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Conference hips::uk_audioo

Title:You get surface noise in real life too
Notice:Let's be conformist
Moderator:GOVT02::BARKER
Created:Thu Jul 28 1988
Last Modified:Mon Jun 02 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:550
Total number of notes:3847

346.0. "Video through phono inputs?" by CURRNT::KING (I'm afraid you've got cows Mr Farnsworth) Thu Feb 13 1992 23:39

    
    
    
    Short question really but couldn't find a relevant note...
    
    
    How would I connect a NICAM stereo video up to a stereo system with
    only phono inputs available?  I assume the phono inputs are somehow
    'tuned' to receive the weird levels that record decks kick out, so what
    would I need to do make 'em compatible to the videos output?
    
    Is there a box I could buy (I'm not that good with a soldering iron,
    but am willing to try if necessary!) to make the conversion possible,
    or is it just gonna be too much hassle?!!
    
    
    Chris.
T.RTitleUserPersonal
Name
DateLines
346.1What kind of audio out connector does your VCR have?UPROAR::GUNNSBiodegradable and ozone friendlyFri Feb 14 1992 09:361
346.2there must be more than one inputBAHTAT::SALLITTa legend in his lunchtimeFri Feb 14 1992 13:0810
    re .0...
    
    Doesn't your amp have an input marked "AUX"? If so, this should handle
    a vcr's audio output with no problem. 
    
    "Phono" is a misnomer, and defines the type of socket and plug, rather
    than the signal level that it is used for - unless it is on an input 
    marked "phono", which is the record player input.
    
    Dave
346.3MARVIN::WARWICKTrevor WarwickFri Feb 14 1992 13:556
    
    Your VCR probably has a SCART output. I made myself up a SCART to Phono
    lead for this purpose using bits from Tandy - alternatively, they sell
    ready-made leads, but they were much too short for my application.
    
    Trevor
346.42 Possibilities.WOTVAX::BATTYWell, I wouldn't start from here!Fri Feb 14 1992 16:5323
    Assuming that you've got a preamp or integrated amplifier with 
    various inputs, but the only pair unused are the 'phono' or record 
    deck inputs, there are two possible alternatives.
    
    1. You need to reduce the level of the signal from the VCR 
    significantly, to avoid overloading the phono input. It then gets 
    re-amplified back to line level by the preamp, so will introduce 
    noise. It can be done by using divider resistor networks, but the 
    only advantage is cheapness, it's not a sonically ideal way to 
    proceed.
    
    2. The best way is to get an 'input expander' unit as supplied by 
    QED and other audio gizmo manufacturers. This is an 'outboard' 
    switch box, which allows 2/3/4 sources to be connected to one 
    input. Ask your local 'mass audio' shop or Tandy. It's a widely 
    available device.
    
    (From memory, I think QED also make a box specifically for 
    switching a CD and a turntable into a turntable input, but you 
    might as well go for a multi input box, and then you've still got 
    a spare set for the next toy - DAT or whatever.)
    
    Mike in Warrington
346.5SUBURB::SCREENERRobert Screene, UK Finance EUCFri Feb 14 1992 17:235
    RE: .4
    
    We're talking a VCR player source here, not an LP12!
    
    Robert.
346.6Telephono/angliophono/megaphono ono!UFHIS::JMASLENThe wheels fallen off your day yet?!Mon Feb 17 1992 08:339
    If you are talking about a 'Phono' input (as in record player) then it
    is not going to sound too good with the RIAA equaliser circuit already
    inside the amp as well as your video's audio signal overloading the
    input.
    
    If you are talking phonotype plugs the do as was earlier mentioned, go
    in to the amp via the 'AUX' input.
    
    cheers fjeff
346.7WOTVAX::BATTYWell, I wouldn't start from here!Mon Feb 17 1992 11:1330
Re: Most of the previous replies.

If we're not careful, we are going to get the guy bent out of shape instead 
of answering a straightforward query.

>    How would I connect a NICAM stereo video up to a stereo system with
>    only phono inputs available?  I assume the phono inputs are somehow
>    'tuned' to receive the weird levels that record decks kick out, so what
>    would I need to do make 'em compatible to the videos output?
    
As I read his question, he has several inputs on the amplifier, but the only 
ones not used at present are the ones for the record deck. It is possible to 
use these with a line level input (as in VCR), by reducing the signal way 
down to cartridge level. Sure it won't sound perfect, but half a dozen 
resistors won't break the bank either!

I've credited the guy with enough intelligence to know that he could use AUX, 
CD or TAPE inputs, and therefore assumed they are all in use. My second 
and favoured suggestion is for him to buy a seperate switchbox which will 
allow him to 'fan-in' several sources into one of his AUX type inputs.

I tossed in the suggestion about the CD/Record Deck box just in case he has 
one of the strange breed of midi/mini systems which use their own type of 
dedicated interconnects, and genuinely the only externally available inputs 
are for the record deck.

Let's lighten up and answer the questions as asked, not take cheap shots at 
each other!

Mike.
346.8Sorry for the confusion!!!CURRNT::KINGI'm afraid you've got cows Mr FarnsworthMon Feb 17 1992 11:4425
    
    
    Yeah, er...sorry for taking so long to get back here, but I've been off
    the net for a few days...
    
    
    
    Firstly, thanks for all the suggestions so far.
    
    Secondly, here's some for info to clarify the situation:-
    
    	
    The video is a NICAM job with a SCART output/input and a set of L/R
    outputs (phono sockets).  The stereo system I want to connect to is of
    the type where the wiring is all internal and the only input available
    is through the record deck input.  As has been said, the circuitry in
    the main box (amp/CD/tuner/tapes) is set up to compensate for the
    record deck input signal.
    
    So, I suppose I really want some suggestions as to what can be plugged
    in-between the video and the stereo to make the signal useable by the
    stereo.
    
    
    Chris.
346.9FORTY2::SHIPMANMOGTue Feb 18 1992 08:163
See 87.*.

Nick
346.10CURRNT::KINGI'm afraid you've got cows Mr FarnsworthTue Feb 18 1992 13:406
    
    
    Thanks, I'll get someone to try that out (I don't trust myself with
    electronics!! =;*)  ).
    
    chris.