• on Audio/Video/Photography
  • Published in issue 12/2008 on page 32
About the article

Hi-fi Wireless Headset

2.4 GHz digital audio link

Hi-fi Wireless Headset
Although they’ve been on the shelves of audio and video equipment retailers for quite a few years now, wireless headsets have been conspicuously absent from hobby electronics magazines. It has to be said that building this sort of headset, especially if we set ourselves a certain level of quality, is far from simple — or rather, was far from simple, until some recently-brought-out modules came along to help us out.
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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.

0.5 or 0.25 watt, metal film, 5%
R1 = 220O (270O for 2.4 module)
R2 = 360O (E96: 357O) (820O for 2.4 module)
R3 = 820O (1kO5 for 2.4. module)
R4,R6 = 20kO0
R5,R7 = 30kO0 (E96: 30kO1)
C1 = 470µF 25V radial, lead pitch 5mm
C2,C3 = 100 nF ceramic, lead pitch 5mm
C4 = 100µF 25V radial, lead pitch 2.5 mm
C5 = 10 nF ceramic, lead pitch 5mm
C6,C7 = 2µF2 MKT, lead pitch 5 or 7.5mm
D1 = 1N4004
D2 = LED, red, low current
IC1 = LM317 (TO220)
K1 = PCB screw terminal block, lead pitch 5mm
K2 = 3-way pinheader
K3 = 2-way pinheader
S1 = DIL switch block, 10 contacts
S2 = pushbutton, 1 contact
Module1 = TXAUDIO2.4/AE (Aurel.) + 2 x 8 pin connector with 2.0 mm lead pitch (e.g. Molex type 872641652, Farnell # 856-0145)
PCB, no. 080647-1

0.5 or 0.25 watt, metal film, 5%
R1 = 270
R2 = 22
R3 = 820
R4,R23 = 1kO5
R5,R13 = 47k
R6,R7,R14,R15 = 8kO2
R8,R16 = 2kO2
R9,R17 = 100k
R10,R18 = 1k
R11,R19 = 10k
R12,R20 = 100
R21,R22 = 4kO7
P1 = 50O preset
P2 = 10kO potentiometer, dual linear (Vishay-Sfernice type P9A2RFISX1BB2103MAE3)
P3 = 10kO potentiometer, dual logarithmic (Vishay-Sfernice type P9A2RFISX1BB2103MLE3)
C1,C4 = 470µF 25V, radial, lead pitch 5mm
C2,C3,C9,C10,C15,C16 = 100nF, ceramic, lead pitch 5mm
C5,C8,C11,C14 = 2µF2, MKT, lead pitch 5 or 7.5mm
C6,C12 = 820pF
C7,C13 = 560pF
C17 = 10nF ceramic, lead pitch 5mm
D1 = 1N4004
D2,D3 = LED red, low current
T1 = BC547B
IC1 = LM317 (TO220)
IC2,IC3 = OPA2134PA (DIP8)
K1 = 2-way pinheader
K2 = 3-way pinheader
J1 = 3-way pinheader with jumper
S1 = DIL switch block, 10 contacts
S2 = pushbutton, 1 contact
BT1,BT2 = 9V PP3 battery with clip-on lead (optionally with double-pole switch)
Module1 = RXAUDIO2.4 (Aurel) + 2 off 2 x 8 contacts with 2.0mm lead pitch (e.g. Molex type 872641652, Farnell # 856-0145)
PCB no. 080647-2

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