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 !

Wednesday, November 24, 2010

WHITE WESTINGHOUSE DAYTONA 837 Chassis Formenti F8 Detailed Viewing.










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Supply with TDA4601 (Siemens)

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.




- Line deflection output (S2000)

- Frame deflection output TDA3653 (PHILIPS)

- Chroma + Luminance with TDA3562A (PHILIPS)

- IF + Synchronization with TDA4502A (PHILIPS)

- Tuner

- Audio Unit

--------------------------------------------------

TDA3562A

PAL/NTSC ONE-CHIP DECODER
DESCRIPTION


The TDA3562A is a monolithic IC designed as
decode PAL and/or NTSC colour television standards
and it combines all functions required for the
identification and demodulation of PAL and NTSC
signals.


.CHROMINANCE SIGNALPROCESSOR

.LUMINANCE SIGNAL PROCESSING WITH
CLAMPING

.HORIZONTAL AND VERTICAL BLANKING
.LINEAR TRANSMISSION OF INSERTED
RGB SIGNALS
.LINEAR CONTRAST AND BRIGHTNESS
CONTROL ACTING ON INSERTED AND MATRIXED
SIGNALS
.AUTOMATIC CUT-OFF CONTROL
.NTSC HUE CONTROL

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