JPS64569Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a signal level display device for an electric device equipped with a tape recorder, commonly called a "radio-cassette player" or the like.

Conventional electrical equipment of this kind requires a switch for changing the function of the equipment, such as a radio or tape recorder, as well as a switch for the display device, resulting in complex circuits and high costs.

The present invention was devised in view of the shortcomings of conventional devices, and is a device that can change the display content on the display device to match the above-mentioned functions by simply switching the function of the device with a switch. This is what we are trying to provide.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The attached drawing is an electric circuit showing one embodiment of the display device according to the present invention, in which 1 is a meter, 2 is a function changeover switch, and shows a first circuit system that functions as a radio (or television). 3, a fixed contact 2c connected to a second circuit system 4 that functions as a tape recorder, and both fixed contacts 2b and 2c can be selectively switched,
A movable contact 2a that applies a voltage of +BV to the first or second circuit system 3 or 4 through the selected fixed contact to bring these circuit systems 3 or 4 into a state where they can perform their respective functions; It consists of

5 is a transistor constituting the amplifier circuit,
Its collector side terminal is connected to the fixed contact 2c, and its base side terminal is connected to the second circuit system 4 through the recording/playback changeover switch 6, and the movable contact 2a of the function changeover switch 2 is connected to the fixed contact 2c. The second circuit system 4 is activated through the changeover switch 6 only when it is switched.
Amplify the recording or playback output obtained from
It is designed to be supplied to the input terminal 1a of.

Reference numeral 8 designates an output terminal provided between the midpoint between the capacitor 7 and the meter 1 and the first circuit system 3, and the movable contact 2 of the function changeover switch 2.
When a selects the fixed contact 2b and the second circuit system 3 is operating, the signal strength of the radio (or television) signal received by the second circuit system 3 is used as a radio signal strength output. Outputs voltage (DC).

Since this voltage is separated from the output of the amplifier circuit made up of the transistor 5 by the capacitor 7 in terms of direct current, a current flows directly to the meter 1.

Since the present invention is constructed as described above, the movable contact 2a of the function changeover switch 2 is connected to the fixed contact 2b, and +BV voltage is applied to the first circuit system 3.
When the first circuit system is set to an operating state (for example, a state in which it performs a radio function), the transistor 5 becomes inactive in this state. Output DC
A current corresponding to the voltage (corresponding to the signal strength of the radio signal) flows through the meter 1, which displays the value.

Further, when the movable contact 2a of the function changeover switch 2 is connected to the fixed contact 2c and a voltage of +BV is applied to the second circuit system 4 to set the circuit system 4 to the operating state, the transistor 5 becomes the operating state, and the transistor 5 becomes the operating state. 5 amplifies the recording or playback output obtained from the second circuit system 4 based on the state of the recording/playback switch 6, and supplies this amplified signal to the meter 1 via the capacitor 7, and the meter 1 is to display the recording or playback output level.

Note that at this time, since the first circuit system 3 is not operating, the DC voltage from the output terminal 8 is naturally 0V.

Since the present invention is constructed as described above, there is no need to provide a special switch for display, and therefore a signal level display device with a simple structure and low cost can be provided.

[Brief explanation of the drawing]

The accompanying drawing is an electrical circuit diagram showing an embodiment of the signal level display device according to the present invention. 1: Meter, 2: Function selector switch, 3: 1st
circuit system, 4: second circuit system, 5: transistor.

Claims (1)

[Claims for Utility Model Registration] In a device that selectively displays the signal strength of a received signal from a radio, television, etc. and the recording/playback output level of a tape recorder using a single display means, A changeover switch that selectively switches power supplied to a first circuit system and a second circuit system of a tape recorder; and an operation or non-operation state in response to the switching operation of the changeover switch. an amplification means is provided which is activated when the changeover switch selects the second circuit system, amplifies the recording and playback output of the tape recorder and supplies it to the display means; If the circuit system is selected, the radio,
A signal level display device for electrical equipment with a tape recorder, characterized in that a received signal from a television or the like is supplied to the display means.