• on Audio/Video/Photography
  • Published in issue 2/2009 on page 69
About the article

Mini VHF FM Receiver

Small in size, big on sound

Mini VHF FM Receiver
These days tiny FM radios are often integrated in many portable devices such as mobile phones and MP3 players. But why not make a simple receiver ourselves? There are currently several nice ICs available that contain a (nearly) complete receiver. For this project we cast our eye on the TDA7021T from ST-NXP Wireless.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors (SMD 0805)
R1 = 8kO2
R2 = 10kO
R3 = 390O

Capacitors (SMD 0805)
C1,C3 = 10nF
C2,C6,C9,C16 = 100nF
C4 = 33pF
C5 = 25pF trimmer (Murata type TZB4Z250AB10R00)
C7,C10 = 1nF5
C8 = 820pF
C11 = 1nF
C12 = 68pF
C13 = 220pF
C14 = 47µF 10V (Nichicon UWX1A470MCL1GB 5.5mmL chip type)
C15 = 3nF3

Inductors
L1 = 36nH (4 turns 0.5mm silver-plated wire, inside diameter 4mm; length 7mm)
L2 = 1µH, SMD case 0805 (fres > 300 MHz)

Semiconductors
IC1 = TDA7021T (SMD in SO16 case)

Miscellaneous
K1,K2 = 2-way pinheader
BT1 = 2-way pinheader + battery holder for 2-4 AA batteries

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