Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and information about some of the electronic, electrical and electrotechnical technology relics that the Frank Sharp Private museum has accumulated over the years .

Premise: There are lots of vintage electrical and electronic items that have not survived well or even completely disappeared and forgotten.

Or are not being collected nowadays in proportion to their significance or prevalence in their heyday, this is bad and the main part of the death land. The heavy, ugly sarcophagus; models with few endearing qualities, devices that have some over-riding disadvantage to ownership such as heavy weight,toxicity or inflated value when dismantled, tend to be under-represented by all but the most comprehensive collections and museums. They get relegated to the bottom of the wants list, derided as 'more trouble than they are worth', or just forgotten entirely. As a result, I started to notice gaps in the current representation of the history of electronic and electrical technology to the interested member of the public.


Following this idea around a bit, convinced me that a collection of the peculiar alone could not hope to survive on its own merits, but a museum that gave equal display space to the popular and the unpopular, would bring things to the attention of the average person that he has previously passed by or been shielded from. It's a matter of culture. From this, the Obsolete Technology Tellye Web Museum concept developed and all my other things too. It's an open platform for all electrical Electronic TV technology to have its few, but NOT last, moments of fame in a working, hand-on environment. We'll never own Colossus or Faraday's first transformer, but I can show things that you can't see at the Science Museum, and let you play with things that the Smithsonian can't allow people to touch, because my remit is different.

There was a society once that was the polar opposite of our disposable, junk society. A whole nation was built on the idea of placing quality before quantity in all things. The goal was not “more and newer,” but “better and higher" .This attitude was reflected not only in the manufacturing of material goods, but also in the realms of art and architecture, as well as in the social fabric of everyday life. The goal was for each new cohort of children to stand on a higher level than the preceding cohort: they were to be healthier, stronger, more intelligent, and more vibrant in every way.

The society that prioritized human, social and material quality is a Winner. Truly, it is the high point of all Western civilization. Consequently, its defeat meant the defeat of civilization itself.

Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

OLD, but ORIGINAL, Well made, Funny, Not remotely controlled............. and not Made in CHINA.

How to use the site:

- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

Every CRT Television saved let revive knowledge, thoughts, moments of the past life which will never return again.........

Many contemporary "televisions" (more correctly named as displays) would not have this level of staying power, many would ware out or require major services within just five years or less and of course, there is that perennial bug bear of planned obsolescence where components are deliberately designed to fail and, or manufactured with limited edition specificities..... and without considering........picture......sound........quality........

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

Have big FUN ! !
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©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All sets and apparates appearing here are property of
Engineer Frank Sharp. NOTHING HERE IS FOR SALE !

Saturday, January 1, 2011

PANASONIC TX-28LD1C CHASSIS EURO 2-S VIEW








This is one of the PANASONIC DIGITAL CHASSIS versions Implementing DIGITAL SIGNAL PROCESSING and basing it on the ITT DIGIVISION DIGIT3000 family chipset.

It's a successor of EURO 2 L and a full successor of the PANASONIC EURO 1 DIGITAL CHASSIS which can be seen HERE soon or later !!


It's developed on a Single PCB with one Vertical unit which is a Input selector for A/V and contains the MSP3400 Digital Sound Processor.













Power Supply is Based on the well known TDA4601

TDA4601 Operation.

* The TDA4601 device is a single in line, 9 pin chip. Its predecessor was the TDA4600
device, the TDA4601 however has improved switching, better protection and cooler running.

The (SIEMENS) TDA4601 power supply is a fairly standard parallel chopper switch mode type,
which operates on the same basic principle as a line output stage. It is turned on and off by a
square wave drive pulse, when switched on energy is stored in the chopper transformer
primary winding in the form of a magnetic flux; when the chopper is turned off the magnetic
flux collapses, causing a large back emf to be produced. At the secondary side of the chopper
transformer this is rectified and smoothed for H.T. supply purposes.
The advantage of this type of supply is that the high chopping frequency (20 to 70 KHz
according to load) allows the use of relatively small H.T. smoothing capacitors making
smoothing easier. Also should the chopper device go short circuit there is no H.T. output.


In order to start up the TDA4601 I.C. an initial supply of 9v is required at pin 9, this voltage
is sourced via R818 and D805 from the AC side of the bridge rectifier D801, also pin 5
requires a +Ve bias for the internal logic block. (On some sets pin 5 is used for standby
switching). Once the power supply is up and running, the voltage on pin 9 is increased to 16v
and maintained at this level by D807 and C820 acting as a half wave rectifier and smoothing
circuit.

PIN DESCRIPTIONS
Pin 1 This is a 4v reference produced within the I.C.
Pin 2 This pin detects the exact point at which energy stored in the chopper transformer
collapses to zero via R824 and R825, and allows Q1 to deliver drive volts to the
chopper transistor. It also opens the switch at pin 4 allowing the external capacitor
C813 to charge from its external feed resistor R810.
Pin 3 H.T. control/feedback via photo coupler D830.
The voltage at this pin controls the on time of the chopper transistor and hence the
output voltage. Normally it runs at Approximately 2v and regulates H.T. by sensing a
proportion of the +4v reference at pin 1, offset by conduction of the photo coupler
D830 which acts like a variable resistor. An increase in the conduction of transistor
D830 and therefor a reduction of its resistance will cause a corresponding reduction
of the positive voltage at Pin 3. A decrease in this voltage will result in a shorter
on time for the chopper transistor and therefor a lowering of the output voltage and
vice versa, oscillation frequency also varies according to load, the higher the load the
lower the frequency etc. should the voltage at pin 3 exceed 2.3v an internal flip
flop is triggered causing the chopper drive mark space ratio to extend to 244 (off
time) to 1 (on time), the chip is now in over volts trip condition.
Pin 4 At this pin a sawtooth waveform is generated which simulates chopper current, it is
produced by a time constant network R810 and C813. C813 charges when the
chopper is on and is discharged when the chopper is off, by an internal switch
strapping pin 4 to the internal +2v reference, see Fig 2.
The amplitude of the ramp is proportional to chopper drive. In an overload
condition it reaches 4v amplitude at which point chopper drive is reduced to a
mark-space ratio of 13 to 1, the chip is then in over current trip.

The I.C. can easily withstand a short circuit on the H.T. rail and in such a case the
power supply simply squegs quietly. Pin 4 is protected by internal protection
components which limit the maximum voltage at this pin to 6.5v.
Should a fault occur in either of the time constant components, then the chopper
transistor will probably be destroyed.
Pin 5 This pin can be used for remote control on/off switching of the power supply, it is
normally held at about +7v and will cause the chip to enter standby mode if it falls
below 2v.
Pin 6 Ground.
Pin 7 Chopper switch off pin. This pin clamps the chopper drive voltage to 1.6v in order to
switch off the chopper.
Pin 8 Chopper base current output drive pin.
Pin 9 L.T. pin, approximately 9v under start-up conditions and 16v during normal running,
Current consumption of the I.C. is typically 135mA. The voltage at this pin must
reach 6.7v in order for the chip to start-up.

Frame Deflection Output with TDA8175

Audio Out with LA4290

MAIN CPU CCU3000




Single-Chip Video Processor VDP 3108





1. Introduction
The entire video processing and controlling for a color
TV has been developed on a single chip in 0.8m CMOS
technology. Modular design and submicron technology
allow the economic integration of features in all classes
of TV sets.
Open architecture is the key word to the new DSP generation.
Flexible standard building blocks have been defined
that offer continuity and transparency of the entire
system.


























Single-Chip Video Processor
1. Introduction
The entire video processing and controlling for a color
TV has been developed on a single chip in 0.8m CMOS
technology. Modular design and submicron technology
allow the economic integration of features in all classes
of TV sets.
Open architecture is the key word to the new DSP generation.
Flexible standard building blocks have been defined
that offer continuity and transparency of the entire
system.
One IC contains the entire video and deflection processing
and builds the heart of a modern color TV. Its performance
and complexity allow the user to standardize
his product development. Hardware and software applications
can profit from the modularity as well as manufacturing,
system support or maintenance. The main
features are:
– low cost, high performance
– all digital video processing
– multi-standard color decoder PAL/NTSC/SECAM
– 3 composite, 1 S–VHS input
– integrated high-quality AD/DA converters
– sync and deflection processing
– luminance and chrominance features, e.g.
peaking, color transient improvement
– programmable RGB matrix
– various digital interfaces
– embedded RISC controller (80 MIPS)
– one crystal, few external components
– single power supply 5 V
– 0.8m CMOS Technology
– 68-pin PLCC or 64-pin Shrink DIL Package
1.1. System Architecture
Two main modules have been defined:
Video Processor and
Display Processor.
They are designed as silicon building blocks. Their partitioning
permits a variety of IC configurations with the aim
to satisfy the particular requirements of different applications.
Both, analog and digital interfaces, support
state of the art TV receivers as well as other environments.
Fig. 1–1 shows the block diagram of the singlechip
Video Processor which consists of both modules.


2. Functional Description


2.1. Analog Front End
This block provides the analog interfaces to all video inputs
and mainly carries out analog-to digital conversion
for the following digital video processing. A block diagram
is given in figure 2–1.
Most of the functional blocks in the front end are digitally
controlled (clamping, AGC and clock-DCO). The control
loops are closed by the Fast Processor (‘FP’) embedded
in the decoder.



2.1.1. Input Selector
Up to four analog inputs can be connected. Three inputs
are for input of composite video or S–VHS luma signal.
These inputs are clamped to the sync back porch and
are amplified by a variable gain amplifier. One input is
for connection of S–VHS carrier–chrominance signal.
This input is internally biased and has a fixed gain amplifier.


2.1.2. Clamping
The composite video input signals are AC coupled to the
IC. The clamping voltage is stored on the coupling capacitors
and is generated by digitally controlled current
sources. The clamping level is the back porch of the video
signal. S-VHS chroma is also AC coupled. The input
pin is internally biased to the center of the ADC input
range.


2.1.3. Automatic Gain Control
A digitally working automatic gain control adjusts the
magnitude of the selected baseband by +6/–4.5 dB in 64
logarithmic steps to the optimal range of the ADC .
The gain of the video input stage including the ADC is
213 steps/V for all three standards (PAL/NTSC/SECAM/
Y/C), with the AGC set to 0 dB.



2.1.4. Analog-to-Digital Converters
Two ADCs are provided to digitize the input signals.
Each converter runs with 20.25 MHz and has 8 bit resolution.
An integrated bandgap circuit generates the required
reference voltages for the converters.
The two ADCs are of a 2-stage subranging type.

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