| 摘要 |
PURPOSE:To easily display signal level of two channels on a magnetic recording and reproducing device by providing LEDs for the 1st and the 2nd channels, a channel signal supply circuit, a channel selection switch, a common display driving circuit, etc. CONSTITUTION:The signals of the channels L and R are inputted alternately to the common display driving circuit consisting of NOR circuits and NAND circuits connected to one-side terminals of LEDs L1-L12 and R1-R12 for the 1st and the 2nd channels L and R. In this case, the 1st light-emission changeover switch which consists of a transistor TRQL and an inverter 19 turns on while the signal of the channel L is inputted to the display driving circuit to drive the LEDs L1-L12, but the 2nd light-emission changeover switch consisting of a TRQR is held off. Therefore, the common display driving circuit displays the signal levels of the 1st and the 2nd channels. |
