Horizontal deflection circuit for electron beam - is based on pumping transistor principle and has charging capacitor in deflection circuit

摘要

Current from a d.c. voltage source is fed through a pumping transistor to the deflection circuit line fly-back. A supply winding of a line transformer is in series with the collector-emitter path of the pumping transistor and with a resistor connected to the d.c. voltage source. A Zener diode and a control winding of the line transformer are connected to the pumping transistor base. A charging capacitor is in the deflection circuit proper, and serves as a voltage source for connected loads. A resistor (24) is inserted between the pumping transistor (17) base and the d.c. voltage source (14) terminal (15) connected to the supply winding (1), so that, when the d.c. voltage is switched on, the pumping transistor (17) receives a starting control voltage. A diode (25) in forward direction for this current is between transistor (17) base and control winding (2). It limits the starting control voltage for transistor (17).