Deflection oscillators

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Presentation transcript:

Deflection oscillators Television 1 Jess Role @ UEAB2006

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 Television 1 Jess Role @ UEAB2006

Trapezoid Generator Television 1 Jess Role @ UEAB2006

Television 1 Jess Role @ UEAB2006

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. Television 1 Jess Role @ UEAB2006

Transistor Blocking oscillator with its associated waveforms Television 1 Jess Role @ UEAB2006

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 Television 1 Jess Role @ UEAB2006

Television 1 Jess Role @ UEAB2006

Collector Coupled multivibrator Television 1 Jess Role @ UEAB2006

Television 1 Jess Role @ UEAB2006