Abstract: A tape end warning apparatus comprises an alarm switch which is closed in response to the detection of a terminal end of a running tape being reached during a record or playback operation of a tape recorder, and an oscillator circuit which is activated by the closure of the switch. The oscillator circuit produces an alarm signal which is fed to an amplifier inherently contained in a tape recorder so as to give off an audible alarm through a loudspeaker which is connected with the amplifier.

Abstract: A tape end alarm is provided for a tape recorder which includes a changeover switch for selectively connecting an amplifier with a microphone during a record mode and with a magnetic head during a playback mode. The alarm comprises an alarm oscillator which is connected with the amplifier through the changeover switch during a record mode, and an alarm switch adapted to be closed in response to the detection of the end of a running tape being reached for activating the alarm oscillator. In this manner, an alarm is produced only during a record mode when the end of a running tape is reached.

Abstract: Rotational speed of a flywheel directly coupled with a capstan is detected by a speed detector. The rotational speed data and the reference speed data are supplied to a comparator/arithmetic circuit whereby actual tape running speed relative to the reference speed is calculated. Data outputted from the comparator/arithmetic circuit is supplied to a display device whereby relative value of the actual tape speed with reference to the reference speed is displayed.

Abstract: A tape recorder apparatus comprising a tape drive circuit, an audio circuit, a record-reproduction changeover switch, a fast forward-rewind changeover switch, and a scan converter. The scan converter receives a forward-run signal or a backward-run signal when the record-reproduction change-over switch or the fast forward-rewind changeover switch is operated. Upon receipt of such a signal the scan converter generates a forward scan signal or a backward scan signal. The tape recorder apparatus is further provided with a display device which displays in response to a scan signal from the scan converter a numeral, e.g. 0, shifted sequentially from the lowest digit position to the highest digit position or vice versa. The direction in which 0 is shiftingly displayed is the very direction in which the tape is running.

Abstract: A tape end warning apparatus comprises an alarm switch which is closed in response to the detection of a terminal end of a running tape being reached during a record or playback operation of a tape recorder, and an oscillator circuit which is activated by the closure of the switch. The oscillator circuit produces an alarm signal which is fed to an amplifier inherently contained in a tape recorder so as to give off an audible alarm through a loudspeaker which is connected with the amplifier.

Abstract: A tape recorder with display function comprises a tape recorder unit, a power source terminal connected to a power source for supplying power to the tape recorder unit, a voltage detector for detecting the voltage of the power source via the power source terminal, and a light emission semiconductor display device for digitally displaying the output of the voltge detector as the voltage of the power source.

Abstract: A volume controlled tape and alarm for a tape recorder is disclosed. The tape end alarm is coupled between a microphone and an audio amplifier and includes an automatic gain control circuit for maintaining a constant recording level, an oscillator for generating an audio frequency signal, and a variable volume control resistor for coupling the output of the oscillator circuit to the automatic gain control circuit. The volume of the audio alarm signal can be adjusted by adjusting the position of an externally adjustable knob connected to the variable resistor.

Abstract: An electric device for use in a transcriber comprising a main switch turned on or off in interlocking relation with a mechanism for setting to a position ready for operation a magnetic tape feed means and a magnetic tape reproduction means of a transcriber, a circuit for rewinding a magnetic tape at a specified speed including a first manually operable change-over switch and a tape rewinding solenoid for keeping the magnetic tape feed means at the rewinding position, a circuit for permitting the magnetic tape to undergo a high speed travel, including a second manually operable switch and energized in response to the operation of the second manually operable switch, a backspace circuit including a third changeover switch driven by the first foot pedal and intended to energize the tape rewinding solenoid in response to the operation of the third change-over switch to rewind the magnetic tape at a speed lower than that at the time of the rewinding and high speed travelling operation, a motor speed control circui

Abstract: A tape ending indicator comprises a flip-flop circuit responsive to a pulse signal derived from a rotating tape for producing a pulse of an increased width, which is applied to one input of an AND circuit which also receives count pulses of a given, constant frequency from a suitable source. The number of count pulses which are contained in the output signal from the AND circuit is counted in order to detect a change of the count above a first value or below a second value as the diameter of the roll of the taken up tape increases or decreases, thereby indicating the ending of the tape.

Abstract: An automatic gain control circuit employs a field effect transistor having a pair of gate electrodes. Distortion factor is minimized by applying a rectified and smoothed output signal to the first gate electrode and applying an input signal to the second gate electrode either directly or through a resistor.

Abstract: A circuit for eliminating a.c. noise current which is produced as a result of the interruption of electrical contact between a brush and a commutator of a d.c. motor and comprises a capacitor which applies the noise current to a transistor, which in turn inverts the waveform of the current and applies it in an inverted phase to a power source for the motor, thereby cancelling the a.c. noise.

Abstract: A battery checker circuit comprises a voltage divider connected across a storage battery and including a voltage detection resistor. The voltage developed across the detection resistor is sensed by a transistor, which conducts to energize a display element when the battery voltage is above a reference voltage. For a battery voltage below the reference voltage, the transistor is rendered nonconductive to deenergize the display element. The illumination or extinction of the display element indicates whether the battery voltage is above or below the reference voltage.

Abstract: An apparatus for detecting tape running in a tape recorder includes an AND circuit to which are applied an output signal of a generator which produces an audio signal and an output signal from a tape running detector which detects the running of a magnetic tape and produces a fixed output signal when a tape end is reached. An output signal from the AND circuit which corresponds to the audio signal is applied to a loudspeaker contained within the tape recorder for audibly warning that a tape end has been reached.