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Alignment-free FM Detector

Alignment-free FM Detector
This 455-kHz quadrature detector for narrow-band FM signals boasts two important advantages: it is pleasantly simple and it does not require any alignment.The heart of the circuit is formed by the well-known NE612 IC, which is a double-balanced mixer cum oscillator in an 8-pin DIL package.The signal is first buffered by T1 and then fed to the input of the NE612. At the same time, a small portion of the signal is passed to the mixer via a low-value capacitor (C4).
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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1,R2 = 560kOhm
R3 = 47Ohm
C1 = 22nF
C2,C3,C5 = 10nF
C4 = 33pF
C6 = 100pF
C7 = 82nF
C8 = 100nF
L1 = 820µH
T1 = BC547
IC1 = NE612AN
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