Watching TV on vintage sets... - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

oldeurope · 12th Feb 2006, 10:18 am

Quote:

Originally Posted by yagosaga

Hi Darius,...
Is it possible to get the pure synchron signal out of your PCB for driving the monitor.
Kind regards,
Eckhard

Hi Eckhard, yes of course. A pure synchron signal is at Pin 1 of the LM 1881.
You should place an emitter follower at it's output.

Kind regards
Darius

oldeurope · 12th Feb 2006, 10:51 am

Hi, I made a little drawing attached how an emitter follower looks like.

The LM1881 has a lot of usefull outputs:

Pin 1 negative going composite sync output

Pin 3 negative going vertical sync output

Pin 5 Burst/ Back Porch output

Pin 7 odd/even frame detect output

At the 74121 you have a vertical blanking output,
positive going at pin 6 and negative going a pin1.

If you don't need the colour trap L1 C16/17 Q12 can operate as
an open collector inverter, input at JP7.

Kind regards
Darius

yagosaga · 12th Feb 2006, 12:11 pm

Quote:

Originally Posted by Darius

Hi, I made a little drawing attached how an emitter follower looks like. ...

Hi Darius, thanks a lot! Today I have time for soldering, and your changes seems easy to realise.

To ppppenguin: only the line output unit used valves. All other units are transistorised. But there is no IC. On some capacitors I read the time stamp of 2/69.
A switch for external or internal sync is not identified. Unusual are -18 volts at the grid of the crt. I would expect 60 - 80 volts positive here, and the brightness control has no effect. I will check the path of the brightness control current.

Kind regards
Eckhard

oldeurope · 22nd Feb 2006, 10:24 am

Good morning,
for removing Macrovision in the vertical flyback, please don't load D3.

Kind regards
Darius

yagosaga · 22nd Feb 2006, 3:04 pm

Quote:

Originally Posted by Darius

Good morning,
for removing Macrovision in the vertical flyback, please don't load D3.

Hi Darius,
did you already test it with a Macrovision DVD?
Kind regards,
Eckhard

oldeurope · 22nd Feb 2006, 3:55 pm

Quote:

Originally Posted by yagosaga

Hi Darius,
did you already test it with a Macrovision DVD?
Kind regards,
Eckhard

Yes!

Darius

oldeurope · 2nd Mar 2006, 12:34 pm

http://bs.cyty.com/menschen/e-etzold.../uvb/uvb_e.htm

The UVB has a website now.

Kind regards
Darius

oldeurope · 31st Jul 2006, 8:17 am

Quote:

Originally Posted by oldeurope

Good morning,
for removing Macrovision in the vertical flyback, please don't load D3.

Kind regards
Darius

Some words about Macrovision and the UVB.

Removing Macrovision is illegal.
The UVB does not remove Macrovision.
It limits the bright parts during the V- blanking periode to ensure that the vertical flyback is not visible on vintage TV sets.
Macrovision is still present after the UVB and will be detected form DVD recorders etc.

Kind regards
Darius

molochkartovski · 31st Jul 2006, 6:50 pm

Quote:

Originally Posted by oldeurope

Good evening,
now I knew it exactly.
I'll sent it in a big registred letter.
Sent to Germany 3,05 Euros; EU 4,55 Euros; Worldwide 6,05 Euros
and the 18 Euros for the kit.
For example airsure to USA costs 24,05 Euros.
It is possible to pack two kits in one big letter.

Kind regards
Darius

Darius is this kit sill available?
It'll be nice to be able to watch TV with out all the junk in the flyback

Richard

oldeurope · 1st Aug 2006, 7:13 am

Quote:

Originally Posted by molochkartovski

Darius is this kit sill available?
It'll be nice to be able to watch TV with out all the junk in the flyback

Richard

Yes, it is.

Darius

stephanie · 1st Aug 2006, 4:52 pm

Quote:

Originally Posted by oldeurope

Removing Macrovision is illegal.

Big Whoopee.

There are add-on boxes that do just that. I have one of them. Enables me to make videotape copies of DVDs or other macrovision encoded videotapes if I were so inclined.

However its primary purpose is to stabilize the video enough so I can feed it through an RF modulator and then tune in on my television through VHF channel 3.

DoctorWho · 3rd Aug 2006, 9:12 am

What a brilliant design, do yuo plan to make these available at all?

oldeurope · 3rd Aug 2006, 6:32 pm

Quote:

Originally Posted by DoctorWho

What a brilliant design, do yuo plan to make these available at all?

The kit is available, or do you mean a finished thing?

Kind regards,
Darius

DoctorWho · 4th Aug 2006, 9:11 am

Well either really, it would just be so useful. How do any of us place an order with you?

Peter.

molochkartovski · 4th Aug 2006, 6:37 pm

Quote:

Originally Posted by DoctorWho

Well either really, it would just be so useful. How do any of us place an order with you?

Peter.

PM Darius I've ordered mine

Richard

oldeurope · 5th Aug 2006, 9:27 am

Good morning,

the UVB makes only sense with NTSC or PAL vision signals.
And it is able to add the (V-) sync pedestals that were common
in USA 525 and german 625.

In 405 you don't have to remove teletext or colour. This should be done by your standard converter.
If you want to build a modulator it makes sense for every standard. It is able to make the biasing for an NPN or PNP "transconductance modulator".

In 405 a V-sync pedestal reduces vertical flyback lines too.

Kind regards
Darius

12th Feb 2006, 10:51 am	#22
oldeurope Retired Dormant Member Join Date: Dec 2003 Location: Solingen, Germany Posts: 727	Re: Watching TV on vintage sets... Hi, I made a little drawing attached how an emitter follower looks like. The LM1881 has a lot of usefull outputs: Pin 1 negative going composite sync output Pin 3 negative going vertical sync output Pin 5 Burst/ Back Porch output Pin 7 odd/even frame detect output At the 74121 you have a vertical blanking output, positive going at pin 6 and negative going a pin1. If you don't need the colour trap L1 C16/17 Q12 can operate as an open collector inverter, input at JP7. Kind regards Darius Attached Thumbnails

22nd Feb 2006, 10:24 am	#24
oldeurope Retired Dormant Member Join Date: Dec 2003 Location: Solingen, Germany Posts: 727	Re: Watching TV on vintage sets... Good morning, for removing Macrovision in the vertical flyback, please don't load D3. Kind regards Darius

2nd Mar 2006, 12:34 pm	#27
oldeurope Retired Dormant Member Join Date: Dec 2003 Location: Solingen, Germany Posts: 727	Re: Watching TV on vintage sets... http://bs.cyty.com/menschen/e-etzold.../uvb/uvb_e.htm The UVB has a website now. Kind regards Darius

3rd Aug 2006, 9:12 am	#32
DoctorWho Rest in Peace Join Date: Apr 2005 Location: Devon Posts: 850	Re: Watching TV on vintage sets... What a brilliant design, do yuo plan to make these available at all?

4th Aug 2006, 9:11 am	#34
DoctorWho Rest in Peace Join Date: Apr 2005 Location: Devon Posts: 850	Re: Watching TV on vintage sets... Well either really, it would just be so useful. How do any of us place an order with you? Peter.

5th Aug 2006, 9:27 am	#36
oldeurope Retired Dormant Member Join Date: Dec 2003 Location: Solingen, Germany Posts: 727	Re: Watching TV on vintage sets... Good morning, the UVB makes only sense with NTSC or PAL vision signals. And it is able to add the (V-) sync pedestals that were common in USA 525 and german 625. In 405 you don't have to remove teletext or colour. This should be done by your standard converter. If you want to build a modulator it makes sense for every standard. It is able to make the biasing for an NPN or PNP "transconductance modulator". In 405 a V-sync pedestal reduces vertical flyback lines too. Kind regards Darius