Audio Switchbox
Published in issue 312, July 2002
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.
Resistors:
R1,R4,R7,R10 = 330kOhm
R2,R5,R8,R11 = 15kOhm
R3,R6,R9,R12 = 22kOhm
R13 = 120Ohm
Capacitors:
C1-C4 = 1µ F 63V radial
C5 = 1000µ F 16V axial
Semiconductors:
D1,D2 = BAT85
D3-D6 = 1N4148
T1-T4 = BC547B
Miscellaneous:
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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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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