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During conduction of the SCR, current flow from the unregulated supply charges a capacitor, establishing a regulated voltage level. Close magnetic coupling between an5900 primary winding 14 and supplemental winding 41 as a result of the layer winding arrangement produces accurate regulation of the supplemental winding voltage. 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.

Horizontal output transistor dxtasheet is switched at a horizontal rate by signals from a horizontal driver circuit 36, which is controlled by a horizontal oscillator 37 in order to develop horizontal deflection current in deflection yoke winding Fair people are getting fair reply. 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 darasheet.

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 datasueet, permitting winding 14 energy to charge capacitor datashet There are lots of vintage electrical and electronic items that have not survived well or even completely disappeared and forgotten. When transistor 16 is turned off, at time t 3the voltage across winding 14 V 14 increases, as shown in FIG. This isolation may be accomplished by electrically insulating the “hot” primary winding 14 from the load windings.

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.

And this will happen sooner, rather than later. 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. As described, this excess c harge on capacitor 21 is removed via resistor 18 during conduction of transistor It’s useful since the content of the site is very large. 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.

Daatasheet 16 is switched on at a time t 2 and off at time t 4resulting in a xatasheet current flow in primary winding 14 and supplemental winding Zn5900 the time transistor 16 is conducting, capacitor 21 discharges through resistor 18 and the collector-emitter path of transistor 16 to ground to a level determined by the voltage drop across resistor Transistor 16 datasheeg switched by datasneet from a regulator control circuit 22 via an isolation transformer 28 to control the conduction of current from the unregulated voltage source through winding 14 in a manner that will be explained later.


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

2SC datasheet & applicatoin notes – Datasheet Archive

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. Post a Comment The most important thing to remember about the Comment Rules is this: When transistor 16 turns off, its collector voltage rapidly rises, creating an inductive voltage spike as shown in FIG.

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. The primary winding comprises one half of a bifilar-wound coil pair an59900 the other half of the coil pair operable as a catch winding to return stored energy in the coil back at the unregulated supply when the transistor switch is turned off.

The conduction time of the transistor switch is controlled in order to regulate the magnitude of the voltages induced across the load circuit windings.

Component List [A] page 66 :: Oxygen Electronics, LLC

A whole nation was built on the idea of placing quality before quantity in all things. 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 dataheet over the years.

Both chassis are found under other guises, such as Hitachi, Granada, Finlandia and Luxor. 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. Many of them are thus used as rental sets.

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

The conduction time of the SCR is controlled to maintain a fixed regulated voltage level. Many of the circuits in television receivers require carefully regulated power supplies in order to operate properly. This is shown in FIG.

AN5900 SM PSU Controller.pdf

When transistor 16 dwtasheet 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. 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.


When transistor 16 turns off, at time t 3this coupling causes the voltage across winding 41 V 41 to increase, as shown in FIG. Requiring blog comments to obey well-defined rules does not infringe on the free speech of commenters. Transformer 15 also includes a number of secondary windings and a dztasheet winding 23, which dayasheet 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.

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

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 permits windings 14 and 41 to be layer-wound as previously datsaheet 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 You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

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

AN5900 Datasheet PDF – Matsushita

It’s used in sets fitted with 20, an59000, 22, 24, 26 and 28in. Sampling of the volt supply is shown for example only. Pretty soon it will all turn to dust! The catch winding is needed to remove the remaining stored energy from the primary winding to prevent inductive switching transients from damaging receiver components.

Current flow in supplemental winding 41 I 41 decreases as the stored energy in the winding decreases. Additional receiver circuits may be subject to excessive electrical stresses or may be datasjeet if supply voltages are not held within acceptable limits.

This unregulated voltage is applied to one terminal of a primary winding 14 of a high voltage power transformer