Elektor Team
About the article

Audio Switchbox

Audio Switchbox
This circuit is intended as an extension for (pre-) amplifiers, to increase the number of inputs. Ever since the introduction of MD-recorders, DVD players, etc. the owners of older amplifiers have had a chronic shortage of inputs. The application of this switchbox also makes it possible to loop the audio outputs from the DVD player and video recorder to the audio system, without the need to turn on the TV. This is very handy when the audio installation is positioned some distance away from the video system and you only wish to listen to the sound from the DVD/MP3 player, for instance.
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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,R4,R7,R10 = 330kOhm
R2,R5,R8,R11 = 15kOhm
R3,R6,R9,R12 = 22kOhm
R13 = 120Ohm
C1-C4 = 1µ F 63V radial
C5 = 1000µ F 16V axial
D1,D2 = BAT85
D3-D6 = 1N4148
T1-T4 = BC547B
K1-K8 = cinch (RCA) socket, chassis mount
S1,S2,S3 = pushbutton
Re1,Re2 = RALD12W-K (12 V/960 Ohm ) Takamisawa (Conrad # 50 33 98-60)
BT1 = 9V battery with clip
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