VHF-Low Explorer
A low-cost NBFM receiver for 68-88 MHz
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Component list
R1=100kOhm
R2=150kOhm
R3=100Ohm
R4=22kOhm
R5=330kOhm
P1=50kOhm logarithmic potentiometer
P2=50kOhm linear potentiometer
Capacitors:
C1=39pF
C2=27pF
C3,C6,C14=10nF
C4,C11,C13,C19,C23,C24,C25,C26,C29=100nF
C5,C12=1nF, lead pitch 5mm
C7=100nF, lead pitch 5mm
C8=220pF
C9,C18=330pF
C10=10pF
C15,C17=3nF3, lead pitch 5mm
C16=180pF
C20=22pF PTFE trimmer
C21=150pF
C22=100pF
C27=2nF2
C28=10µF 16V radial
C30,C31=100µF 16V radial
Inductors:
L1=100nH (brown, black, silver)
L2=330nH (orange, orange, silver)
L3=180nH (brown, grey, silver)
Semiconductors:
D1=BB911
T1=BF981
IC1=TDA7000
IC2=78L05
IC3=LM386 N4
Miscellaneous:
8 ohm, 1 watt miniature loudspeaker
Diecast case: e.g., Hammond type 1590B
9V battery (PP3 / 6F22) with clip-on leads
PCB, order code 020416-1
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