1. Deflection oscillators
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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
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3. Trapezoid Generator
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5. 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 for color.
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6. Transistor Blocking oscillator with its associated waveforms
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7. 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
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9. Collector Coupled multivibrator
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