How to boost line level?

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Jerkku

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Joined 2015
#1
My Yamaha receiver zone2 line out is wired to other room radio line in with quite long rca-cable.

The line out signal is depressing during the long wire, and i´d
like to boost it from the start so it is suitable level in the other room.

Any ideas how to boost line level signal with a some simple DIY amp?
Not sure what kind on amplifier type would do that.


J
 
#4
Even 100ft of "RCA" cable should suffer no real loss when terminated by a typical input stage.

Do you mean amplitude loss ? i.e. its gone quieter ? If so then it sounds like whatever you are connecting it to is causing excess loading on the Yamaha line outputs.
 
#5
Hi, I ( think I ) saw some kind of TDA 2003 ( single supply ) or TDA 2030 ( dual supply ) at the output of some mixers many years ago. Those are power amplifiers but the Op-Amp topology suggests that you can lower the gain...and they can drive very long cables.
🙄
 
#6
I would like to use amplifier trigger out port to power the line level booster (no usb-ports). Trigger out pover is constant and limited to 12v/0.1A max.

Any idea is that enough for any booster, any suitable schema/ebay DIY item?

J
 
#7
If it's an audiophile trigger out port, it's ok 😛
Just to say, the first thing that goes with the "signal" is the PSU.
So it should be "clean", meaning stable and filtered.
Line level means a signal amplitude from 0.15 to 2 V. This can be obtained by 3 V supply - look at the old walkman or portable cdp.
Using a dual supply, you can eliminate a capacitor in series with the signal - if the offset is kept under the 10^-3 V magnitude 😕
 
#9
It could, it depends on exactly how much quality you are striving for.

But since this is DIY,

A simple TL082 opamp has far better spec's than that and much cheaper!!!

http://www.ti.com/lit/ds/symlink/tl082-n.pdf

No need for it to drive such a low impedance if it is to be only line level, worst case for line level would be >600 ohms.

Here is an example,

Asymmetric Pre-amplifier Circuit - Amplifier_Circuit - Circuit Diagram - SeekIC.com

If you must have that much more current drive then you can add a couple of small signal transistors to the output as in this example,

100mW Stereo Amplifier Circuit based TL082 - Amplifier Circuit

I have built a power amp using this method that rivals small chipamps!!
That circuit is here,

http://www.diyaudio.com/forums/chip...own-supply-what-could-happen.html#post3695968

If you choose to not use discrete components for the output stage, adding a LME49600 is a very good choice.

http://www.ti.com/lit/ds/symlink/lme49600.pdf

http://www.diyaudio.com/forums/parts/162104-compound-opamp-w-lme49600.html#post2098850



or you can use a high current opamp such as a LT1210.
This one has a gain of 1,

http://www.diyaudio.com/forums/soft...re-capacitor-impedance-graph.html#post3848338


A NE5532 may even be a better choice than the TL082 for a opamp line buffer as well either can be had for about $.50 or less.

http://www.ti.com/lit/ds/symlink/ne5532.pdf

More can be found here,

https://www.google.com/search?q=opa...IfwJ8P9yQSjqoE4&ved=0CC4QsAQ&biw=1280&bih=828

http://electronicdesign.com/analog/op-amp-audio-realizing-high-performance-buffers-part-i

FWIW

jer 🙂
 
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