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Old 25th December 2004, 03:01 PM   #1
Semir is offline Semir  Hungary
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Default Input Selector

Hi everyone!

I'd want to use an electrical input selector for my amp (as I want to make it controllable by rf). What kind of solution would fit the best? (Triac, ic, whatever)
Please help if you could!

Looking forward!
Thanks!
Yours, Semir
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Old 25th December 2004, 03:16 PM   #2
sam9 is offline sam9  United States
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reed relay. Triacs are noisy. Use active devices to control the relay but don't pass the signal through the devices.
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Old 25th December 2004, 03:44 PM   #3
Semir is offline Semir  Hungary
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Hi there!

And something like that can be used to protect speakers when turning on/off (and when changing inputs if succeeds ?

If anyone had circuits, please send or the url!

Thanks a lot!

Yours, Semir
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Old 25th December 2004, 04:01 PM   #4
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I'm currently working on a input selector using relays and a microcontroller. I'l be sharing my work when it's done.

merry xmas and a happy new year everybody!

regards
marius
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Old 27th December 2004, 10:35 PM   #5
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Default Re: Input Selector

Quote:
Originally posted by Semir
I'd want to use an electrical input selector for my amp (as I want to make it controllable by rf). What kind of solution would fit the best?
Hi Semir,

LGreen used a relay switching input selector in his Pass Labs BOSOZ preamplifier that he has pictures posted in this thread

He has a website with extensive details of his building process and you might want to ask him to share his input selector design in order to save you unnecessary effort.

Worth checking out, at least. Hope this helps.
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Old 27th December 2004, 10:50 PM   #6
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Actually, I just noticed that LGreen supplies the input relay boards and power supply PCB artwork on his website. Just got to the bottom of the page linked in my previous post.

He also includes the diode matrix board which controls the relay boards.
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Old 28th December 2004, 04:50 AM   #7
Semir is offline Semir  Hungary
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Thanks a lot!

That will help I believe, with all the other links.
But let me as a silly question! For the first glance, I wanted to build a power amp with some additional circuit. But anywhere I roam on this fourm and other sites, I found that everyone makes a seperated pre-amp. Which is good, I believe, but did not think that I need that. But now, I changed my mind (with this and a dosen of things ) and feeling that itd be worth to make a seperated pre-amp. But most power amp circuit has their own pre-amp circuits, which only a pre-amplifies the signal for the power amping, but does nothing else with it. Are these power amp circuits good after a pre-amp? I mean I dont know how big signal comes out from a pre amp. Is not it too large with the pow amps preamplifying together?

Thx, and sorry for that basical quest)

Bye, Semir
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Old 28th December 2004, 06:18 AM   #8
sam9 is offline sam9  United States
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I think the main reason is that putting both a power amp and preamp in the same enclosure adds a lot of problems with layout and shielding. You will be putting a lot of line level signal wiring close to amplified signals. This creates potential problems with cross talk, oscilation PS noise, etc

It can certainly be done, but it is just less troublesome to use separate enclosures.
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