| 摘要 |
In a line deflection circuit a trace capacitor (C2), a linearity control inductor (L3) and associated parallel resistor (R1), a pre-set width control inductor (L1) and associated parallel resistor (R2), and a line deflection coil (Ly) are connected in series across the terminals of a controlled switch formed by the emitter and collector electrodes of a transistor (TR). A flyback capacitor (C3) is also connected across the above electrodes of the transistor (TR). A series efficiency flyback boosting circuit comprising the transistor (TR), the primary winding (P) of a transformer (T), a boost capacitor (C1) and a diode (D1) is used to energise the deflection circuit. The transformer (T) has an EHT secondary winding (S) which with a diode (D2) provides an EHT supply for the final anode of a display tube (not shown). A further pre-set inductor (L2) is connected between the lower terminal of the secondary winding (S) and earth, the adjustment means for inductor (L2) being ganged with that for width control inductor (L1) and arranged so that as the inductance of one increases the inductance of the other also increases. |
