Sound problem
ElJerid
the internal speakers are of low quality, I also purchased a set of Hercules
2.1 external speakers which I connect to the earphone output jack of the
display. In the menu, I select the output speakers, but no sound comes out.
I tested the speakers on anothher source (audio out from a video camera) and
they work fine. However, if I connect a pair of earphones on the monitor,
they also work fine. Why can't I get sound from the monitor to the speakers
? Is it because an impedance misfit ? How can I solve the problem ?
Thanks for any help.
peter
peter
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"ElJerid" <s.vanderhae...@telenet.be> wrote in message
news:1YE_m.17349$jY5....@newsfe22.ams2...
Paul
That monitor is like the Space Shuttle :-) Most adverts for it,
don't do it justice in describing the feature set. Even the
Samsung user manual, leaves a lot to be desired, but at least
all the ports are pictured.
http://downloadcenter.samsung.com/content/UM/200810/20081014104651656/BN59-00785B-01Eng.pdf
Anyway, I like your theory about an impedance issue.
The unit has 2 x 3W speakers inside. It would be relatively simple,
to have the earphone jack on the side of the unit, cut off the speakers,
and feed the amplifier output to the earphone port. Earphones might be
32 ohms. Perhaps to protect the tiny power amp inside the unit, they
disable the amp if no load is detected.
If you're not good with a soldering iron, you can try the following
as a test case. Buy a "Y" cable at Radio Shack. Plug the headphones that
work into one jack. Plug the Hercules amplified speakers into the other
jack. See if the Hercules provide output. The idea, is to use the
impedance of the headphones, to trick the thing into working.
http://www.radioshack.com/product/index.jsp?productId=2103870
If it works that way, then obviously you're not going to like the
tinny noise coming from the headphones all the time. You'd need to
make up a custom audio cable, with a load resistor on each channel.
For example, you could place a resistance of 33 ohms on each channel.
That would provide the load that the analog power amp is looking for
inside the monitor.
Tip ----+----------------Tip (Left)
|
33 ohm
|
Sleeve --+----------------Sleeve (Ground)
|
33 ohm
|
Ring ----+----------------Ring (Right)
(Male (Female
plug) jack)
A source of a male plug, with three terminals inside the plastic sleeve.
http://www.radioshack.com/product/index.jsp?productId=2104062
A female jack, which should also have three terminals inside.
http://www.radioshack.com/product/index.jsp?productId=2062461
33 ohm half watt resistors
http://www.radioshack.com/product/index.jsp?productId=2062312
Wire. I buy wire from anywhere except Radio Shack. Use your
best judgment. You need wire of a small enough gauge, to fit
through the holes in the plug and jack terminals. Maybe 24 gauge
would be good enough.
The power the headphones would normally receive, would be
on the order of 1 volt across 32 ohms, (V*V)/R = (1*1)/32 = 31mW.
The half watt resistor should be able to handle this. (The Samsung
manual is totally bereft of anything smacking of specs.)
Working backwards, 0.5W = V**2 over R, the resistor could take
about 4 volts across it, so the monitor shouldn't be able to
burn the resistors. They wouldn't put four volts out on the
headphone jack.
You'll need a soldering iron, or some very careful wire twisting
and electrical tape usage (ugh). You can make up an adapter
to present a load and allow the external amplified speakers to
work.
I think your plan is a good one, and will allow you to enjoy all
the derived audio sources the monitor is capable of extracting.
Whether it is the analog TV inside the monitor, extracting audio
from HDMI, accepting audio from the AV/component area of the unit
and so on. The mixer inside the monitor, should be multiplexing
all those sources before driving the earphone jack on the side of the
monitor.
Paul
peter
He has a Sound problem
Disconnecting the monitor from the sound source and plugging the
speakers into the sound card directly gives him sound
If he using the unit for TV with a Cable/satelite box he did not mention it.
If he is using the unit for TV using a TV card on the computer he will still
have sound.
peter
--
If you find a posting or message from me offensive,inappropriate
or disruptive,please ignore it.
If you dont know how to ignore a posting complain
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>
>>Connect the speakers directly to the audio output on your computer
>>
>>peter
>>
>>--
>>>
>
> Clever suggestion Peter, that will really solve the display output
> problem :-)
>
> OP can also start watching tv, can't he/she :-)))
kony
I'd consider taking the monitor back for a refund, or an
exchange at the very least... maybe it's just a faulty audio
jack or something and the speaker audio cord's jack is
slightly different than that of the headphones.
ElJerid
Thanks for all the answers.
I could find a solution to the problem, but still can' t understand the
reason... First idea was the speakers jack was defective and I soldered
another new one. The sesult however was the same. No sound if connected to
the monitor audio output, and sound ok if connected to the PC audio output.
Because this looked crazy, I tried a crazy solution... I found in my
"connectors box" a lot of adaptors and did the following connection: from
female monitor audio output to mini jack / female (big) microphone adaptor,
from female (big) microphone to microphone male / female mini jack adaptor,
and from the last one to the speakers (male) connector. And guess what, it
worked ! So, just by putting 2 adaptors between monitor and speakers, the
problem is solved !!!
The only explanation I see is a very small difference at the jacks that are
plugged into the monitor audio output. Sizes and diameter are exactly the
same, but at the base of the (working) jack, there is a thin metal ring that
is not present on the other one.
Never heard that there were 2 incompatible "standards" for those mini
jacks...
Paul
Three are 2.5mm and 3.5mm audio plugs. But I would have expected computer
speakers to have a 3.5mm stereo plug on the end. If the amplified speakers
had a 2.5mm plug on the end, they may have been intended for "music player"
applications of some sort. (I wouldn't have known about the 2.5mm ones,
except I saw some on the rack at Radio Shack a couple days ago. And thought
at the time, "what a stupid idea" to introduce yet another size.)
http://img.cytaninternational.com/ebay/img/dsdshop1_pimg/U81.jpg
There are also some crack addicts, who have invented things like this.
I think Creative used this idea, on some of their products. And Apple
used a longer-than-normal plug on their microphones, just to make
them incompatible with everything. (I have an Apple microphone, that
I've never managed to get any sound into.) So there are a few variations
on the 3.5mm stereo plug, to confuse matters.
http://www.aftermarketcellular.com/cart/images/pcs/APLIPHONEHFA2.gif
Paul
Paul
Three are 2.5mm and 3.5mm audio plugs. But I would have expected computer