![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDU8aKte4KR8VbLkkRlxMcr8-mci7-93VkwxuKcAcyAm0RugGHs0kHO_F3yB4jAISew2QT7fiT167AH6WqGwngxPehfizj9ifJihXsTGTtELk174IoAHUriybPA_3U5gTRHIgiM8PDT5e4/s320/IMG_5815.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiizDk0cJaUDCpNM1fI39bcsd1NNXehRGjXA8W2PvKqoKISgNXgUvyBFXTWqHV5TMZRbg7eXF5PoAOdzl8v-7bihiXHVHgfqwLhYgpn2dwkk8PBSgImqGoHJbxpVncVCAKdVL1YFaP9gkdp/s320/IMG_5816.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_F0HIGUTDnhY4W6qyBVVRI0AaKezgAFjMovUofdescMa_uluYeBuGpvB8HJVB2GfdXHoLxkMA2tOyMmA_r5DLsUSXXA9nEwh4T65O_YCdYPwSgnC2HaXXsODtEY2j4j3jPPSYRGDhIaEn/s320/IMG_5822.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizFibG8Hvwir0mc_iXlX_jhWZoG0uwP_4YcDl-YAfMoRkmsuDqeNdHe1nkLR0sViLP3F5ohkrxwz2r-VVF7G4zfp-eNukluEP9niqgYk5U2AermVrhhFnVNCW6qZrEIPXGiLehYGpjIHMT/s320/IMG_5817.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmORaY4VlwpNOeO-9rwJOhbAb0iJs3VeFweFfRekG_hX-kkGBYwVKA9mBWxbxElK3ex_vLL2D31wrrIY2ujAPSTgRgHpmMpluEuEu4LLRYwYHMSfOUxXUPk0s_iC0ABxG3OQ-bSzyErCLh/s320/IMG_5819.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7zRlwZ_UbJDtGgKrTeDAg_l6mOfHtQlOydX0mP2-EUi7Z8kwt_VC8BuhSKB6-QrOl3M-EcENz15hhyk6Qo-ysxzThz-UIf7qRGzsC_OTQtrBdxj9w1hxe3HvQJL1ErwAMdHFsGtDIPOc2/s320/IMG_5818.jpg)
The tubes used are:
- PL500
- PY88
- DY87
- PCL85
- EF183
- PCF200
- PCL84
- PL84
- PCL86
- PCH200
- PCF802
NOTE:
- The speaker is a high impedance type for TUBES output stage transformerless .
Approx 600 OHM.
- The mechanic tuning unit.
PHILIPS I 24T700/00 CHASSIS PS601.69.0 CIRCUIT ARRANGEMENT FOR PRODUCING A SAWTOOTH CURRENT ACROSS THE VERTICAL DEFLECTION COIL OF A TELEVISION RECEIVER, Philips Tubes vertical deflection
A circuit for introducing adjustable parabolic and S-components in a sawtooth curr
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLSoRTmGNf9uMAl2Zt774MzOxNJqQfUV7sKtTxHPuNjY9tvMFWVeblT_SGWPLT8b3EiFt16CrZvlqXw3GhlCNJXhynFNb9oLnfqdOeojaihuZscwBDhokAv0X6_bmSR86OkYsw-07QCTo/s320/PHILIPS-TUBES-FRAME-DEFL-1.jpg)
The invention relates to a circuit arrangement for producing a sawtooth current across the vertical deflection coil of a television receiver. The coil is included in the output circuit of the vertical output stage, to the control-electrode of which is applied the sawtooth con-trol-signal which is developed across a charging capacitor included in the control-electrode circuit. The charging capacitor is periodically discharged and is recharged with the aid of a charging circuit which includes the se-ries combination of a resistor and a winding, lying outside the discharging circuit. The winding is magnetically cou-pled with a choke included in the output circuit of the 50 vertical output stage, through which winding a voltage is induced, which is opposite the capacitor voltage. Said winding has connected with it in parallel the series corn-bination of at least one resistor and one reservoir capaci-tor, the free end of the latter being connected to the Jun
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizFibG8Hvwir0mc_iXlX_jhWZoG0uwP_4YcDl-YAfMoRkmsuDqeNdHe1nkLR0sViLP3F5ohkrxwz2r-VVF7G4zfp-eNukluEP9niqgYk5U2AermVrhhFnVNCW6qZrEIPXGiLehYGpjIHMT/s320/IMG_5817.jpg)
3,426,243 Patented Feb. 4, 1969
coil, behaving substantially like a resistor, but also an in-ductor is included in the output circuit of the vertical final stage. The S-component is required in view of the fact that the display screen of the display tube in a television re-ceiver is flat. Therefore, the rate of deflection of the electron beam must be higher at the centre of the screen than at the edge in order to achieve a linear displacement of the spot on the display screen. The S indicates sym-bolically what form the current through the deflection coil must be for obtaining these desired deflection rates. Numerous circuit arrangements are known by which the desired current form can be produced. However, they have the disadvantage that they are either too compli-cated or are not capable of providing the correct ratio between the sawtooth, parabola and S-component. The circuit arrangement according to the invention is, on the contrary, simple and provides, in addition, the possibility of adjusting accurately the desired ratio between saw-tooth, parabola and S-component, while it prevents, in addition, an excessive influence of undesirable higher de-gree components in the produced current. In order to produce the parabola and S-component, and permit adjustment of their amplitudes, the circuit arrangement according to the invention is characterized in that in parallel with the reservoir capacitor there is con-nected an integrating network which consists of the series combination of an integrating capacitor and an integrating resistor, the free end of the latter being coupled with the junction of the charging capacitor and of the reservoir capacitor. The junction of the integrating resistor and the integrating capacitor is connected to the control-electrode of the output stage. The end of the charg
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizFibG8Hvwir0mc_iXlX_jhWZoG0uwP_4YcDl-YAfMoRkmsuDqeNdHe1nkLR0sViLP3F5ohkrxwz2r-VVF7G4zfp-eNukluEP9niqgYk5U2AermVrhhFnVNCW6qZrEIPXGiLehYGpjIHMT/s320/IMG_5817.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLSoRTmGNf9uMAl2Zt774MzOxNJqQfUV7sKtTxHPuNjY9tvMFWVeblT_SGWPLT8b3EiFt16CrZvlqXw3GhlCNJXhynFNb9oLnfqdOeojaihuZscwBDhokAv0X6_bmSR86OkYsw-07QCTo/s320/PHILIPS-TUBES-FRAME-DEFL-1.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDU8aKte4KR8VbLkkRlxMcr8-mci7-93VkwxuKcAcyAm0RugGHs0kHO_F3yB4jAISew2QT7fiT167AH6WqGwngxPehfizj9ifJihXsTGTtELk174IoAHUriybPA_3U5gTRHIgiM8PDT5e4/s320/IMG_5815.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEizFibG8Hvwir0mc_iXlX_jhWZoG0uwP_4YcDl-YAfMoRkmsuDqeNdHe1nkLR0sViLP3F5ohkrxwz2r-VVF7G4zfp-eNukluEP9niqgYk5U2AermVrhhFnVNCW6qZrEIPXGiLehYGpjIHMT/s320/IMG_5817.jpg)
The greater the time constants R20C19 and R22C19 are 70 chosen, the small become the values of Pi and 132. Since, moreover, the denominator increases with an increas-ing degree in t (for t4 the denominator is 24 and for /3 it is already 120), the fourth and higher degree terms in Equation 5 can be neglected with respect to the first, 75 second and third degree terms with a correct choice of the resistors R20 and R22 and of the capacitor 19.
This signal contains, in principle, all the desired correction terms, since it contains not only the linear term, i.e. the sawtooth component (a—b)t but also the posi-tive quadratic term, i.e. the required parabolic component and a negative third-degree term, i.e. the component re-quired for the S-correction. This S- or third-degree com-ponent must, in fact, be negative, since with respect to 15 the flat display screen of the display tube the rate of scanning must be reduced both at the beginning and at the end of the stroke. This means a third-degree term must be subtracted from the linear term.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLSoRTmGNf9uMAl2Zt774MzOxNJqQfUV7sKtTxHPuNjY9tvMFWVeblT_SGWPLT8b3EiFt16CrZvlqXw3GhlCNJXhynFNb9oLnfqdOeojaihuZscwBDhokAv0X6_bmSR86OkYsw-07QCTo/s320/PHILIPS-TUBES-FRAME-DEFL-1.jpg)
In the known circuit arrangements of Patent No. 2,851,632 the part of the arrangement for the production of the sawtooth and cor-rection voltages comprises four capacitors and five resis-tors. In the arrangement according to the invention five capacitors and six resistors are required. In principle, we are concerned with a different arrangement of a substan-tially equal number of parts, the values of which have to be chosen carefully or which have to be variable. In the foregoing the fact is left out of consideration that the voltage V15 obtained from the winding 7 contains not only a linear term —bt but also second- and third-degree components, since the anode current i a, which induces a voltage in the winding 7, contains second- and third-degree terms. However, if the value of p, is chosen correctly, it can be said that the influence of the third- and fourth-degree terms in vo,tage V15 with respect to the linear term is negligible. An exact calculation can, of course, be made, in which all factors also the negative feedback through the winding 7 are considered. The formulae then obtained are, however, so compli-cated that it is difficult to make conclusions therefrom. In the explanation given above, it is therefore preferred to use an approximate calculation, which has the advantage of providing a good insight in the operation of the circuit arrangement. So far the function of the triode 23 has been left out of consideration, since it is not connected with the prin-ciple of the invention. This triode only serves for a periodi-cal discharge of the capacitor 8. To this end the signal derived from the output transformer 2 is applied through a further secondary winding 24 and various capacitors and resistors to the control-grid of the valve 23. The signal derived from the winding 24 has the same waveform as the signal 13 and ensures that during the fly-back the triode 23 gets into the conducting state, so that the capac-itor 8 is discharged. The terminals 24' and 25 receive frame synchronising pulses which provide a direct syn-chronisation of the valve 23. It appears therefrom that the oscillator circuit formed by the valves 1. and 23 is of the so-called trnultivibrator type, in which, however, the feed-back of the anode of the valve 1 to the control grid of the valve 23 is performed through the output transformer 2. It will be obvious, however, that any other control-method for valve 23 may be employed. The valve 23 may be formed by a blocking oscillator, so that this valve in itself is included in an independent oscillator circuit which provides a periodical discharge of the capacitor 8. The advantage of the arrangement of FIG. I is however, that a separate blocking transformer is economised, whilst only the winding 24 suffices for obtaining a self-oscillating circuit. It is neither strictly necessary for the deflection coil 4 to be connected through the winding 3 of the transformer 2 to the anode of the valve 1. When the impedance of the de-flection coil 4 allows so, it may be connected through a capacitor cutting off the direct current to the anode of the valve 1. In this case the primary winding of the trans-former 2 can be considered to be a choke with which the secondary winding 7 is magnetically coupled. The wind-ing 24 may, if desired, also be coupled with said choke, if a transformer arrangement of the multivibrator type is desired, or the winding 24 may be omitted, and the valve 23 may be formed by a blocking oscillator. Particularly, if transistors are used instead of valves, it is common practice to couple the vertical deflection coil 4 directly with the collector electrode of the output transistor.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLSoRTmGNf9uMAl2Zt774MzOxNJqQfUV7sKtTxHPuNjY9tvMFWVeblT_SGWPLT8b3EiFt16CrZvlqXw3GhlCNJXhynFNb9oLnfqdOeojaihuZscwBDhokAv0X6_bmSR86OkYsw-07QCTo/s320/PHILIPS-TUBES-FRAME-DEFL-1.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLSoRTmGNf9uMAl2Zt774MzOxNJqQfUV7sKtTxHPuNjY9tvMFWVeblT_SGWPLT8b3EiFt16CrZvlqXw3GhlCNJXhynFNb9oLnfqdOeojaihuZscwBDhokAv0X6_bmSR86OkYsw-07QCTo/s320/PHILIPS-TUBES-FRAME-DEFL-1.jpg)
No comments:
Post a Comment
The most important thing to remember about the Comment Rules is this:
The determination of whether any comment is in compliance is at the sole discretion of this blog’s owner.
Comments on this blog may be blocked or deleted at any time.
Fair people are getting fair reply. Spam and useless crap and filthy comments / scrapers / observations goes all directly to My Private HELL without even appearing in public !!!
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.
Your choice.........Live or DIE.
That indeed is where your liberty lies.
Note: Only a member of this blog may post a comment.