March 1993

11

Philips Semiconductors

Product specification

HF/VHF power transistor

BLW85

List of components:

TR1 =

TR2 = BD137

C1

=

100 pF air dielectric trimmer (single insulated rotor type)

C2

=

27 pF ceramic capacitor (500 V)

C3

=

180 pF polystyrene capacitor

C4

=

100 pF air dielectric trimmer (single non-insulated rotor type)

C5

=

C7 = 3,9 nF polyester capacitor

C6

=

2

× 270 pF polystyrene capacitors in parallel

C8

=

C15 = C16 = 100 nF polyester capacitor

C9

=

2,2

µF moulded metallized polyester capacitor

C10 =

2

× 385 pF (sections in parallel) film dielectric trimmer

C11

=

68 pF ceramic capacitor (500 V)

C12 =

2

× 82 pF ceramic capacitors in parallel (500 V)

C13 =

47 pF ceramic capacitor (500 V)

C14 =

385 pF film dielectric trimmer

L1

=

88 nH; 3 turns Cu wire (1,0 mm); int. dia. 9 mm; length 6,1 mm; leads 2

× 5 mm

L2

=

L5 = Ferroxcube choke coil (cat. no. 4312 020 36640)

L3

=

68 nH; 3 turns enamelled Cu wire (1,6 mm); int. dia. 8 mm; length 8,3 mm; leads 2

× 5 mm

L4

=

96 nH; 3 turns enamelled Cu wire (1,6 mm); int. dia. 10 mm; length 7,6 mm; leads 2

× 5 mm

R1

=

27

Ω (±5%) carbon resistor (0,5 W)

R2

=

4,7

Ω (±5%) carbon resistor (0,25 W)

R3

=

1,5 k

Ω (±5%) carbon resistor (0,5 W)

R4

=

10

Ω wirewound potentiometer (3 W)

R5

=

47

Ω wirewound resistor (5,5 W)

R6

=

150

Ω (±5%) carbon resistor (0,25 W)