JP3063475U - Earphone radio - Google Patents

Abstract

(57) [Summary] [Problem] In this invention, even if the conventional earphone radio is tuned until the voltage is stabilized after the switch is turned on, the earphone radio detunes and needs to be retuned. It was necessary to stabilize. SOLUTION: An earphone radio which stabilizes the voltage by inserting a three-terminal regulator between a switch and a tuner circuit and does not detune even if tuning is performed immediately after the switch is turned on.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an earphone radio in which a tuning deviation caused by voltage instability at power-on is suppressed by inserting a three-terminal regulator into a power supply unit.

[0002]

[Prior art]

Current earphone radio, the use of the low power of the battery such as a button battery, the voltage V ₀ which after switch-on is required the time of several minutes to reach V ₁ of the constant voltage, during which a tuner circuit Could be detuned due to instability, requiring re-tuning.

[0003]

[Problems to be solved by the invention]

 The present invention seeks to develop an earphone radio that eliminates voltage fluctuations and does not require retuning.

[0004]

[Means for Solving the Problems]

 A three-terminal regulator was inserted between the switch and the tuner circuit, and the tuner voltage was stabilized immediately after the switch was turned on to prevent detuning.

[0005]

[Embodiment of the invention]

Conventionally, when using the low power of the battery such as button cell as in FIG. 3, the voltage of the switch throw after turning takes a few minutes to a constant voltage V ₀ as shown in FIG. 4, Therefore, during this Retuning was necessary because the tuner circuit became unstable and detuned. Therefore, in the present invention, by inserting a three-terminal regulator 5 between the switch 4 and the tuner circuit 2 as shown in FIG. 1, the voltage after the switch is turned on is immediately stabilized as shown in FIG. Lost stable state.

[0006]

[Effect of the invention]

 Therefore, an earphone radio that can be tuned immediately after switching on and does not need to be retuned was completed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of the invention.

Fig. 2 Voltage change after switch-on of the invention

FIG. 1 is a conventional circuit diagram.

FIG. 2 shows a conventional voltage change after a switch is turned on.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Tuner amplifier 3 Earphone speaker 4 Switch 5 Three-terminal regulator

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[Procedure amendment]

[Submission date] June 17, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a circuit diagram of the invention.

Fig. 2 Voltage change after switch-on of the invention

FIG. 3 is a conventional circuit diagram.

FIG. 4 shows a conventional voltage change after a switch is turned on.

[Description of Signs] 1 Battery 2 Tuner Amplifier 3 Earphone Speaker 4 Switch 5 Three-Terminal Regulator

Claims (1)

[Utility model registration claims] Earphone radio that prevents detuning by inserting a three-terminal regulator in the power supply