Fly back transformer

A fly back transformer for providing a DC high voltage and at least one focusing voltage to a CRT in a TV set or monitor, comprising:

• a horizontal output section for receiving horizontal synchronous pulse and generating sawtooth wave;
• a low-voltage bobbin having a low-voltage wire wound around the outside surface thereof to form a first coil;
• a high-voltage bobbin having a plurality of high-voltage wires wound for plural times interposing insulating films around said high-voltage bobbin to form a second coil having a number of high-voltage coil layers and a plurality of high-voltage rectifier diodes each connected in series between each of plural upper terminal pins and each of plural lower terminal pins;
• a focusing pack having a PCB internally mounted thereto by molding insulating resin, said PCB being printed with an adjustable resistor to adjust the at least one focusing voltage, and a focus input terminal for receiving the focusing voltage;
• a bleeder resistor detachably fixed in position to said high-voltage bobbin, and having an upper end inserted into an inserting member in an upper side of said high-voltage bobbin and a lower end inserted into a settling member in a lower side of said high-voltage bobbin, said upper end being electrically connected with one of said upper terminal pins corresponding to a high-voltage terminal and said lower end being electrically connected with said focus input terminal;
• and
• a focus-drawing wire disposed between the first one of said high-voltage coil layers and the last one of said high-voltage coil layers, and having one end connected with one of said upper terminal pins to draw a voltage generated between the high voltage terminal and a low-voltage terminal of said high-voltage bobbin and the other end connected with said lower end of the bleeder resistor.