Class A Amplifier

 

Bill of Material

Printed Circuit Board (One channel)

1   20 kohm 1/2 W Resistor, Metal oxide 1% R0
1 1.8 kohm 1/2 W Resistor, Metal oxide 1% R1
1 100 pF Capacitor, Ceramic NP0 C2
2 4.7 kohm 1/2 W Resistor, Metal oxide 1% R3,4
2 2.7 kohm 1/2 W Resistor, Metal oxide 1% R5,6
2 680 ohm 1/2 W Resistor, Metal oxide 1% R7,8
1 2SC1775 Transistor Q9
1 2SA872 Transistor Q10
1 2SK170GR JFET J11
1 2SJ74GR JFET J12
1 50 ohm Potentiometer P13 Bourns type 67W
1 2.2 kohm 1/2 W Resistor, Metal oxide 1% R14
1 100 ohm 1/2 W Resistor, Metal oxide 1% R15
1 2SB716 Transistor Q16
1 2SD756 Transistor Q17
1 1 kohm 1/2 W Resistor, Metal oxide 1% R18
2 56 ohm 1/2 W Resistor, Metal oxide 1% R19,20
1 2SC2238 Transistor Q21
1 2SA968 Transistor Q22
2 5.6 kohm 1/2 W Resistor, Metal oxide 1% R23,24
2 22 pF Capacitor, Ceramic NP0 C25,26
1 330 ohm 1/2 W Resistor, Metal oxide 1% R27
1 150 ohm 1/2 W Resistor, Metal oxide 1% R28
1 200 ohm Potentiometer P29 Bourns type 67W
1 2SC2238 Transistor Q30
2 56 ohm 1/2 W Resistor, Metal oxide 1% R31,32
1 2SC2238 Transistor Q33
1 2SA968 Transistor Q34
4 4.7 ohm 1/2 W Resistor, Metal oxide 1% R35,36,37,38
2 0.22 ohm 5 W Resistor, Wire wound R39,40
1 2SA1216 Transistor Q41
1 2SC2922 Transistor Q42
1 2.2 µH Coil (see text) L43
1 8.2 ohm 3 W Resistor, Wire wound R44
1 33 nF 400 V Capacitor, MKC C45 Lead distance 10 mm
2 100 nF 100 V Capacitor, MKT C46,47 Lead distance 5 mm
2 470 µF 63 V Capacitor, Electrolytic C48,49
2 47 ohm 1/2 W Resistor, Metal oxide 1% R50,51
2 2.2 µF 100 V Capacitor, MKC C52,53 Lead distance 22.5 mm
2 100 µF 63 V Capacitor, Electrolytic C54,55
1 Printed circuit board
 

 

Power Supply (Two channels)
1 4 A 250 V Fuse, slow F1
1 16 A Mains switch S2
1 2x18 V 500 VA Transformer T3
1 35 A 600 V Rectifier V4
2 47000 µF 40 V Capacitor, Electrolytic C5,6
1 2x22 V 50 VA Transformer T7
1 15 A 600 V Rectifier V8
2 6800 µF 63 V Capacitor, Electrolytic C9,10
 

 

Copyright©1999

Knut Harald Nygĺrd