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Date: Fri, 29 Jun 2012 17:05:08 +0930
From: Mark Jessop <lenniethelemm...@gmail.com>
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To: hackerspace-adelaide@googlegroups.com
Subject: Re: [HACK-ADL] A simple Audio Mixer
References: <4FED178D.2050...@gmail.com> <CAH5StRRcN3hq+KRTOqVbUHD7_OfiHToWqbHDpZ6Tr3=WXLL...@mail.gmail.com> <4FED38F8.9080...@gmail.com> <CAGv+XpQ+kQkjP4v+Spk4jx40aU+_XimFnpwuj-3neASro9f...@mail.gmail.com> <CAAY3yb0hVPUogvS_sWsNS8mAKs32Bxi_Tgrv_VfsQWKhy5p...@mail.gmail.com> <CAGv+XpQwUx+dTeZ+8stNn-efHdiAKB_Cr1OT1YMxiPQhT-M...@mail.gmail.com> <CAGv+XpQSYbw8uMFgFKcHXyFdCjqz5XrTYGmxpbuQt-Q8Kmn...@mail.gmail.com>
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They're going to be used in Amateur radios, which have 300Hz - 3KHz
voice filters anyway, as is the standard for most commercial radio
equipment.
- Mark
On 29/06/12 4:54 PM, Ken wrote:
> If they are this beast: http://www.jaycar.com.au/productView.asp?ID=MM2534
> then the frequency response in the attached brief PDF is given as
> 300Hz-3kHz +- 2.5dB.
> So don't expect too much bass or treble, Kim.
>
> Whereas something like this:
> http://www.altronics.com.au/index.asp?area=item&id=M0707 will give a
> better result (at greater expense).
>
> Ken.
>
>
> On 29 June 2012 16:01, Ken <k...@waggies.net <mailto:k...@waggies.net>>
> wrote:
>
> Do they give a frequency response for them, Kim?
> You'd normally need to pay around $30 for decent bandwidth
> transformers, especially ones intended for microphone use
> (balanced to unbalanced).
> In the past I've used miniature 600/600ohm transformers for
> running earphones off a car radio outputs where the earths weren't
> grounded, but push-pull.
>
> Ken.
>
>
>
> On 29 June 2012 15:54, Kim Hawtin <kimhaw...@gmail.com
> <mailto:kimhaw...@gmail.com>> wrote:
>
> On Fri, Jun 29, 2012 at 3:37 PM, Ken <k...@waggies.net
> <mailto:k...@waggies.net>> wrote:
> > However you may strike ground loop problems if some of the
> device' s
> > chargers are not isolated from mains well enough. (They
> should be.)
> > You'll hear this as 50Hz (or 100Hz) hum.
> > If you don't hear it, all is well.
> > To be cautious about it, use a multimeter to see if there is
> any resistance
> > between the respective grounds of the phone, computer and
> amp while they are
> > off, but plugged in to the mains. Power supplies for each
> should be
> > double-insulated, ie not connected to ground. That said,
> what else is
> > connected to the computer?
>
> this is why i went to jaycar today and purchased all the 3k:3k
> isolation audio transformers they had.
> got something similar in mind for isolating the outputs of
> some radios
> to the input on the sound card of the puter...
>
> cheers,
>
> kim
> --
> "Art without engineering is dreaming; engineering without art is
> calculating." --SKR
>
> --
> You received this message because you are subscribed to the
> Google Groups "HackerSpace - Adelaide, South Australia" group.
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> <mailto:hackerspace-adelaide@googlegroups.com>.
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>
>
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<div class="moz-cite-prefix">They're going to be used in Amateur
radios, which have 300Hz - 3KHz voice filters anyway, as is the
standard for most commercial radio equipment.<br>
<br>
- Mark<br>
<br>
On 29/06/12 4:54 PM, Ken wrote:<br>
</div>
<blockquote
cite="mid:CAGv+XpQSYbw8uMFgFKcHXyFdCjqz5XrTYGmxpbuQt-Q8Kmn...@mail.gmail.com"
type="cite">If they are this beast: <a moz-do-not-send="true"
href="http://www.jaycar.com.au/productView.asp?ID=MM2534">http://www.jaycar.com.au/productView.asp?ID=MM2534</a><br>
then the frequency response in the attached brief PDF is given as
300Hz-3kHz +- 2.5dB.<br>
So don't expect too much bass or treble, Kim.<br>
<br>
Whereas something like this: <a moz-do-not-send="true"
href="http://www.altronics.com.au/index.asp?area=item&id=M0707">http://www.altronics.com.au/index.asp?area=item&id=M0707</a>
will give a better result (at greater expense).<br>
<br>
Ken.<br>
<br>
<br>
<div class="gmail_quote">On 29 June 2012 16:01, Ken <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:k...@waggies.net" target="_blank">k...@waggies.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
Do they give a frequency response for them, Kim?<br>
You'd normally need to pay around $30 for decent bandwidth
transformers, especially ones intended for microphone use
(balanced to unbalanced).<br>
In the past I've used miniature 600/600ohm transformers for
running earphones off a car radio outputs where the earths
weren't grounded, but push-pull.<span class="HOEnZb"><font
color="#888888"><br>
<br>
Ken.</font></span>
<div class="HOEnZb">
<div class="h5"><br>
<br>
<br>
<div class="gmail_quote">On 29 June 2012 15:54, Kim Hawtin
<span dir="ltr"><<a moz-do-not-send="true"
href="mailto:kimhaw...@gmail.com" target="_blank">kimhaw...@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>On Fri, Jun 29, 2012 at 3:37 PM, Ken <<a
moz-do-not-send="true"
href="mailto:k...@waggies.net" target="_blank">k...@waggies.net</a>>
wrote:<br>
> However you may strike ground loop problems if
some of the device' s<br>
> chargers are not isolated from mains well
enough. (They should be.)<br>
> You'll hear this as 50Hz (or 100Hz) hum.<br>
> If you don't hear it, all is well.<br>
> To be cautious about it, use a multimeter to
see if there is any resistance<br>
> between the respective grounds of the phone,
computer and amp while they are<br>
> off, but plugged in to the mains. Power
supplies for each should be<br>
> double-insulated, ie not connected to ground.
That said, what else is<br>
> connected to the computer?<br>
<br>
</div>
this is why i went to jaycar today and purchased all
the 3k:3k<br>
isolation audio transformers they had.<br>
got something similar in mind for isolating the
outputs of some radios<br>
to the input on the sound card of the puter...<br>
<br>
cheers,<br>
<br>
kim<br>
<span><font color="#888888">--<br>
"Art without engineering is dreaming; engineering
without art is<br>
calculating." --SKR<br>
</font></span>
<div>
<div><br>
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<br>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</blockquote>
</div>
<br>
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