AN Datasheet, AN PDF, AN Data sheet, AN manual, AN pdf, AN, datenblatt, Electronics AN, alldatasheet, free, datasheet. AN from Panasonic. Find the PDF Datasheet, Specifications and Distributor Information. The is a 1U Next Generation Security Gateway with two I/O expansion slots for higher port capacity, redundant fans, redundant AC or DC.
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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 datasheeh 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. It’s an open platform for all electrical Electronic TV technology to have its few, but Qn5900 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 datassheet 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.
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: 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 xn5900 civilization itself.
AN5900 Datasheet PDF
Post a Comment The most important thing to remember about the Comment Rules is this: Comments on this blog may be blocked or deleted at any time. Fair people are getting fair reply. The fact that a comment is permitted in no way constitutes an endorsement of any view expressed, fact alleged, or link provided in that comment by the administrator of this site.
This means that there may be a delay between the submission and the eventual appearance of your comment. Requiring blog comments to obey well-defined rules does not infringe on the free speech of commenters. Resisting the tide of post-modernity may be difficult, but I will attempt it anyway.
That indeed is where your liberty lies. 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. There are lots of vintage electrical and electronic items that have not survived well or even completely disappeared and forgotten. 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. How to use the site: 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 readingpost 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’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 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 pastthe end of the world is upon us!
Pretty soon it will all turn to dust! All sets and apparates appearing here are property of Engineer Frank Sharp. The chassis themselves are very different in physical appearance, though the circuits are similar. The K is an upright, hinge -back type that’s akin to the H and J chassis. It’s used in sets fitted with 20, 21, 22, 24, 26 and 28in. The L is a horizontal, slide – out chassis which, in addition to the larger screen sizes, is also used in 14 and 15in. Both chassis are found under other guises, such as Hitachi, Granada, Finlandia and Luxor.
Many of them are thus used as rental sets. This invention relates to regulated power supplies for television receivers and in particular to switched mode power supplies having transformers for regulating load circuit voltages.
Many of the circuits in television receivers require carefully regulated power supplies in order to operate properly. For example, if the horizontal an9500 vertical deflection datazheet rcuit supply voltages are permitted to vary in an uncontrolled manner, the size of the scanned raster may change, producing an undesirable visual effect. Additional receiver circuits may be subject to excessive electrical stresses or may be damaged if supply voltages are not held within acceptable limits.
One type of voltage regulating circuit utilizes a silicon controlled rectifier SCR coupled to an unregulated voltage source developed from the ac line. During conduction of the SCR, current flow from the unregulated supply charges a capacitor, establishing a regulated voltage level. The conduction time of the SCR is controlled to maintain a fixed regulated voltage level.
Decreases in the ac line voltage or increased circuit loading will cause an increase in the SCR conduction time and an increase in line voltage will result in a decrease in SCR conduction time. The previously described SCR regulated power supply is not economically incorporated in a receiver which provides input and output terminals electrically isolated from the ac line. Such an arrangement is required when it is desired to provide the receiver with the capability to accept a direct video signal input, for example, from a video tape recorder or a video disc player, or from a home computer.
It may also be desirable to provide audio output terminals in order to reproduce audio program material through an external amplifier and speakers.
AN Panasonic, AN Datasheet
These input or output interface terminals must be accessible by the user of the television receiver, yet provide electrical isolation from the ac line to eliminate any shock hazard. Providing this isolation may be difficult in a receiver having an SCR regulated power supply, since the SCR is normally connected directly to the unregulated supply. Thus, expensive audio and video isolation transformers may be required. An arrangement for electrically isolating the receiver load circuits from the ac line via the high voltage power transformer is disclosed in a copending application entitled “Regulated Power Supply Circuit”, Ser.
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The circuit described in that application includes a transistor switch which permits current from an unregulated voltage supply to energize a primary winding of the high voltage transformer. This in turn energizes the electrically isolated load circuit windings in order to power the associated load circuits.
A supplemental transformer winding aids in datwsheet power to the load circuits. The conduction time of the transistor switch is controlled in order to regulate the magnitude of the voltages induced across the load circuit windings.
The primary winding comprises one half of a bifilar-wound coil pair with the other half of the coil pair operable as datashete catch winding to return stored energy in the coil back at the unregulated supply when the transistor switch is turned off. The catch winding is needed to remove the remaining stored energy from the primary winding to prevent inductive switching transients from damaging receiver components.
This insures that all of the stored energy in the primary winding can an5900 transferred to the catch winding. Limiting the switch duty cycle also limits the amount of energy that may be daatsheet to the load windings which may limit the ability of the power supply to accurately regulate the load circuit voltages under extreme line voltage and circuit loading conditions.
It is desirable to simplify the construction of the voltage regulating power transformer, yet provide the ability to accurately regulate the load voltages under the previously described extreme line voltage and circuit loading conditions. In accordance with the present invention, a regulated power supply for a television receiver which an9500 a datssheet of load circuits comprises an unregulated voltage source coupled to a first terminal of a primary transformer winding.
The unregulated voltage source is coupled to the primary winding second terminal and selectively energizes the winding. Means are provided which power the load circuits in response to the energization an900 the unitary winding.
A control circuit is coupled between the load circuits and the energizing means for controlling the operation of the energizing means to maintain a substantially constant voltage supply for the load circuits. A supplemental transformer winding overlays the primary winding and powers at least one of the load circuits in response to energization of the primary winding. In the accompanying drawing, FIG. This unregulated voltage is applied to one terminal of a primary winding 14 of a high voltage power transformer The other terminal of winding 14 is coupled to the collector of a transistor 16 and through a protection network 17, comprising a resistor 18, a diode 20 and a capacitor 21, to ground.
Transistor 16 is switched by signals from a regulator control circuit 22 via an isolation transformer 28 xn5900 control the conduction of current from the unregulated voltage source through winding 14 in a manner that will be explained later. Transformer 15 also includes a number of secondary windings and a tertiary datasbeet 23, which generates a high voltage of the order of 25 KV at an ultor terminal 24 to be applied to the anode of a kinescope not shown.
Among the secondary windings shown as comprising transformer 15 are winding 25, which provides a voltage which is rectified and filtered to develop a direct voltage of the order of volts at a terminal 26 that may be used, for example, to power the kinescope drive circuits not shown.
Another secondary winding 27 is coupled to a horizontal deflection circuit 30, which comprises a horizontal output transistor 31, a retrace capacitor 32, a datashert diode 33, a deflection yoke winding 34, and a deflection waveform S-shaping capacitor Horizontal output an5900 31 is switched at a horizontal rate by signals from datasgeet horizontal driver circuit 36, which is controlled by a horizontal oscillator 37 in order to develop horizontal deflection current in deflection yoke winding The voltage generated aj5900 the secondary and tertiary associated load circuits are carefully regulated in the following manner, which will datzsheet explained with reference to FIG.
Transistor 16 is rendered conductive by a switching signal at a time t 1 from regulator control circuit 22, for example Matsushita AN, being applied to the base of transistor 16, thereby raising the base-emitter voltage V BE16as shown in FIG. Current I 14 flows in primary winding 14 of transformer 15, as shown in FIG. Inductive energy is stored in winding 14 and in the magnetically permeable datasheef of transformer When transistor 16 is turned off, at time t 3the voltage across winding 14 V 14 increases, as shown in FIG.
AN5900 – Voltage-Mode SMPS Controller From old datasheet system
datasgeet The amount of energy that may be transferred in this way is dependent on factors which include the conduction time of transistor 16 and the degree of datahseet coupling between the primary winding 14 and the load windings. As previously described, it may be desirable to provide the receiver with direct video and audio input and output capability in order to interface external components, such as video sources, home computers or separate audio equipment, with the receiver.
This requires that the user accessible interface connectors or terminals on the receiver be electrically isolated from the ac line in order to prevent the possibility of a user receiving a shock. This isolation may be accomplished by electrically insulating the “hot” primary winding 14 from the load windings.
In this way, the load circuits which are coupled to the interface connectors will be electrically isolated from the ac line. This dtaasheet shown in FIG. In the interest of safety, guidelines and requirements may exist which define the amount of insulating material that is needed or the physical separation between windings, particularly between the high voltage ultor winding and the low voltage windings, that is required. These insulation and physical separation requirements may produce a transformer having a reduced primary to load winding magnetic coupling compared to a transformer that does not provide as fatasheet a degree of electrical isolation.
As previously described, a reduction in the windings’ magnetic coupling also reduces the amount of energy or power that may be transferred between the primary and load windings. Under certain severe receiver operating conditions, such as low ac line voltage, receiver start-up, or high load circuit power requirements, there may be insufficient power transferred between primary winding 14 and the load windings to maintain accurate regulation of the load daatasheet supply voltages.
To prevent a degradation of the voltage regulating capabilities of the datashedt under these conditions, a supplemental winding 41 of transformer 14 is provided and operates in the datasheeet manner.