ndak ah ... idup kok ......
Instead of the BF900, a BF905, BF907 or BF961 can be used without any
problems. Maybe a BF981 would do also, but that I haven't tested.
COMPONENT LIST
Resistors:
(All resistors are metalfilm types except R1 which is a carbon resistor)
R1 : 47k, 1/8 W R5 : 220k, 1/8 W
R2 : 47k, 1/8 W R6 : 100k, 1/8 W
R3 : 47k, 1/8 W R7 : 150E, 1/8 W
R4 : 100E, 1/8 W R8 : 10k, lin. pot
Capacitors:
C1: 100 nF Multilayer or ceramic C8 : 1 nF ceramic
C2: 4.7 pF ceramic C9 : 1 nF ceramic
C3: 100 nF ceramic C10: 100 nF ceramic
(1 or 10 nF will do also) C11: 100 nF ceramic
C4: 40 pf trimmer C12: 100 nF ceramic
C5: 4.7 pF ceramic C13: 47 uF/25V
C6: 10 pF ceramic C14: 1 nF ceramic
C7: 22 pF ceramic
Inductors:
L1 : 4 wdg, dia 8 mm, 1 mm CuAg, space 1 mm;
Mounted 8 mm above PCB (Leads are 4 mm)
L2 : 6-hole ferroxcube wideband HF-choke (5 wdg)
L3 : 6-hole ferroxcube wideband HF-choke (5 wdg)
Others:
Q1 : BF900
D1 : BB405,BB102 or equal (most varicaps with C = 2-20 pF (approx) will do)
U1 : uA78L08, uA7809, uA7810 or equal (MC78LXX, UC78LXX etc)
