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Televisions

Trace

By Trace
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LadyG Veteran II

LadyG

Posted
Posted (edited)

Refering to the subject of televisions, perhaps?

I inherited a smart TV, so far, it has done absolutely nothing.

 

Edited by LadyG
LadyG Veteran II

LadyG

Posted
Posted
5 minutes ago, Nightwatch said:

We have a telly that is both 12v and 240v. We have created a choice.

Decisions, decisions, you have created a perfect storm 

LadyG Veteran II

LadyG

Posted
Posted (edited)
4 minutes ago, Goliath said:

I too have a Tv which is 12v and 240v

 

plus an iPad upon which I watch iplayer

 

I have created a further choice 

 

 

I have two tablets and two mifi's ..... Not sure if that creates choice or chaos, they both seem to be imperfect. My phone also has some irregular imput

Edited by LadyG
Cheshire cat Experienced

Cheshire cat

Posted
Posted

Someone on here offered an opinion that better decoders were fitted to 240 volt tv so I took them at their word and bought a 240 Volt LG TV. With an omnimax aerial attached to a signal booster it has never failed to find 100+ tv stations.

Richard10002 Veteran II

Richard10002

Posted
Posted
9 minutes ago, Cheshire cat said:

Someone on here offered an opinion that better decoders were fitted to 240 volt tv so I took them at their word and bought a 240 Volt LG TV. With an omnimax aerial attached to a signal booster it has never failed to find 100+ tv stations.

You might find that the power adapter provides the TV with 19V DC. At least that's what I found with a 24" LG I owned for a while. Also saw a lot of bigger Sony TVs, (up to 40" or so), an adapter to convert 240V AC to 19V DC.

Dr Bob Veteran II

Dr Bob

Posted
Posted
41 minutes ago, LadyG said:

I have two tablets 

I took 3 today. One was a vitamin D tablet and the other two were echinaecia. Stops colds you know! Don't tell Donald.

 

43 minutes ago, LadyG said:

............ also has some irregular imput

.......better than irregular output!?

Tracy D'arth Veteran II

Tracy D'arth

Posted
Posted

Many mains TVs are really 12v ones and include an adaptor box to work off mains. Our Bush is like that. Its not

too easy to find out which models are like this, I went into Argos and they were very good, opened a few boxes to discover if they worked on 12v, it doesn't say on the outside of the box.

Then you can get a 12v stabilised adaptor to run it safely off the batteries when the alternator is pumping out 14 + volts.

Richard10002 Veteran II

Richard10002

Posted
Posted
2 minutes ago, Tracy D'arth said:

Many mains TVs are really 12v ones and include an adaptor box to work off mains. Our Bush is like that. Its not

too easy to find out which models are like this, I went into Argos and they were very good, opened a few boxes to discover if they worked on 12v, it doesn't say on the outside of the box.

Then you can get a 12v stabilised adaptor to run it safely off the batteries when the alternator is pumping out 14 + volts.

If you go into John Lewis, you can see the back of most of the TVs they sell. You can quickly see whether the input cable is DC or AC then, if it's DC, you can get a bit closer and see the voltage.

WotEver Veteran II

WotEver

Posted
Posted
1 minute ago, Richard10002 said:

If you go into John Lewis, you can see the back of most of the TVs they sell. You can quickly see whether the input cable is DC or AC then, if it's DC, you can get a bit closer and see the voltage.

It doesn’t actually matter that much what the D.C. voltage is. You can get 12V adaptors that supply all sorts of voltages. 

  • Greenie 1
blackrose Veteran II

blackrose

Posted
Posted (edited)
7 hours ago, Jen-in-Wellies said:

Welcome to the forum. Do you have 240V pure sine wave available on board?

You don't necessarily need a pure sine wave inverter. Mine is semi-sine wave and the TV works fine.

Edited by blackrose
ditchcrawler Veteran II

ditchcrawler

Posted
Posted
6 hours ago, blackrose said:

You don't necessarily need a pure sine wave inverter. Mine is semi-sine wave and the TV works fine.

But some hum, its a bit late when you have bought it to find the set up doesnt work

Jen-in-Wellies Veteran II

Jen-in-Wellies

Posted
Posted (edited)
1 hour ago, ditchcrawler said:

But some hum, its a bit late when you have bought it to find the set up doesnt work

This is why I said pure sine wave. I get hum over the speakers when I run things from the cheapo emergency backup inverter the couple of times when the posh Victron throws a tantrum. There are higher frequency harmonics in the modified sine wave that can get through to the speakers sometimes.

Jen

Edited by Jen-in-Wellies
  • Greenie 1
  • Happy 1
WotEver Veteran II

WotEver

Posted
Posted
5 hours ago, Jen-in-Wellies said:

There are higher frequency harmonics in the modified sine wave that can get through to the speakers sometimes.

Yep. If you draw a sine wave then add the second harmonic over the top, then the third, and keep going... you get a square wave :)

Scholar Gypsy Veteran

Scholar Gypsy

Posted
Posted (edited)
17 hours ago, WotEver said:

Yep. If you draw a sine wave then add the second harmonic over the top, then the third, and keep going... you get a square wave :)

Indeed, you can get any periodic waveform you like (eg square) by adding harmonics at the right amplitudes.  Fourier series/transform theory, which I have not quite forgotten.

Edited by Scholar Gypsy

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