Horizontal circuitry for television receivers

Claim 1

In a television receiver including horizontal sweep and high voltage circuitry and an automatic frequency control circuit, wherein said automatic frequency control circuit is adapted to receive incoming horizontal synchronization signals and a portion of the horizontal sweep signals and is operative to provide an output correction signal whenever said horizontal synchronization signals differ from said horizontal sweep signals in phase or frequency, improved horizontal oscillator and drive circuitry comprising: an input terminal adapted to receive correction signals from said automatic frequency control circuit; first, second and third transistors each having base, emitter and collector electrodes; means connecting said input terminal to the base electrodes of said first and second transistors; a source of energizing potential; means connecting the collector electrodes of said first and second transistors to said source of energizing potential; first and second capacitors connected between the collector electrodes of said first and second transistors and the base electrodes of said second and first transistors respectively; means connecting the emitter electrode of said second transistor directly to the base electrode of said third transistor; means connecting the emitter electrodes of said first and third transistors to a point of reference potential; a load connected between the collector electrode of said third transistor and said source of energizing potential; and means coupling said load to said high voltage and sweep circuitry; feedback means connected between the base electrodes of said second and third transistors.