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Deflection oscillators

Learn the purpose and important characteristics of oscillators in generating sawtooth/trapezoid waveforms for TV tubes and amplifiers. Explore how amplitude, linearity, and frequency impact the picture quality according to FCC rules. Understand various types of oscillators like blocking, multivibrator, and IC oscillators in television circuits.

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Deflection oscillators

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  1. Deflection oscillators

  2. Purpose of oscillator • To generate sawtooth trapezoid of sufficient amplitude to drive the output • Support the amplitude amplifier • Provides pulses necessary to drive a discharge transistor

  3. Trapezoid Generator

  4. Sawtooth deflection current important characteristics that affect the television picture tube • Amplitude – depends on the time constant of the RC network and the source Voltage (possibly at 20V) • Linearity – can be affected by the constant of the circuit and the total time the capacitor allowed to charge. • Frequency horizontal and vertical sawteeth FCC rules: Black and white at 60 Hz and 59.94 for color.

  5. Transistor Blocking oscillator with its associated waveforms

  6. Common television oscillator in the vertical and horizontal circuit • The blocking oscillator – self activated switch that is closed for a short time, allowing the sawtooth capacitor to charge then it will be open for a long time for trace, permitting capacitor to discharge. • The multivibrator – used in solid state emitter coupled circuits • The overdiriven Hartley oscillator • The IC oscillator

  7. Collector Coupled multivibrator

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