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Old 28th July 2013, 06:08 AM   #21
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Join Date: Mar 2007
Location: California
With the user interface more or less worked out on the Arduino, I decided to build up a test circuit for my input switcher on a breadboard. Even though it is a bit of a rats nest, it works - at least I can get SPDIF to run through it at 48kHz. The multiplexer IC that I am using has an enable pin, and I can change the state of that to mute the system without having to generate an "all zeros" SPDIF signal. Very convenient.

Tomorrow I check that 192kHz will pass through unscathed. Then I need to add code to the Arduino to set the pins that control the multiplexer so that I can test its input switching functionality. I don't expect any issues there.

After that I will need to test out the volume control circuitry. There is a thread around here somewhere on that already:
NEED ADVICE: controlling Mini2x4 volume when using digital inputs

So far this project is looking promising!

-Charlie
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Old 28th July 2013, 09:23 PM   #22
diyAudio Member
 
Join Date: Mar 2007
Location: California
I tested out the input switcher at a few different sample rates - the highest that it will pass is 96kHz. But in another forum thread, someone pointed out to me that the stray capacitance and contact resistance of a breadboard tend to cause circuits that have signals above a few MHz not work, and this is probably the case with my little hack job:

Click the image to open in full size.

I'll have to transfer the circuit over to a prototyping PC board where everything can be soldered down, component leads trimmed, etc. and then retest it.
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Old 9th December 2013, 01:16 AM   #23
Dresden is offline Dresden  Czech Republic
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Join Date: Oct 2008
Default Interesting Project

What is the present state of the project?

I have for quite some wanted a system which can send separate signals to powered speakers.

In the last few days, I resumed my search, and not finding anything comparable, I had resolved to making a list of potential retail components (such as the SONOS product), for possible use in sending a signal to two powered loudspeakers. (I also only want a power cord for each speaker, nothing more.)

If you can design something which can match the performance of the SONOS (albeit at a more affordable price) in the foem of a module for DIY/OEM, I am interested. (Perhaps you have already accomplished such?)


Quote:
Originally Posted by Charl
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I tested out the input switcher at a few different sample rates - the highest that it will pass is 96kHz. But in another forum thread, someone pointed out to me that the stray capacitance and contact resistance of a breadboard tend to cause circuits that have signals above a few MHz not work, and this is probably the case with my little hack job:

Click the image to open in full size.

I'll have to transfer the circuit over to a prototyping PC board where everything can be soldered down, component leads trimmed, etc. and then retest it.
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