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Need help with a Random Audio Switcher
Need help with a Random Audio Switcher
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Old 18th April 2018, 10:33 AM   #1
peckersonth is offline peckersonth  Germany
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Default Need help with a Random Audio Switcher

Hello diyAudio Community,

i have a problem with a circuit maybe you can help me with.

I need for an exhibition an audio switch which switches 9 inputs to 1 output at a random rate. Only 1 input at the time is active.

The input is stereo via 3.5mm jack so is the output.

The problem i have is that i have a really bad crosstalk on the channels

Audio Switch_Leiterplatte.jpg

I use an ADG409 for the switching an atmega328 as a controller
Vdd is 5v Vss is tied to GND

What can I do to remove the crosstalk / noise ?
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Old 18th April 2018, 11:45 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Location: The Jurassic Coast, England. GB
Schematic would be useful.
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Old 18th April 2018, 06:22 PM   #3
epicyclic is offline epicyclic  United Kingdom
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What are the signal levels of the inputs .
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Old 18th April 2018, 06:27 PM   #4
PRR is offline PRR  United States
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Location: Maine USA
Your inputs swing above and below common.

The switch chip is powered with +5V and common, and does not do a right thing when inputs go outside this range.

I am thinking that all negative swings on all inputs are breaking-over inside the switch chip.

You could R-C couple all inputs and outputs to a mid-way voltage reference.

You could re-arrange the whole power scheme centered +/- around common; this does complicate the logic interfacing.

Frankly, since the board is built and you have 12V, _I_ would get 9 electromechanical relays to do the audio, coils driven by DC power through the ADG switches (backward). It is klunky but gets the project finished quick.
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Old 19th April 2018, 07:33 PM   #5
peckersonth is offline peckersonth  Germany
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Thank you PRR I will re-arrange the power scheme and will try a +15 and -15 V supply. And I will add 10k resistors between audio and audio gnd. i will post the new Schematic soon.
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Old 20th April 2018, 07:27 AM   #6
peckersonth is offline peckersonth  Germany
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Join Date: Apr 2018
Hello diyAudio Community,

i got a new Semantic can anyone take a look ? And give me advice ?

AudioSwitchv2_Schaltplan.jpg

Greetings Tim
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