| 摘要 |
PURPOSE:To cut off unnecessary whole biases at the L-channel side by means of a relay by using conventional parts effectively and without changing the parts, by separating a bias supplying circuit to a sound-recorded reproducing head into 2 systems and simultaneously switching biases to the reproducing side and to L-channel audio erase. CONSTITUTION:1 of the figure is a bias oscillating block which supplies biases to a 4-LChAE, 5-RChAE, 6-FE head, and sound-recorded reproducing heads 9 and 10. The bias is supplied to the 4-LChAE and 9-LCh sound-recorded reproducing head through a 2-AE head switching relay. Therefore, when the relay is switched, the bias to an L-channel PB amplifier 7 is completely cut off. |
