voltage Amplifier (One channel)
Ref. Figure 4, 5, 6

 
1   680 ohm 1/2 W Resistor, Metal oxide 1% R1
1 220 kohm 1/2 W Resistor, Metal oxide 1% R2
2 3.3 kohm 1/2 W Resistor, Metal oxide 1% R3,4
2 1.8 kohm 1/2 W Resistor, Metal oxide 1% R5,6
2 150 ohm 1/2 W Resistor, Metal oxide 1% R7,8
3 2SA872 Transistor Q9,11,14 See text
3 2SC1775 Transistor Q10,12,13 See text
1 2SK170BL JFET J15
1 2SJ74BL JFET J16
1 50 ohm Potentiometer P17 Bourns type 67W
1 680 ohm 1/2 W Resistor, Metal oxide 1% R18 See text
2 150 ohm 1/2 W Resistor, Metal oxide 1% R19,20
2 2SA872 Transistor Q21,23 See text
2 2SC1775 Transistor Q22,24 See text
1 24 kohm 1/2 W Resistor, Metal oxide 1% R25 See text
1 18 kohm 1/2 W Resistor, Metal oxide 1% R26 See text
1 8.2 kohm 1/2 W Resistor, Metal oxide 1% R27
2     LED, red D28,29
2 470 ohm 1/2 W Resistor, Metal oxide 1% R30,31
1 2SA872 Transistor Q32  
1 2SC1775 Transistor Q33  
2 180 ohm 1/2 W Resistor, Metal oxide 1% R34,35
1 2SA872 Transistor Q36  
1 2SC1775 Transistor Q37  
1 2SC3421 Transistor Q38 See text
1 2SA1358 Transistor Q39 See text
2 22 ohm 1/2 W Resistor, Metal oxide 1% R40,41
2 4700 µF 35 V Capacitor, Electrolytic C42,43 Lead distance 10 mm
2 100 nF 100 V Capacitor, MKT C44,45 Lead distance 5 mm
2 2SK170BL JFET J46,47 See text
2 47 ohm 1/2 W Resistor, Metal oxide 1% R48,49
2 LM329 1/2 W 6.9 V Reference D50,51
2 100 nF 100 V Capacitor, MKT C52,53 Lead distance 5 mm
2 4.7 kohm 1/2 W Resistor, Metal oxide 1% R54,55
2 470µF 63 V Capacitor, Electrolytic C56,57 Lead distance 5 mm
2 100 nF 100 V Capacitor, MKT C58,59 Lead distance 5 mm
2 330 ohm 1/2 W Resistor, Metal oxide 1% R60,61
3 2SC1815 Transistor Q62,63,69 See text
3 2SA1015 Transistor Q64,65,68 See text
2 1.5 kohm 1/2 W Resistor, Metal oxide 1% R66,67
2 10 kohm 1/2 W Resistor, Metal oxide 1% R70,71 See text
2 3.3 kohm 1/2 W Resistor, Metal oxide 1% R72,73  
2 1000µF 35 V Capacitor, Electrolytic C74,75 Lead distance 5 mm
2 100 nF 100 V Capacitor, MKT C76,77 Lead distance 5 mm
1 10 ohm 1/2 W Resistor, Metal oxide 1% R78 See text
1 1 Mohm 1/2 W Resistor, Metal oxide 1% R79  
1 1 µF 63 V Capacitor, MKT C80 Lead distance 5 mm
2 47 ohm 1/2 W Resistor, Metal oxide 1% R81,82 See text
3 2SA872 Transistor Q83,84,92 See text
3 2SK170BL JFET J85,86,89 See text
2 47 ohm 1/2 W Resistor, Metal oxide 1% R87,88  
1 100 ohm 1/2 W Resistor, Metal oxide 1% R90  
1 470 ohm 1/2 W Resistor, Metal oxide 1% R91  
2 22 kohm 1/2 W Resistor, Metal oxide 1% R93,96  
1 1 Mohm 1/2 W Resistor, Metal oxide 1% R94  
1 1 µF 63 V Capacitor, MKT C95 Lead distance 5 mm
1 47 pF Capacitor, Ceramic NP0 C97* Mounted on solder side
1 KBU405   4 A Rectifier D97  
1 Printed Circuit Board

 

Printed Circuit Board - The Buffer Amplifier (One channel)
Ref. Figure 2

 
        R101 Not mounted
1 8.2 kohm 1/2 W Resistor, Metal oxide 1% R102
2     LED, red D103,104
2 180 ohm 1/2 W Resistor, Metal oxide 1% R105,106
1 2SA872 Transistor Q107 See text
1 2SC1775 Transistor Q108 See text
2 2SC3421 Transistor Q109,118 See text
2 2SA1358 Transistor Q110,119 See text
2 2.2 kohm 1/2 W Resistor, Metal oxide 1% R111,112 See text
1 680 ohm 1/2 W Resistor, Metal oxide 1% R113 See text
1 1 kohm Potentiometer P114 Bourns type 67W
1 1.2 kohm 1/2 W Resistor, Metal oxide 1% R115 See text
1 10 ohm 1/2 W Resistor, Metal oxide 1% R116,117
1 220 ohm 1/2 W Resistor, Metal oxide 1% R120
1 2SC2922 Transistor Q121
1 2SA1216 Transistor Q122
2 0.3 ohm 30 W Resistor, Kool-Pak R123,124 Caddock type MP 930 (See text)
2 1.5µF 100 V Capacitor, MKC

C125,126

 Lead distance 27.5 mm
2 470µF 63 V Capacitor, Electrolytic C127,128 Lead distance 5 mm
1 Printed Circuit Board

 

Power Supply - The Buffer Amplifier (Two channels)
Ref. Figure 3
1 4 A 250 V Fuse, slow F1 Mains fuse (See text)
1 16 A Mains switch SW1
1 2x18 V 500 VA Transformer T1
2 35 A 400 V Rectifier D1, 2
4 22000 µF 35 V Capacitor, Electrolytic C1,2,3,4 See text

 

Power Supply - The Voltage Amplifier (Two channels)
Ref. Figure 3
Placed in Buffer Amplifier enclosure
1 1 A 250 V Fuse, slow F1 May be omitted
1 4 A Mains switch SW1 May be omitted
1 2x24 V 20 VA Transformer T1 2x22 V also possible
2 4 A 400 V Rectifier D1, 2 4A is a minimum
4 2200µF 35 V Capacitor, Electrolytic C1,2,3,4 Value not critical
         
 

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Copyright©2008

Knut Harald Nygaard