| 摘要 |
PURPOSE:To eliminate contacts of the switch part of a degaussing circuit and to reduce the cost of the switch part greatly by connecting a posistor, degaussing coil, and triac in series between a power supply path and the ground. CONSTITUTION:One terminal of the serial circuit of the posistor 4 and demagnetizing coil 5 is connected to the current supply path 2 and the triac 20 is connected to the other terminal. The gate of the triac 20 is triggered by the voltage obtained by rectifying and smoothing pulses from the teriary winding of a flyback transformer 21. When a power source switch 8 is turned on at this time, the terminal voltage across a capacitor 24 rises excessively and the triac 20 turns on possibly in its rising; a means 25 of supplying a trigger to the gate of the triac 20 after the potential at a point A rises up to a specific value is provided for the prevention. |
