JPS599450Y2 - Amplifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amplification device capable of stereo reproduction, and its purpose is to make it possible to increase the maximum amplification output with an extremely simple structure.

Generally, an amplifier device has a maximum output specified as its rating, and cannot output an output exceeding that rating.

However, when using an amplification device, especially one with a relatively low maximum output such as a portable tape recorder, radio receiver, etc., it would be nice to be able to increase the output a little more to produce a more powerful sound. Sometimes it makes the user feel like they could hear it.

The present invention attempts to satisfy these requirements with an extremely simple structure.
An embodiment thereof will be described below with reference to the drawings.

In the figure, 1 is SEPP OTL (Single E
nded Push-Pull Output
The first amplifier 2 is configured with a Transformer Less) circuit, and 2 is an S
The second amplifier is of EPPOTL type, 1a and 2a are input ends of these amplifiers, and lb and 2b are output ends of the same.

The output terminal 1b of the first amplifier 1 is connected to the first external connection jack 4 from the DC cut capacitor 3 through the first external connection jack 4.
is connected to the speaker 5 of.

On the other hand, the output end 2b of the second amplifier 2 is connected from the DC cut capacitor 6 to the second external connection jack 7, and further to the first external connection jack 1 through the built-in switch section 8 and then to the second speaker 9. It is connected.

The switch section 8 has a fixed contact 8a and a common contact 8b.
, the other fixed contact 8C, and normally the one fixed contact 8a and the common contact 8b are in contact with each other, but by inserting and connecting the plug into the first external connection jack 4, the one fixed contact 8a and the common contact 8b are connected. The contact state between the common contact 8a and the common contact 8b is released, and the common contact 8b and the other fixed contact 8C are brought into contact.

When the plug is removed, the one fixed contact 8a and the common contact 8b are brought into contact again.

One fixed contact 8a is connected to the second speaker 9, and the other fixed contact 8C is connected to the ground terminal 4C of the first external connection jack 4.

The common contact 8b is connected from the auxiliary terminal 7b of the second external connection jack 7 to the output terminal 2b of the second amplifier 2 via the signal application terminal 7a and the capacitor 6.

In the above embodiment, the first and second external connection jacks 4.
7 When no plug is connected to any of them, the signal application terminal 4a and auxiliary terminal 4b of the first external connection jack 4 and the signal application terminal 7a and auxiliary terminal 7b of the second external connection jack 7 are connected as shown in the figure. are in contact with each other, and one fixed contact 8a and common contact 8b of the switch 8 are in contact with each other.

Therefore, at this time, the output terminal 1b of the first amplifier 1 is
is connected to the speaker 5 of the second amplifier 2, and the output terminal 2b of the second amplifier 2
is connected to the second speaker 9.

Therefore, for example, the input terminal 1 of the first and second amplifiers 1, 2
Applying the left channel signal and right channel signal, which constitute a stereo signal, to a and 2a, respectively,
The left channel and right channel sounds are played from speakers 5 and 9, respectively, allowing stereo sound to be heard.

It goes without saying that if the human power terminals 1a and 2a are made common, the sound reproduced from the speakers 5.9 will be monaural.

Next, the first and second speakers 5 and 9 built into the device
If there is an external speaker separate from the external speaker, connecting the connection plug of this speaker to the second external connection jack 7 releases the contact between the terminals 7 a and 7 b of the jack 7, so that the connection from the second amplifier 2 The output of is supplied only to the external speaker.

At this time, since the first speaker 5 is operating by receiving the output from the first amplifier 1, the first speaker 5 and the first speaker 1
Stereo playback can be performed using external speakers.

Next, when the external speaker is removed from the second external connection jack 7 and connected to the first external connection jack 4, the contact between the terminals 4a and 4b of the jack 4 is released, and at the same time, the built-in switch in the jack 4 is disconnected. 8 common contacts 8b are switched from one fixed contact 8a to the other fixed contact 8C.

Accordingly, the signal supply lines of the first and second speakers 5 and 9 are both cut off, and both speakers become inoperable.

The output terminals 1b and 2b of the first and second amplifiers 1 and 2 are connected from the signal application terminal 4a of the jack 4 to the ground terminal 4C via an external speaker, and further to the contact 8C of the switch 8,
8b through terminals 7b and 7a of the jack 7, and the first and second amplifiers 1 and 2 are BTL (Balan
edTransformer Less) circuit is constructed.

As is well known, this BTL circuit outputs four times the output of the SEPPOTL circuit, so the driving output of the external speaker is increased, and powerful monaural reproduction sound can be enjoyed.

At this time, it is necessary to configure the first and second amplifiers 1 and 2 so that they are driven by the same signal.

Next, if there are two external speakers, by connecting these speakers to the first and second jacks 4 and 7, the first and second speakers 5 and 9 built into the device can be connected.
SEPP with only two Nakabe speakers inactive.
Stereo sound or monaural sound can be reproduced by the amplification of the OTL circuit.

Note that the portion numbered 10 in the figure is an integrated circuit (IC).

As explained above, the amplifier device of the present invention is SEPPOTL
Connect the first and second speakers to the output sides of the two amplifiers configured in the circuit via two external connection jacks, and connect one of the two external connection jacks to the output side with a switch. Normally, the first and second speakers are driven from the first and second amplifiers, respectively, through these two jacks, and external speakers are connected to the first and second jacks through plugs, respectively. By connecting the external speaker, the first and second speakers are disconnected and the external speaker is driven.On the other hand, by connecting the external speaker only to the first external connection jack via a plug, the first and second speakers are disconnected and the external speaker is driven. A speaker is disconnected, and the first jack is switched by the plug so that the outputs of the first and second amplifiers connect to this one external speaker.
According to this, when no external speakers are connected, the first and second speakers are driven to enjoy stereo playback, and the first and second speakers are driven.
By connecting external speakers to the second jacks via plugs, the first and second speaker power is disconnected and stereo playback can be enjoyed using these external speakers. By connecting an external speaker via a plug, it is possible to perform high-output monaural playback using the BTL circuit, so it can be used as a high-output public address system with portable radios and tape recorders. It is highly practical and can be used for multiple purposes.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention. 1, 2...Amplifier, 4,7...External connection jack, 5,9...Speaker, 8...
··switch.

Claims (1)

[Scope of utility model registration request] a first amplifier configured with a SEPPOTL circuit; a second amplifier having the same structure as the first amplifier;
a first converting each signal from a second amplifier into audio;
, a second speaker, the first and second amplifiers, and a first,
An amplification device capable of stereo reproduction that includes first and second external connection jacks interposed between a second speaker, the first external connection jack having a signal application terminal and a signal application terminal. a switch consisting of a first fixed contact, a second fixed contact and a common contact usually contacted with the first fixed contact; The connection jack is a signal application terminal,
The signal application terminal of the first external connection jack is connected to the output terminal of the first amplifier via a capacitor, and the auxiliary terminal and the ground terminal are connected to each other. A first speaker is connected between the first fixed contact of the switch and the second speaker, and a second speaker is connected between the first fixed contact of the switch and the ground.
The ground terminal of the first external connection jack is connected to the second fixed contact of the switch, and the signal application terminal of the second external connection jack is connected to the auxiliary terminal of the external connection jack of the switch via the capacitor. The first and second speakers are connected to the output terminal of the second amplifier, and the ground terminal thereof is connected to the ground, and the external speakers are connected to the first and second external connection jacks via plugs, respectively. By disconnecting the power from the output terminal of the amplifier and connecting the external speaker to the output terminal of the first and second amplifiers respectively, and connecting the external speaker only to the first external connection jack via the plug, the above The first and second speakers are disconnected, and the common contact of the switch is connected to a second fixed contact by the plug, so that the outputs of the first and second amplifiers drive this one external speaker BTL. An amplifying device configured to.