well as „OUT“ that can be connected easily to the Paradise PCB as well.
Bill of material
2
2SA1381
PNP power transistor
2
PF5102
n-JFET, IDSS=6mA, VTH = -1V
2
J107
n-JFET, IDSS=100mA, VTH=-3V
2
2.2Ohm
Resistor 0.5W
2
22Ohm
Resistor 0.5W
1
51Ohm
Resistor 0.5W
5
100Ohm
Resistor 0.5W
1
100kOhm
Resistor 0.5W
1
1MOhm
Resistor 0.5W
1
27Ohm
Resistor 0.5W
2
10Ohm
Resistor 0.5W
1
220Ohm
Resistor 0.5W
1
10uH
Inductor (see below)
1
2k
Trimpot 10 Turns, adjust from top
2
220pF
Foilcap 63V
1
220nF
Foilcap 63V
2
SK09
Heatsink Fischer, length 20mm
2
M3x10
mounting screw
2
M3x15
threaded bolt (nylon)
For the input transistors, also these can be used:
2SK170 (IDSS=8...8.5mA) / cascode: PN4391
For the output transistors, a lot of choice is possible:
BD 140 (Suffix -16) (Ccomp 180-220pF)
MJE/MJD 350 (Ccomp 100-47pF)
2SB 649/A (Suffix C oder D)
2SA 1930 (Ccomp 180-220pF)
MJE 253 (Ccomp 47-22pF)
Assembly of the PCB
The assembly of the components is straightforward. Just start with the resistors, then the
capacitors and trimpot, the transistors (pinout on the PCB is from left: Drain – Source –
Gate, looking on the flat side of the package). The power transistors need to be mounted
with the writing on top (pinout is from left: Emitter – Collector – Base, looking from top).
First, drill a hole in the heatsink, bend the leads of the transistor in the right position with a
flat plier, then tighten the heatsink together with the transistor to the PCB, and solder the
