| 摘要 |
PURPOSE:To obtain an easy to see pattern by eliminating rattling noise sound due to vibration of a cabinet or a cathode ray tube and of vibration of a shadow mask caused by an audio output even when the audio output is very large. CONSTITUTION:The circuit is provided with diodes 25, 26 used to detect a DC voltage proportional to the sound output level and the voltage is divided to provide a base current to a negative feedback transistor(TR) 30 and a collector current in response to a current amplification factor of the TR 30 is negatively fed back to a bus control terminal 10 of a sound volume sound quality control circuit 3. |
