New TV and Surround Sound System

Lou (onaquest) said:

John, you found  A  solution, but not  THE  solution.

TomC's problem was that the audio from his TV was fixed amplitude and the AMP did not have a volume control.

You still have the same problem with your proposed solution.  The digital output on all my devices is not volume controllable from the source remote.  Volume is controlled within the receiver/amplifier.  (presumably, once it's converted to analog to be sent to the speakers)

The referenced converter made no mention of having the smarts, to not only convert the digital audio to analog, but to provide a variable output.

Tom's problem and Olive's problem may be slightly different.  The final solution to each problem is going to be interesting.

The beat goes on.......

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Lou (onaquest) said:

Come on  now!

You Winni guys are about to disappoint me.  I thought you guys were a well connected, well informed bunch of guys who knew all there was to know about your brand of RV. 

This is a Winni specific problem, like it or not.  Suck it up and step up.......

The problem is that no one seems to know what the (Winni) pseudo surround sound amplifier looks like, what it's capabilities or limitations are, or where to find it.

All that TomC is asking is;  where in the hell RV is it?   

It's show time.........

   

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TomC said:

John - I found an old doc that I got from Winnie that describes the process for modifying the Sony TV's to work with the DHS system but the file size is approx. 3 MB and the system won't allow me to post it. The message was something to the effect that I needed permission. I truly believe this doc will shed light on the problem or at least add to the equation.
How can I attach this doc which, BTW, includes god pics?

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TomC said:

John - Can't accept your wager because all that impedance stuff went right over my head. Perhaps I'm in over my head.
Seriously, can you give a simple explanation for that.

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Ya'll have been busy in this thread 

I'll try for a simple explanation, but it has been many years since I had electronic theory ..

In alternating current circuits (as in not DC), electrical resistance is expressed as ohms of impedance (abbreviated as 'Z').  For the best circuit efficiency (maximum transfer of power), impedance needs to be closely matched.  In this situation, speakers are usually four or eight ohms, amplifier inputs are somewhere in the range of 1-2k ohms (or could be 10K.)  If you directly connected the speakers to the input of the amp, you would have a serious impedance mismatch, very poor efficiency at way too high of a signal level, perhaps distortion and you would undoubtedly drive the amp way too hard.

Another common example would be a transmitter - for an example a CB radio (among others) has an output impedance of 52 ohms.  If you connect an antenna that is not in resonance (not tuned to the particular frequency of the transmitter), there is a mismatch and transmit power will not all be present at the antenna and some will be 'reflected' back to the radio.  So instead of three or 3.5 watts of power at the antenna, you might have one or two watts (or less or more depending on the mismatch.)

The transformer (matching transformer in this situation) primary winding and secondary winding have a different number of turns - this ratio of turns will determine if the transformer is a step-up, step-down, or if a one-to-one ratio, called an isolation transformer.  To design the transformer we would divide 2,000 by 8 and the result is the ratio we need of primary to secondary windings.

The size of the transformer (wire gauge) is determined by how much current it must handle.  For our matching transformer, the current levels are very small, so the transformer can be physically small.

I know there are a bunch of hams on the forum, so if I made a mess of the explanation, please clarify where necessary.