About the article

Bidirectional Stereo Input Selector

1-to-4 or 4-to-1, a trouble-free audio add-on, suitable for beginners

Bidirectional Stereo  Input Selector
Following a recent appeal* made in the magazine calling on our readers to send us their own circuit designs—if possible simple and preferably in fields that receive less coverage in Elektor, like audio, for example—we received this suggestion which meets the two main criteria: uncomplicated and intended for processing sound signals.
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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.

Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
Resistors (.25W, 1%):
R1,R7,R9,R11,R18–R21 = 100Ohm
R2–R5 = 1.2kOhm
R6,R8,R10,R12 = 390Ohm
R13–R17 = 1kOhm
R22 = 560Ohm
R23,R24 = 100kOhm
C1 = 0.1 µF 100V, ceramic disc
C2 = 10µF 100V electrolytic
C3 = 1000µF 25V electrolytic
C4 = 1µF 63V electrolytic
C5 = 10pF 100V, ceramic disc
D1–D4 = 1N4148
D5–D8,D13 = LED, 5mm, yellow
D9–D12 = 1N4004
IC1 = LM7805CT
IC2 = CD74HC175E
F1 = fuse, 500mA, fast
K1–K10 = RCA (line) audio socket, PCB mount
Re1–Re4 = relay, DIL, PCB mount, e.g. MEDER type DIP05-2A72-21D
S1–S4 = pushbutton w. make contact
TR1 = power transformer, secondary 9V @ 2VA

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