مرحلة الخرج الأفقي npn ونوع pnp .. كتاب التلفزيون الملون والعادي

10-17 Horizontal output stage NPN and PNP type:

Figure (16-17) shows a typical circuit of the NPN type - for a monochromatic device, the horizontal deflection coils are connected to each other in parallel, while they are connected in series with a capacitor (C) S), which consists of two parallel capacitors 16 and 17 C, the deflection coils and the capacitor C connected directly on The primary coils of the horizontal output transformer - however, the operating waveform coming from the transistor must pass the filter, before it reaches the deflection coils and the transformer. The collector pulses of the transistor rise to a maximum of 500 volts during the bounce time. It performs a diode (601 SR) and filters capacitors (23-27), producing a continuous DC voltage (500) volts, which is used in the screen valve for the focus electrode. via .

Horizontal output stage PNP type: Figure (17-17) shows the horizontal output circuit with a PNP transistor - for an AC device or a battery. The 2D diode is a damping diode, connected directly between the collector and emitter of the output transistor - and as usual another 1D diode insures the boost voltage (80) (V). While the voltage + B of the device on the battery is 13 volts. The base and the emitter have the same DC voltage difference - and with a low resistance of the connecting transformer secondary between them - and this secures its operation in Class C, and thus the transistor until the pulse reaches through the transformer. The high-voltage pulses from the horizontal output transformer conduct a solid-state diode D3 - giving a voltage of 8 kV to be used for the second anode of the small gauge screen valve.

Transistor circuit controls in horizontal deviation: These include:

1- Width controls, either by connecting or separating a special capacitor between the horizontal output and the ground of the device. The second method is with a variable induction file, the deflection files in sequence, as shown in the figure

(17-18) and (17-19)

2- Linearity Controls There are no linearity controls in transistor devices with solid elements, because they are not necessary, given that the nature of transistor circuits is linear in itself.