ElJerid said:
I purchased a Samsung 2333HD and encounter a strange audio problem. Because
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.
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
http://www.tigerdirect.com/applicat...CODE=WEBINK&cm_mmc_o=mH4CjCQztBB! mmVCjCECjCE
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
