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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

+4dBu  to  -10dBV line attenuation?
+4dBu  to  -10dBV line attenuation?
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Old 17th November 2017, 09:51 PM   #1
Cableaddict is offline Cableaddict
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Default +4dBu to -10dBV line attenuation?

I need to make a simple U-Pad, to convert a 600 ohm balanced signal from +4dBu to -10dBV

I can't for the life of me figure out the calculation.

Can someone help a brother out?


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Old 17th November 2017, 09:58 PM   #2
CharlieLaub is offline CharlieLaub  United States
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Helpful web page for you:
Convert between dBu dBV and RMS Volts
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Old 17th November 2017, 11:18 PM   #3
Cableaddict is offline Cableaddict
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Thanks, Charlie.

Good info there. However I already knew that I need 11.78 db attenuation. I should have included that in my first post.

What I need is the correct resistor values, again for a simple balanced 600 ohm line.

Last edited by Cableaddict; 17th November 2017 at 11:33 PM.
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Old 17th November 2017, 11:37 PM   #4
rayma is online now rayma  United States
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Quote:
Originally Posted by Cableaddict View Post
I need 11.78 db attenuation.
T-Pad / H-Pad Calculator - Resistor Values for Attenuation
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Old 17th November 2017, 11:39 PM   #5
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Thanks Rayma, but I'm not making a T or H pad.
I don't need to convert impedance and I need to do this inside an XLR plug.

Again, I want to make a U-Pad. There may be a way to interpolate from the H-Pad numbers, but I don't know how.
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Old 17th November 2017, 11:43 PM   #6
rayma is online now rayma  United States
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Quote:
Originally Posted by Cableaddict View Post
Again, I want to make a U-Pad.
http://3.bp.blogspot.com/-NH_cxciYfh...attenuator.png
Uneeda Audio - Build your own attenuator pads

Last edited by rayma; 17th November 2017 at 11:57 PM.
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Old 18th November 2017, 12:36 AM   #7
rayma is online now rayma  United States
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Similar to an L pad calculation, but split the input resistor into two equal parts,
each half the value calculated.

Last edited by rayma; 18th November 2017 at 12:38 AM.
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Old 18th November 2017, 01:34 AM   #8
PRR is offline PRR  United States
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12dB is 4:1. This is approximately a voltage divider made with two resistors of 3:1 ratio. (1.5+1.5:1 for balanced.) You can do it on a very large matchbook.
Attached Images
File Type: gif 12dB-Pad.gif (27.8 KB, 180 views)

Last edited by PRR; 18th November 2017 at 01:40 AM.
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Old 18th November 2017, 07:27 AM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Cableaddict View Post
I need to make a simple U-Pad, to convert a 600 ohm balanced signal from +4dBu to -10dBV

I can't for the life of me figure out the calculation.

Can someone help a brother out?


- THANKS.
Quote:
Originally Posted by CharlieLaub View Post
Helpful web page for you:
Convert between dBu dBV and RMS Volts
A Jensen app note has the resistor network for this conversion.
I don't remember which one. There are over a dozen, so it will take some searching.
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Last edited by AndrewT; 18th November 2017 at 07:31 AM.
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Old 19th November 2017, 12:42 AM   #10
Cableaddict is offline Cableaddict
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SO.....


No one can just calculate the values?


I'm totally stuck here.
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