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Old 16th February 2011, 08:58 AM   #1
MiiB is offline MiiB  Denmark
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Default Input selector...??

I have yet to find a way to switch.. amplifier inputs without terribly degrading the sound..
Seems like the manual rotary switch sounds better than any relay i have tried...but is no so piratical to get working with a remote...does seem like mechanics in the signal path is not too beneficial...

I have then thought about using a jets as a switch and place the amplifier input impedance outside the Jfet switch..

any takers on the pros and cons of this arrangement..??

will there be any thumbs when switching inputs...or can this be solved by slowly rising the switch voltage..??
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Old 16th February 2011, 10:32 AM   #2
GoranB is offline GoranB  Poland
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Hi MiiB,

I had the same problem, anyway i prefer relays (good quality audio relays). I found them when i was working in TV station. (spare parts for mixete designed from Rupert Neve). Im very satisfied.
Anyway, now i have a problem with volume atenuator, i was trying to do some DIY atenuator..still not satisfied.
I would not use any active element for switching inputs, so im not recomending it to you.
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Old 16th February 2011, 11:18 AM   #3
Mooly is offline Mooly  United Kingdom
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FET's are my preferred option and were very succesfully used here,

Post #2
My MOSFET amplifier designed for music.

Post #201
My MOSFET amplifier designed for music.

Remote decoder used, the best I have come across, the guy deserves much credit for the code and implementation.
FPRC5RX - DIY learning IR decoder
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Old 16th February 2011, 11:33 AM   #4
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how about this one?


AMB Laboratories DIY Audio • View forum - ?2 relay-based stereo input/output selector

(one that I helped co-design)
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Old 16th February 2011, 12:40 PM   #5
MiiB is offline MiiB  Denmark
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I really like the idea of jfet switch.. as isolation is good and the switching seems so simple...
have tried to simulate it in Lt-spice.. but cant seem to get it working....hmm

Thanks for the links mooly.....
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Old 16th February 2011, 03:35 PM   #6
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Quote:
Originally Posted by Mooly View Post
]

Remote decoder used, the best I have come across, the guy deserves much credit for the code and implementation.
FPRC5RX - DIY learning IR decoder
our unit (lcduino-1) also has learning IR. and lcd and user settable port names and a gui inside to let you set various things all at runtime with cursors and stuff

the arduino code I use also can recognize and store sony, philips, nec IR codes.

we will be showing it at this weekends headfi event in the bay area. come by if you are local and we can demo it.
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