دارات الخرج الأفقي الترانزستورية .. كتاب التلفزيون الملون والعادي

9-17 Horizontal Transistor Output Circuits:

The resistance of the total horizontal deflection coils in the transistor device is less than ohms, which is the ohmic comparison (DC), while it is usually of

(5 to 30 ohms) in the valvular system. And since the horizontal scanning frequency is (15625) Hz, the inductive resistance of the coils is very large compared to its ohmic resistance. Since the voltage of the wave is pulsed in the transistor type, the coil driving circuit must be of ohmic resistance A - and the transistor is the typical element to provide a small resistance and a rectangular pulse wave, and the process of cutting and connecting 15625 times per second, and this is not possible with a mechanical cutter, so the transistor has a large capacity and a high speed Its resistance in saturation is less than 1 ohm. In the case of cutting, its ohmic resistance is higher than (50,000) ohms. This resistance in connection and disconnection makes the transistor a good amplifier for the horizontal output (Fig. (11-17).

Solid state dampers:

Although a saturated transistor can carry current in both directions, it cannot reverse the current direction fast enough in time (13) Figure (17-14) and at this moment the oscillation is stopped by the small parallel resistance of the transistor's resistance and the bi-qubit, which is now effectively parallel - The potential (current) in the deflection coils begins to run out and decay linearly towards zero and during most of the binary. In Figure (13-17) we find that the diode is connected between the emitter and the collector of the transistor, as this diode conducts the current at the moment of the recoil period and thus praises the self-oscillation of the circuit. It's called a bi-damping - based transistor

Also, a part of this current was collected, but at a relatively late time due to the high starting resistance in it, which is more than the resistance of the damping binary (cappet).

Potentiometer + B

The transistor circuit differs from the valve in this task, as the rectifier diode in the circuit of solid elements is not considered a source of voltage enhancement + B. It is only used to carry most of the current deflection coils when the electron beam is in the screen section. And when there is a need for an enhanced voltage + B, a separate diode is used.

Nonlinear Scan Compensation:

Since the horizontal output transistor circuit has a resistance of less than (1 ohm) in direct current DC, this small resistance is sufficient to create a nonlinear scan, it causes the left part of the screen to stretch and the right part to compress - and to compensate for that nonlinear appearance a capacitor is used in series with deviation. As in Figure (17-14), a voltage wave shaped like a letter is generated on the capacitor and during scanning... This compensates for the distortion that occurs to the left and right of the screen in terms of expansion and compression in the image. This capacitor may be called capacitor (5). This capacitor also reserves the direct current from reaching the deflection coils. It works to raise its temperature. Its ohmic resistance increases and causes an increase in non-linearity.

high voltage circuits:

As in the simplified figure (17-14), the primary horizontal output transformer files are connected on a full-time basis with dual damping - a transistor and deflection files. The high voltage coils generate pulses ranging between (10-30 kV) and are applied to the second elevator of the screen. The high voltage rectifiers are of the silicon type. As in Figure (17-15).