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Old 13th September 2005, 06:31 AM   #1
Splash is offline Splash  United Kingdom
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Talking Need help with simple project

Hiya,
I'm hoping one of you guys can give me a hand with a project im working on. after browsing the forums it seems like it should be pretty easy for you. Ive made some regular electronic projects but im pretty new to audio electronics.

Basicaly i have a problem where i have lot of audio outputs from various sources such as DVD player, VHS player, TV, PS2, Laptop, Desktop, Stereo. and have a good few inputs such as Surround sound, Headset, Wireless headphones, TV etc etc. At the moment i am constantly crawling under and behind my desk when i want to change what im hearing and how.

So, I have come up with the idea of having an audio junction box, where i have a plastic enclosure box, on one side i have a row of inputs phono and 3.5mm jack, and on the other side I have a row of 3.5mm outputs, all of which has its own switch so i can turn in/outputs on and off.

Here is a picture of the basic layout, but im not sure of what it will do to the sound quality and if i need some sort of op amp or what.

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Old 13th September 2005, 09:51 AM   #2
Splash is offline Splash  United Kingdom
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Sorry just to clarify, I'm not asking anyone to build it for me, simply what is missing from my picture, and if it will work or not
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Old 13th September 2005, 12:51 PM   #3
rabbitz is offline rabbitz  Australia
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Just connect your inputs to a rotary switch and your outputs to one as well.

2 pole 6 position break before make like these will do the job.

http://www.altronics.com.au/index.as...=item&id=S3022

Inputs to the outside connectors (input sw) > out from the inside 2 connectors (input sw) > inside 2 connectors (output sw) > outside connectors (output sw)

Better than having individual switches that you can forget to turn off and have 4 sources playing at once.
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Old 13th September 2005, 07:01 PM   #4
Splash is offline Splash  United Kingdom
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Ok,
I've never used rotary switched before and am not certain how they work, is this what you mean and how they work?

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Old 13th September 2005, 09:14 PM   #5
ctardi is offline ctardi  Canada
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That would work. You sould download expressPCB, comes with a free schematic program.
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Old 14th September 2005, 11:56 AM   #6
rabbitz is offline rabbitz  Australia
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Keep your left channel to 1 pole and right channel to the other pole. You've got the idea but make sure you don't join the RCA inputs as you have shown.... treat it the same as the 3.5mm jacks.

All the grounds on the inputs and outputs are joined together at 1 point and bypass the switches.... only hot wires on the switches.
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Old 18th September 2005, 09:36 AM   #7
Splash is offline Splash  United Kingdom
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Quote:
Keep your left channel to 1 pole and right channel to the other pole. You've got the idea but make sure you don't join the RCA inputs as you have shown.... treat it the same as the 3.5mm jacks.

All the grounds on the inputs and outputs are joined together at 1 point and bypass the switches.... only hot wires on the switches.
Hmm, Not really sure what you mean. should the RCA have their own switch in that case?

And do you mean all the ground wires should connect together not touching the switches?
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Old 20th September 2005, 08:47 AM   #8
Splash is offline Splash  United Kingdom
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Ok, im off to maplins this afternoon to pick up the parts, heres what im going to get, please correct me if I'm missing anything or bits are wrong...

Switches x 2

knobs x 2

Enclosure x 1

3.5mm Jacks x 9

Phono connectors x 2
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Old 21st September 2005, 11:51 AM   #9
rabbitz is offline rabbitz  Australia
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Quote:
Originally posted by Splash


Hmm, Not really sure what you mean. should the RCA have their own switch in that case?

And do you mean all the ground wires should connect together not touching the switches?
What I mean is that you only connect the centre pin of the RCA to the switch.... same as the 3.5mm.

Ground wires by pass the switch all together and all connect to 1 point.
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Old 23rd September 2005, 01:30 PM   #10
Splash is offline Splash  United Kingdom
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Ah ok, Think im with you now made another quick diagram just to make sure....

This right?
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