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Old 17th January 2009, 07:10 AM   #1
Bgt is offline Bgt  Netherlands
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Default Where to find RF remote stepped attenuator?

anyone?
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Bert
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Old 18th January 2009, 04:06 PM   #2
w1jim is offline w1jim  United States
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Default Build it yourself...

You could try building one yourself. The one I built isn't stepped but you could make one that is. (Note - the server hosting the picture is apparently down at the time of posting).

Click the image to open in full size.

http://www.audiokarma.org/forums/sho...ighlight=w1jim

JimB
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Old 26th January 2009, 02:31 PM   #3
bambo is offline bambo  Netherlands
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Hi Bert,

how about van Eijndhoven's High Quality relay switched (63 steps of 1 dB) attenuator AND source selector? It uses a relatively modest number of 24 resistors for the attenuation (thinking stereo), so you can opt for extra-quality resistors without breaking the bank. As a possible plus, you could call the maker in your mother tongue, as he is a dutchman as well.

http://www.vaneijndhoven.net/jos/switchr/design.html

I have been thinking about this attenuator, but am not yet ready to take the plunge ;-) Sure seems like a very nice offer to me though!!

regards,
Mark
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Old 26th January 2009, 04:10 PM   #4
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I wonder how loud the relays are, and if they are mechanically audible, or audible through your system as well?

-justin
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Old 3rd February 2009, 03:51 PM   #5
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Quote:
Originally posted by despotic931
I wonder how loud the relays are, and if they are mechanically audible, or audible through your system as well?

-justin
On my breadboard preamp they click quite loudly
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Old 4th February 2009, 03:48 AM   #6
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Quote:
Originally posted by Miniwatt


On my breadboard preamp they click quite loudly

through your speakers or just audibly in the room? (is it a mechanical noise or an electrical noise?)
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Old 4th February 2009, 05:40 AM   #7
es44 is offline es44  Denmark
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I think you guys are thinking of a different thing.

What Bert i talking about, is a RF (radio frequency) attenuator, and a LF (low frequency) att. wouldn't be useful here.

Sorry, i don't hav a clue myself how to make one

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Ebbe
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Old 4th February 2009, 08:59 PM   #8
bambo is offline bambo  Netherlands
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Default Attenuate RF or RF control of an attenuator?

Hi analogue lovers,

excuse me if I got it all wrong, but I assumed Bert's question was about a remote controlled stepped attenuator. And, true, IR is not exactly RF. But it will approximate it, I thought.

I don't really think his question was about attenuating RF (or LF for that matter). On the other hand, Bert's silence doesn't help me feeling all to certain about my 'great' assumptions...

Either way, I guess if decent quality relays are used for switching, you can hear some small klicking noise. Especially if the breadboard is out in the open
Electrically it should be very clean, though... Perhaps the klicking could be lessened using Reed relays?

Enjoy your favourite albums!
Mark
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Old 13th February 2009, 12:53 AM   #9
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Turns out to be off-topic, but to answer your question:

Quote:
Originally posted by despotic931



through your speakers or just audibly in the room? (is it a mechanical noise or an electrical noise?)
Mechanical.
Before I tied the grounds together there also was a clicking sound coming through the speakers -but only on the 32 'loudest' steps.
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