<nimbiotics@[EMAIL PROTECTED]
> wrote in message
news:1173652616.625080.323530@[EMAIL PROTECTED]
> First I want to apologize for my poor english. I'm not english
> speaker.
>
> For space sake, I will describe my situation giving only details I
> think are strictly necessary. If you need any more details please
> don't hesitate to ask.
>
> I've got an amplified signal from a 40watts stereo amplifier. I need
> to feed this to a device that will only receive preamplified signal.
> I can control the output of this amplifier with high accuracy in up to
> +65500 increments so I was thinking about using this feature. The only
> issue was to determine my top value.
> I was told by a friend that I should use a 1:1 audio transformer and
> start testing for saturation (basically by monitoring the output, no
> hitech involved here, dont have the knowledge)
>
> I searched the net for the audio transformer and I am now more
> confused than when I started. I wouldn't even know how to hook up the
> transformer so I will definetly need help on that to. Do I have to use
> one transformer per channel? How am i suposed to wire it? How am I to
> know what my max volume level should be on my amplifier?
>
> Any and all comments will be highly appreciated.
>
> Muchas Gracias in advanced
> Mario Osorio
>
Quote: "I've got an amplified signal from a 40watts stereo amplifier. I
need
to feed this to a device that will only receive preamplified signal."
It is not considered good electronic practise to connect a power amplifier
(your 40 watt amp) to a pre-amp for a number of reasons. However there
are
situations when this is the only possibility.
So the way to do it is to isolate the power amp from the pre-amp or
transform a power device from an electrical device (per-amp)
The way to do this is either with a step down transformer or more simply
with a resistive network or attenuator. Probably a 20db pad would do - if
this email survives formatting it would look like this
amp output xxxxxxxxx-xxxxxxxxx to pre-amp input
x
x
x
x
Where the network looks like a T with a resistor either side of the
junction
and the base of the vertical connected to earth.
Look up on google " 20db pad from speaker output to line in"
http://www.whirlwindusa.com/dirbox.html
