Apologies in advance to Group for this dumb newbie question.
I know basic electronics but not audio.

I have bought a standard DVD player. The S-video output is connected
to an overhead projector. But as for the sound . . .
It has two standard stereo output phono sockets - red and white.
My question:
Can I connect these directly to speakers or do I need some form of
amplifier?

If I need an amplifier, I have an old B&O Beocentre 5000 (great in its
day!!)
It has an AUX (din type) input(?) on the front (beside the MIC input)
Likely I could connect the DVD sound to this and use the B&O system
for my DVD sound output?

In hope

Mikey

On Wed, 27 Aug 2003 22:50:39 +0100, "Mikey"
wrote:

Apologies in advance to Group for this dumb newbie question.
I know basic electronics but not audio.

I have bought a standard DVD player. The S-video output is connected
to an overhead projector. But as for the sound . . .
It has two standard stereo output phono sockets - red and white.
My question:
Can I connect these directly to speakers or do I need some form of
amplifier?

You need an amplifier but you can buy speakers with amps in them. For
example, most computer speakers are self-amped although they generally
do not sound great.

If I need an amplifier, I have an old B&O Beocentre 5000 (great in its
day!!)
It has an AUX (din type) input(?) on the front (beside the MIC input)
Likely I could connect the DVD sound to this and use the B&O system
for my DVD sound output?

Sure. All you have to find is the right adapter to plug these into
the AUX (DIN) input.

Kal

I post a question and it takes nearly half an hour to get three great
answers :-))))

I can't believe I have the replies already !!!

Take a bow - Kalman, Jim and Laurence. Many thanks to each of you.

I really appreciate your speedy replies. My problem is solved.

We could have been lying :-)

On Thu, 28 Aug 2003 00:26:13 +0100, Laurence Payne
wrote:

I post a question and it takes nearly half an hour to get three great
answers :-))))

I can't believe I have the replies already !!!

Take a bow - Kalman, Jim and Laurence. Many thanks to each of you.

I really appreciate your speedy replies. My problem is solved.

We could have been lying :-)

Well, he'll realize the result of our conspiracy soon. ;-)

Kal

"Mikey" wrote in message ...
Apologies in advance to Group for this dumb newbie question.
I know basic electronics but not audio.

How much basic electronics do you know?


I have bought a standard DVD player. The S-video output is connected
to an overhead projector. But as for the sound . . .
It has two standard stereo output phono sockets - red and white.
My question:
Can I connect these directly to speakers or do I need some form of
amplifier?

Your DVD player probably puts out 1 or 2 volts with a source impedance of
a hundred ohms or so. It is intended to feed an input impedance of perhaps
10kohms or more.


Plug in some 8 ohm speakers - you'll get a peak of 60dB or so close up.
Use a couple of 100v line transformers - you might be able to get another 10dB
but what you really need is an amplifier :-)

If I need an amplifier, I have an old B&O Beocentre 5000 (great in its
day!!)
It has an AUX (din type) input(?) on the front (beside the MIC input)
Likely I could connect the DVD sound to this and use the B&O system
for my DVD sound output?

Such as that one!


You will probably overload the B&O input - you might need 10 or 20dB
of attenuation.

The DVD player probably has some options for the audio output mode.
Set it to mixdown to stereo for best results rather than pseudo Dolby-surround.



Roger.

ps. How long before you succumb to temptation and buy a 5.1 amp/speaker set?

"The Old Fogey" wrote in message
om...
"Mikey" wrote in message
...
Apologies in advance to Group for this dumb newbie question.
I know basic electronics but not audio.

How much basic electronics do you know?


Ohm's Law and a few derivatives thereof. Attenuation - hhhmmmmm
Lots of soldering and kit building.
House wiring !!


I have bought a standard DVD player. The S-video output is connected
to an overhead projector. But as for the sound . . .
It has two standard stereo output phono sockets - red and white.
My question:
Can I connect these directly to speakers or do I need some form of
amplifier?

Your DVD player probably puts out 1 or 2 volts with a source impedance of
a hundred ohms or so. It is intended to feed an input impedance of perhaps
10kohms or more.


Plug in some 8 ohm speakers - you'll get a peak of 60dB or so close up.
Use a couple of 100v line transformers - you might be able to get another
10dB
but what you really need is an amplifier :-)


Agreed

If I need an amplifier, I have an old B&O Beocentre 5000 (great in its
day!!)
It has an AUX (din type) input(?) on the front (beside the MIC input)
Likely I could connect the DVD sound to this and use the B&O system
for my DVD sound output?

Such as that one!


You will probably overload the B&O input - you might need 10 or 20dB
of attenuation.


How do I do that? PLEASE

The DVD player probably has some options for the audio output mode.
Set it to mixdown to stereo for best results rather than pseudo
Dolby-surround.


Yes, saw them OK and set it for stereo as you suggest



Roger.

ps. How long before you succumb to temptation and buy a 5.1 amp/speaker
set?

Soon. Very soon. Just hate all that wiring :-))

Thank you for your comments.

Mikey

In message , Mikey
writes

You will probably overload the B&O input - you might need 10 or 20dB
of attenuation.




The original DIN specifications defined inputs to amplifiers to be
current-fed. (I have no idea why they did this). This means that if you
connect a standard output to such an input you will overdrive the input.
You need a series resistor in the signal line (try 100k Ohms)

On the other hand, a lot of UK manufacturers used DIN plug connections
but had ordinary 200mV (or thereabout) input sensitivities with an input
impedance of 50k Ohms or so. In which case a phono-to-DIN (or whatever
your output connector is) will be perfectly OK.

--
Chris Morriss

Mikey wrote:


If I need an amplifier, I have an old B&O Beocentre 5000 (great in its
day!!)
It has an AUX (din type) input(?) on the front (beside the MIC input)
Likely I could connect the DVD sound to this and use the B&O system
for my DVD sound output?

Such as that one!


You will probably overload the B&O input - you might need 10 or 20dB
of attenuation.



How do I do that? PLEASE


IN----===R1===----+--OUT
|
|
R2
|
|
GND-----------------+--GND


Vout = Vin * R2 / (R1 + R2)

If the DVD audio is very much louder than the radio or phono,
attenuate the input. 22k for R1 and 2.2k for R2 would be about right
for a 2v DVD output and a 200mv input.

Or you could spend £113 with Russ Andrews. :-)

Roger.

Many thanks again to everyone who contributed.

Mikey


"Old Fart at Play" wrote in message
...
Mikey wrote:


If I need an amplifier, I have an old B&O Beocentre 5000 (great in its
day!!)
It has an AUX (din type) input(?) on the front (beside the MIC input)
Likely I could connect the DVD sound to this and use the B&O system
for my DVD sound output?

Such as that one!


You will probably overload the B&O input - you might need 10 or 20dB
of attenuation.



How do I do that? PLEASE


IN----===R1===----+--OUT
|
|
R2
|
|
GND-----------------+--GND


Vout = Vin * R2 / (R1 + R2)

If the DVD audio is very much louder than the radio or phono,
attenuate the input. 22k for R1 and 2.2k for R2 would be about right
for a 2v DVD output and a 200mv input.

Or you could spend £113 with Russ Andrews. :-)

Roger.