Class A Current Feedback Amplifier

 

Bill of Material

Printed Circuit Board (One channel)

1   1 kohm 1/2 W Resistor, Metal oxide 1% R1
1 100 kohm 1/2 W Resistor, Metal oxide 1% R2
2 3.3 kohm 1/2 W Capacitor, Ceramic NP0 R3,4
2 1.8 kohm 1/2 W Resistor, Metal oxide 1% R5,6
2 470 ohm 1/2 W Resistor, Metal oxide 1% R7,8
1 2SC1775 Transistor Q9
1 2SA872 Transistor Q10
1 2SK170BL JFET J11
1 2SJ74BL JFET J12
1 50 ohm Potentiometer P13 Bourns type 67W
1 1 kohm 2 W Resistor, Metal oxide 5% R14  
1 47 ohm 1/2 W Resistor, Metal oxide 1% R15
1 2SA872 Transistor Q16
1 2SC1775 Transistor Q17
1 1.8 kohm 1/2 W Resistor, Metal oxide 1% R18
2 82 ohm 1/2 W Resistor, Metal oxide 1% R19,20
1 2SC3421 Transistor Q21
1 2SA1358 Transistor Q22
2 5.6 kohm 1/2 W Resistor, Metal oxide 1% R23,24
2 47 pF Capacitor, Ceramic NP0 C25,26
1 1 kohm 1/2 W Resistor, Metal oxide 1% R27
1 220 ohm 1/2 W Resistor, Metal oxide 1% R28
1 200 ohm Potentiometer P29 Bourns type 67W
2 2SC3421 Transistor Q30,31  
1 2SA1358 Transistor Q32
1 220 ohm 1/2 W Resistor, Metal oxide 1% R33
1 2SC2922 Transistor Q34
1 2SA1216 Transistor Q35
2 0.33 ohm 6 W Resistor, Non-inductive R36,37 Alternative: 6 pcs 1 ohm 2 W Metal oxide
2 22 ohm 1/2 W Resistor, Metal oxide 1% R38,39
2 4700 µF 35 V Capacitor, Electrolytic C40,41 Lead distance 10 mm
2 100 nF 100 V Capacitor, MKT C42,43 Lead distance 5 mm
2 1.5µF 100 V Capacitor, MKC

C44,45

Lead distance 27.5 mm
1 22000 µF 35 V Capacitor, Electrolytic C46,47 Lead distance 10 mm
1     Connector X0  
5     Connector X48-51 Lead distance 5 mm
1 10 ohm Resistor R52
1 Printed Circuit Board
 

 

Power Supply (Two channels)

1 4 A 250 V Fuse, slow   Mains fuse
1 16 A Mains switch  
1 2x18 V 500 VA Transformer  
2 35 A 400 V Rectifier D1, 2
2 100 nF 400 V Capacitor, Plastic C1, 2
2 4 A 250 VA Fuse, slow F1, 2
         
 

 

Copyright©2004

Knut Harald Nygaard