Simple line level amp circuit for auto application?

[Scott MacLean]

I've hack-installed a satellite radio receiver into my car's factory stereo,
however the line level output of the receiver is nowhere near the level
required to drive the receiver happily. The end result is that when
listening to the satellite, the receiver's volume has to be at or near
maximum, which means it is amplifying all the low level noise and crap along
with it.

I'd like to put a simple line level amplifier in there to solve the problem,
obviously running off the car's 12 to 13.8v supply, and being relatively
immune to external noise. Years ago when I did this sort of thing I would
have used a 741 op amp, but I understand there are far better solutions
(sonically) nowadays - a 5532, perhaps?

Anyone have any suggestions as to components and circuits I could use, or
better yet, a proven kit I could put together?

Thanks...

 

[Richard Crowley]

"Scott MacLean" wrote ...

I've hack-installed a satellite radio receiver into my car's factory
stereo,
however the line level output of the receiver is nowhere near the level
required to drive the receiver happily. The end result is that when
listening to the satellite, the receiver's volume has to be at or near
maximum, which means it is amplifying all the low level noise and crap
along
with it.

I'd like to put a simple line level amplifier in there to solve the
problem,
obviously running off the car's 12 to 13.8v supply, and being relatively
immune to external noise. Years ago when I did this sort of thing I would
have used a 741 op amp, but I understand there are far better solutions
(sonically) nowadays - a 5532, perhaps?

Anyone have any suggestions as to components and circuits I could use, or
better yet, a proven kit I could put together?

Something like this would work pretty well...
http://www.mpja.com/productview.asp?product=6017+KT
(This is mono, you will need two for stereo)
But it only costs 4USD

 

[Watson A.Name - "Watt Sun]

In article <Nh8Hb.16186$d%1.3518043@news20.bellglobal.com>,
scottNO@SPAMnerosoft.com mentioned...

I've hack-installed a satellite radio receiver into my car's factory stereo,
however the line level output of the receiver is nowhere near the level
required to drive the receiver happily. The end result is that when
listening to the satellite, the receiver's volume has to be at or near
maximum, which means it is amplifying all the low level noise and crap along
with it.

I'd like to put a simple line level amplifier in there to solve the problem,
obviously running off the car's 12 to 13.8v supply, and being relatively
immune to external noise. Years ago when I did this sort of thing I would
have used a 741 op amp, but I understand there are far better solutions
(sonically) nowadays - a 5532, perhaps?

Anyone have any suggestions as to components and circuits I could use, or
better yet, a proven kit I could put together?

Have you checked to see if it might be a loading problem? In other
words, are you trying to drive a low impedance input with a high
impedance output? If so, your amp may not help at all if it is also a
high Z output. And all you might need is something to match the
impedance. A pair of transistors in an emitter follower circuit might
do just what you need, yet they could be put in the existing circuit.
Another thought is that a simple matching transformer might also work.

Thanks...

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