| 摘要 |
<p>PURPOSE:To prevent accidental erasure of a sound-recorded signal by inhibiting the timer sound recording when a tape recorder is stopped attended with the end of reciprocating operation when the timer sound recording is used. CONSTITUTION:When the sound recording in the 2nd direction is applied and a magnetic tape runs to its end, an automatic stop circuit 13 is operated and a signal of an H level is outputted at an output terminal 14 for a short time, an inverting transistor (TR) 30 is biased to be conductive to invert an inverting circuit 21 and a signal at a Q output terminal 26 goes from an H level to an L level. Since a power from a battery 16 is fed to the inverting circuit 21 even when power supply is intermitted, the inverting circuit 21 is held at the inverted state. When power is supplied again from a timer device, a switching TR 40 is conducted and a bias current is fed to the base of a switching TR 37, but since the control TR 45 is nonconductive, no switching signal is inputted to a sound recording input terminal 6 and a reproducing input terminal 7 of the operation circuit 5.</p> |
