JPS6117284A - Tape player provided with radio receiver - Google Patents

Abstract

PURPOSE:To curtail the number of circuits of a selective switch for switching tape-radio, and to simplify the wiring by grounding a bias of a pre-amplifier of a tape part by a switch interlocked with the selective switch or a transistor driven by a power source of a radio part. CONSTITUTION:When receiving a radio, a power source is switched by a selective switch S11, an electric signal is transferred to a power amplifier 20 and 21 from a receiving part and stereo reproducing part 11, and a loudspeaker 22 and 23 are sounded. Also, when the selective switch S11 is switched to a radio, a transistor 15 is turned on through a bias resistance 14, and an operation of a pre-amplifier 16 and 17 of a tape part is topped instantaneously. When reproducing a tape, the power source is switched, signals from a reproducing head 12 and 13 are transferred to the pre-amplifier 16 and 17, also transferred to a reproducing amplifier 18 and 19, and a loudspeaker 12 and 13 are sounded by the power amplifier 20 and 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape player with a radio receiver, which is equipped with a radio reception function and a tape playback function, and each function can be selectively switched by a selection switch.

Conventional configuration and its problems In recent years, small tape players with radio receivers have become available.

As weight reduction progresses, it is desired to reduce the number of electrical circuit parts and rationalize the nine circuits.

Itago's tape player with radio receiver will be described below with reference to the drawings. Fig. 1 is a configuration diagram of a conventional tape player with a radio receiver, in which 1 is a radio receiving section and a stereo playback section, 2 and 3 are left and right amplifiers for stereo tape playback, and 4 and 6 are speakers for making sounds. A power amplifier, 6 and 7 are speakers, 8 and 9 are playback heads for extracting electrical signals from the tape, Sl -1'1-2,
51-3 is a selection switch for radio reception and tape playback.

When selecting between radio reception and tape playback in the tape player with a radio receiver configured as described above, the selection switch 51-1 switches the power supply of the receiver/stereo playback section and the left and right amplifiers 2 and 3. None, the selection can be changed by switching between radio and tape signals using the selection switches S1-2, S1-, :.

However, in the above configuration, three selection switches are required, so the number of switch circuits is large, the shape of the switch is thick, the place where the switch can be placed is limited, and the wiring becomes complicated. The shape of the switch is important for miniaturization.

The problem was that the wiring was complicated.

OBJECTS OF THE INVENTION An object of the present invention is to provide a tape pre-key with a radio receiver that can be downsized by reducing the number of selection switch circuits and solving the complexity of wiring.

Structure of the Invention The tape pre-key with a radio receiver of the present invention switches the power supply of the radio section and the tape section by the selection switch of tape and radio, and when receiving the radio, the power supply of the radio section or the switch linked to the selection switch is used. It is configured so that the bias circuit of the preamplifier in the tape section is cut off by the driven transistor, which reduces the number of switch circuits and the wiring between the switch and each amplifier.
This allows for miniaturization.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to all the drawings. FIG. 2 shows a tape pre-key with a radio receiver in one embodiment of the present invention. In Figure 2,
11 is a radio receiving section and a stereo playback section; 12 and 1;
3 is a playback head for extracting electrical signals from the tape, 14 is a bias resistor, 15 is a switching transistor, 16
and 17 are left and right preamplifiers of the tape section, 18 and 21
9 is a reproducing amplifier on the left and right sides of the tape section, 20 and 21 are power amplifiers that sound the speakers, 22 and 23 are speakers, S1
1 is a tape and radio selection switch.

The operation of the tape pre-key with radio receiver of this embodiment constructed as described above will be described below. First, during radio reception, the power source is switched by the selection switch S11, and a stain signal is transmitted from the reception section and stereo reproduction section 11 to the power amplifiers 20 and 21, and the speakers 22 and 23 are sounded. 1 fc, when the selection switch S11 is switched to radio, the transistor 15i is connected through the bias resistor 14.
Turn it ON to instantly stop the operation of the preamplifiers 16 and 17 in the tape section. Select switch when playing tape
11 switches the power supply, and the playback heads 12 and 1
The signals from power amplifier 2 are transmitted to preamplifiers 16 and 17 as well as to regenerative amplifiers 18 and 19.
Speakers 12 and 13 are sounded at 0 and 21.

EFFECTS OF THE INVENTION As is clear from the above description, the present invention enables the preamplifier of the tape section to be controlled by a transistor driven by the power source of the radio section, which is linked to the selection switch for switching between radio and tape. Since the bias is configured to be grounded, it is possible to reduce the number of selection switch circuits for switching the tap radio and to simplify the wiring. Furthermore, since the bias of the preamplifier in the tape section is grounded, an excellent effect can be obtained in that the tape signal is prevented from leaking into the radio reception until the tape stops at the moment the tape is switched to the radio.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional tape pre-key with a radio receiver, and FIG. 2 is a block diagram of a tape pre-key with a radio receiver according to an embodiment of the present invention. 11... Receiving section and stereo playback section, 12.1
3... Playback head, 14... Bias resistor,
15...Transistor, 16.17...Preamplifier, 18°19...Regenerative amplifier, 20.21
...Power amplifier, S11...Selection switch.

Claims (1)

[Claims] The tape and radio selection switch switches the power supply for the radio section and the tape section, and during radio reception, the switch linked to the selection switch or the transistor driven by the radio section power supply biases the preamplifier of the tape section. A tape player with a radio receiver, characterized in that it is configured to cut a circuit.