August 1986

11

Philips Semiconductors

Product specification

HF/VHF power transistor

BLW78

List of components:

C1 = 33 pF ceramic capacitor (500 V)

C2 = 100 pF air dielectric trimmer (single insulated rotor type)

C3 = 280 pF air dielectric trimmer (single non-insulated rotor type)

C4 = 180 pF polystyrene capacitor

C5 = C6 = C7 = 3,9 nF ceramic capacitor

C8 = 2

× 33 pF ceramic capacitors in parallel (500 V)

C9 = 330 nF polyester capacitor

C10 = 82 pF ceramic capacitor (500 V)

C11 = 100 pF air dielectric trimmer (single insulated rotor type)

C12 = 180 pF air dielectric trimmer (single non-insulated rotor type)

C13 = 150 pF polystyrene capacitor

C14 = 390 nF polyester capacitor

L1 = 72 nH; 3 turns Cu wire (1,0 mm); int. dia. 7 mm; length 4,8 mm; leads 2

× 5 mm

L2 = Cu strip (28 mm

× 5mm × 0,2 mm); 18 mm at 3 mm above printed-circuit board

L3 = Ferroxcube choke coil (cat. no. 4312 020 36640)

L4 = 300 nH; 6 turns Cu wire (1,5 mm); int. dia. 12 mm; length 16 mm; leads 2

× 5 mm

L5 = 330 nH; 7 turns Cu wire (1,5 mm); int. dia. 12 mm; length 20,8 mm; leads 2

× 5 mm

R1 = 1,5 k

Ω (± 5%) carbon resistor (0,5 W)

R2 = 100

Ω (± 5%) carbon resistor (0,5 W)

R3 = 68

Ω (± 5%) carbon resistor (0,5 W)

R4 = 100

Ω wirewound potentiometer

R5 = 33

Ω (± 5%) carbon resistor (0,5 W)

R6 = 0,68

Ω (± 10%) wirewound resistor (7 W)

R7 = 120

Ω wirewound resistor (8 W)

R8 = 10

Ω (± 10%) carbon resistor (0,5 W)