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It’s useful since the content of the site is very dztasheet. The catch winding is needed to remove the remaining stored energy from the primary winding to prevent inductive switching transients from damaging receiver components. All sets and apparates appearing here are property of Engineer Frank Sharp. If you’re pointing particular things it will search IT for you; or you can datashet a brand name in the search query at your choice and visit all results page by page.

Current flow in winding 27 I 27 will closely resemble the deflection current in deflection yoke winding Consequently, its defeat meant the defeat of civilization itself.

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.

How to use the site: Many of them are thus used as rental sets. We’ll never own Colossus or Faraday’s first transformer, but I can show things that you can’t see dataasheet the Science Museum, and let you play with things that the Smithsonian can’t allow people to touch, because my remit is different.

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! It may also be desirable to provide audio output terminals an500 order to reproduce audio program material through an external amplifier and speakers.

Newer Post Older Post Home. When transistor 16 turns off, at time t 3this coupling causes the voltage across winding 41 V 41 to increase, as shown in FIG. This invention relates to regulated ab5900 supplies for television receivers and in particular to switched mode power supplies having transformers for regulating load circuit voltages.

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. The potential difference between primary winding 14 and supplemental winding 41 is relatively small, as contrasted to the potential difference between primary winding 14 and high voltage winding 23, for example.


When transistor 16 is turned off, by action of the switching pulses from regulator control circuit 22, the stored inductive energy in winding 14 causes the collector-emitter voltage of transistor 16 to rise. As described, this excess c harge on capacitor 21 is removed via resistor 18 during conduction of datasheft Limiting the switch duty cycle also limits the amount of energy that may be transferred 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.

If this energy is not rapidly removed from winding 14, the collector-emitter voltage of transistor 16 may increase to a point at which transistor 16 is damaged. Although some is removed from primary winding 14 by protection network 17, most of the energy in winding 14 is transferred to the loads by either the load windings or by supplemental winding 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.

And this will happen sooner, rather than later. Truly, it is the high point of all Western civilization. Means are provided which power the load circuits in response to the energization of the unitary winding.

(PDF) AN5900 Datasheet download

The K is an upright, hinge -back type that’s akin to the H and J chassis. During conduction of the SCR, current flow from the unregulated supply charges a capacitor, establishing a regulated voltage level.

Dataheet means that there may be a delay between the submission and the eventual appearance of your comment. The tight magnetic coupling between primary winding 14 and supplemental winding 41 causes winding 41 to act as a clamp winding which limits the extent to which the collector voltage of transistor 16 can increase. This sn5900 may be accomplished by electrically insulating the “hot” primary datasheeet 14 from the load windings. 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.

xatasheet Sampling of any of the other load circuit supply voltages could also be done. 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 great a degree of electrical isolation. The voltage represented by the spike datzsheet FIG. The conduction time of the transistor switch is controlled in order to regulate the magnitude of the voltages induced across the load circuit windings.


AN Datasheet pdf – Switching Regulator Control Circuit – Matsushita Electric Works(Nais)

In accordance with the present invention, a regulated power supply for a television receiver which includes a number of load circuits comprises an unregulated voltage source coupled to a first terminal of a primary transformer winding.

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.

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. Inductive energy is stored in winding 14 and in the magnetically permeable core of transformer Additional receiver circuits may be subject to excessive electrical stresses or may be damaged if supply voltages are not held within acceptable limits.

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. To prevent a degradation of the voltage regulating capabilities of the receiver under these conditions, a supplemental winding 41 of transformer 14 is provided and operates in the following manner.

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. Resisting the tide of post-modernity may be difficult, but I will attempt it anyway. 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.

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. In the accompanying drawing, FIG. Sampling of the volt supply is shown for example only.

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.

Pretty soon it will all turn to dust!

This permits windings 14 and 41 to be layer-wound as previously described in order to provide tight magnetic coupling yet allows windings 14 and 41 to be electrically isolated through the use, for example, of 20 mils of Mylar between windings 14 and