| 摘要 |
<p>PURPOSE:To facilitate an easy head leading of a tape, by installing the circuit which detects the intra-data part signal out of the recorded tape and then gives an alarm in the tones varied according to the presence or absence of the intra-data part signal plus the control circuit which stops the tape driving motor for a fixed time by the intra-data signal. CONSTITUTION:In the head leading mode, the driving voltage is always supplied to the alarm oscillation circuit 23. The multivibrator AM2' of a long cycle gives a connection or nonconnection to the resistance R0 via the transistors Q2' and Q2'' which are turned on and off according to the presence of the head leading detection signal, and thus gives the cycle as shown by the parts (a) and (b). With this output, a switching is given to the multivibrator AM1' of a short cycle. As a result, the oscillation output is transmitted from the speaker via the power amplifier.</p> |
