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Old 26th January 2005, 10:48 AM   #1
obx is offline obx  United States
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Default DIY Audio source passive attenuator

I got a spectrum audio analizer/equalizer.

This is hooked up to a Harmon Kardon tuner
and amplifer.

One thing I noticed is that the spectrum display
is maxed out. This is ok when using the tuner TU910
which has a variable output. I can dial in the
line level voltage down some and it sounds much
better.

My humble question is can I build a external line
passive line level attenuator to place inline
after the source signal and before the spectrum
equalizer?

In looking at the impedence specs of the integrated
amp it sayd .8v/22k ohms. Whn I looked at the pot
on the tuner the numbers appear as

50271151
5kbx2

I would like to use a dual level audio pot but
am wondering what ohm rating I should use.

Im a little confused that a 5k pot can attenuate
a 22k ohm impedance for the amp.

Any ideas or DIY projects to acomplish this task
would be appreciated.

thanks

marc
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Old 27th January 2005, 01:34 PM   #2
rabbitz is offline rabbitz  Australia
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An inline attenuator might be the go if you don't want to use pots. Have a look at this post.

http://www.diyaudio.com/forums/showt...614#post547614
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Old 28th January 2005, 05:05 AM   #3
obx is offline obx  United States
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thanks for your reply.

I'd really like to go the variable way because
I have multiple inputs. What I'd like to do is
mod the equalizer input and make it variable
similiar to the way my harmon kardon tuner's
output is.

I could then dial in the input voltage using
the spectrum display avoiding clipping in the
eq.

Some of the Yamaha Eq's have this ability built
in. I guess they saw the need to regulate the input
voltage there.

Anyways this is what mod I would like to do.

I really don't have an idea of what impedence
value I should use for the dual pots.

I could really use some advice in choosing the
right pot for the mod.

thanks

marc
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Old 28th January 2005, 09:39 AM   #4
rabbitz is offline rabbitz  Australia
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I did build a variable one using 2 single gang 10K linear pots.

Was set up in a little jiffy box and had input leads which I found were a menance so I changed the inputs to RCA's fitted to the box and in the process the drill hit a pot pin, destroying it...... grrrrrrr. Instead of running out and buying another pot I ended up making up the inline attenuator with resistors using stuff I already had.

It should have worked quite well.
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