Horizontal line scan stage - has modulation voltage controlled by regulating stage for picture width control

摘要

The horizontal line scan deflection stage for use in a television receiver has a switching transistor (TS), horizontal transformer (HT), capacitors (CT,C2) deflection coil (LA) and bridge coil (LM). The diode modulator used with this circuit has a pair of diodes (D1, D2) and a pair of capacitors (CR1,CR2) coupled to the deflection coil and the bridge coil. The modulation voltagea (VM) is regulated to control the amplitude of the deflection current to maintain the width of the picture. A regulating input voltage (VS) is compared with a control voltage (VR) to regulate the modulation voltage. ADVANTAGE - Accurate control of horizontal width.