| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple circuit in which an image amplitude is not fluctuated in the case of fluctuation of voice output in a power supply circuit using a transformer. SOLUTION: In this circuit, a negative feedback circuit consisting of a voltage feedback capacitor 28 and a current limit resistor 29 connected in series is connected between a connecting point (a) between a coil 18 and diodes 13, 14 forming a diode modulator circuit connecting to a secondary +B1 output line of a transformer 1 via a flyback transformer(FBT) 11 and a connecting point b among a base of a transistor(TR) 19 receiving a pin cushion (EW) input signal and base bias resistors 20, 21. the fluctuation in the image amplitude based on sound fluctuation is prevented by applying negative feedback to the TR 19 being an amplifier for the pin cushion (EW) input signal. |
