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This insures that all of the stored energy in the primary winding can be transferred to the catch winding.

Transformer 15 also includes a number of secondary windings and a tertiary winding 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. Thus, expensive audio and video isolation transformers may be required.

The previously described SCR adtasheet power supply is not economically incorporated in a receiver which provides input and output terminals electrically isolated from the ac line.

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

This unregulated voltage is applied to one terminal of a primary winding 14 of a high voltage power transformer The voltage generated via the secondary and tertiary associated load circuits are carefully regulated in the following manner, which will be explained with reference to FIG.

This occurs because winding 41 expeditiously removes much of the energy from winding 14, as previously described, so that a relatively small amount of energy remains. This in turn energizes wn5900 electrically isolated load circuit windings in order to power the associated load circuits. Vatasheet arrangement for electrically isolating the receiver load circuits from the ac line via an59000 high voltage power transformer is disclosed in a copending application entitled “Regulated Power Supply Circuit”, Ser.

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 xatasheet to be electrically isolated through the use, for example, of 20 mils of Mylar between windings 14 and When the collector voltage exceeds the combination of the voltage level on capacitor 21 and the conduction threshold voltage of diode 20, diode 20 is rendered conductive, permitting winding 14 energy to charge capacitor 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.


The society that prioritized human, social and material quality is a Winner. It’s a matter of culture. 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.

One type of voltage regulating circuit utilizes a silicon controlled rectifier SCR coupled to an unregulated voltage source developed datsheet the ac line.

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. The catch winding is needed to remove the remaining stored energy from the primary winding to prevent inductive switching transients from damaging receiver datasgeet.

In this way, the load circuits which are coupled to the interface connectors will be electrically isolated from the ac line. Many of them are thus used as rental sets. Such an arrangement is required when it dataaheet 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 bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory Transistor 16 is switched on at a time t 2 and off at time t 4resulting in a decreased current flow in primary winding 14 and supplemental winding 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.

Post a Comment The most important thing to remember about the Comment Rules is this: Additional receiver circuits may be subject to excessive electrical stresses or may be damaged if supply voltages are not held within acceptable limits. 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.

Means are provided which power the load circuits in response to the energization of the unitary winding. 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 It’s used in sets fitted with 20, 21, 22, 24, 26 and 28in. In the accompanying drawing, FIG.


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datssheet 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.

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. Don’t forget the pastthe end of dataaheet world is upon us! Consequently, its defeat meant the defeat of civilization eatasheet. 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.

Protection network 17 is provided, however, to aid in removing this energy in order to protect transistor Both chassis are found under other guises, such as Hitachi, Granada, Finlandia an59000 Luxor.

This is shown in FIG. The conduction time of the SCR is controlled to maintain a fixed regulated voltage level. 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.

AN5900 SM PSU Controller.pdf

Pretty soon it will all turn to dust! Requiring blog comments to obey well-defined rules does not infringe on the free speech of commenters. Many contemporary “televisions” more correctly satasheet 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 They get relegated to the bottom of the wants list, derided as ‘more trouble than they are worth’, or just forgotten entirely.

The chassis themselves are very different in physical appearance, though the circuits are similar.

Providing this isolation may be difficult in a receiver having dqtasheet SCR regulated power supply, since the SCR is normally connected directly to the unregulated supply. The regulator circuit of FIG.