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Resister Values for DIY L Pad
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GrahamD View Drop Down
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Joined: 13 Feb 2015
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    Posted: 02 Sep 2016 at 6:36am
I'm after a bit of advice as to the recommended resister values for an L pad to attenuate the output of my CD player connected to my amp to bring it more in line with the turntable volume.
The stated line level impedance is 100k ohms ( Yarland Pro 88 valve amp) and I think -10db should do the trick.
Any advice would be appreciated.
Cheers
Graham
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Graham Slee View Drop Down
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Joined: 11 Jan 2008
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Points: 16298 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 02 Sep 2016 at 8:00am
IEC 61968 expects to see a maximum load of 22k ohms which gives us a starting point. -10dB is roughly 1/3rd of the signal and attenuators are calculated as 1/(Rin/Rload) + 1.

You could try 22k/10k or 15k/8k2.
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GrahamD View Drop Down
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Points: 34 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GrahamD Quote  Post ReplyReply Direct Link To This Post Posted: 02 Sep 2016 at 10:21am
Thanks Graham. You are a legend.
22/10 is what I figured as a starting point but needed confirmation before I fired up the soldering iron.
Cheers
Graham
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