JPH029511Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection cord used for connection between amplifiers in an audio reproduction system or the like.

As an audio amplifier, it detects and amplifies low-frequency vibration components below a predetermined frequency from its output signal, and then feeds back this detection output negatively to the input side to attenuate the low-frequency vibration components and reduce the load. An amplifier is known that has a configuration in which a parasitic signal component occurring on the ground side is positively fed back to the positive side of a load via the amplifier to cancel the parasitic signal component.

Taking a preamplifier as an example, the above amplifier has a frequency characteristic in which the total gain is flat up to the DC region, as shown in Figure 1, and an audio signal is input to the non-inverting input. The output of the dynamic main amplifier 1 is connected to the positive output terminal 2a of the first terminal 2, and the output is connected to the integrating resistor R.
connected to the inverting input of the differential sub-amplifier 3 via
This inverted input is connected to the output of the sub-amplifier 3 through a capacitor C to form a Miller integration circuit 4, and the output of this Miller integration circuit 4 is connected to the inverted input of the main amplifier 1 through a phase inversion circuit 5. to form an amplified negative feedback loop, and the first
The negative side output terminal 2b of the terminal 2 is connected to the negative side sensor terminal 6b of the second terminal 6, and the positive side sensor terminal 6a is connected to the non-inverting input of the sub-amplifier 3. It has a configuration in which a positive feedback loop with a gain of "1" is formed from the terminal 6 to the first terminal 2 via the Miller integrating circuit 4, the phase inverting circuit 5, and the main amplifier 1.

And this preamplifier has its first terminal 2
By connecting the positive side output terminal 2a and the negative side output terminal 2b of the main amplifier 9 to the positive side terminal 10a and the negative side terminal 10b of the input terminal 10 of the main amplifier 9 via the first connection cord 8, respectively. is connected to the negative side terminal 1 of the input terminal 10.
0b are respectively connected to the positive side terminal 6a of the second terminal 6 of the preamplifier via the second connection cord 11.

The applicant proposed a connection cord suitable for such uses in U.S. Pat. No. 54-149129.

To explain with reference to FIG. 2, the core wire 7 is covered with a net-shaped shield wire portion 12, pin jack connecting portions 13 and 14 are provided at both ends thereof, and positive side terminals 13a and 14a of the pin jack connecting portions 13 and 14 are provided.
is connected to the core wire 7, and the negative side terminals 13b and 14b are connected to the shield wire part 12, respectively.In the conventionally known structure, one pin jack connection part 13 is provided with another pin jack connection part 15, and the positive side of this pin jack connection part 15 is connected to the core wire 7. Connect the terminal 15a to the first connection cord 8
It has a structure in which it is connected to the negative terminal 14b of the other pin jack connection section 14, that is, the end of the shielded wire section 12, via a second connection cord 11 provided along the line for transmitting parasitic signal components. .

This connection cord is suitable for connection between amplifiers as described above, but since this connection mode itself is special, the first connection cord 8 having the general structure described above is used. , it was not possible to connect these types of amplifiers.

The present invention improves on these conventional drawbacks, and will be explained below with reference to the drawings.

In FIG. 3, 16 has first and second
This is a general, conventionally known connection cord provided with pin jack connections 17, 18.

Reference numeral 19 denotes a female pin jack connecting portion 20 into which the second pin jack connecting portion 18 of the connection cord 16 is fitted at both ends, and another amplifier (main amplifier).
A pin jack provided with a male pin jack connection part 21 that is fitted into the input pin jack connection part of the
A connecting terminal 23 is electrically connected to the negative terminal 22 by a known fixing means such as screwing.

To this connecting terminal 23, the other end of a lead wire 25 having a third pin jack connecting portion 24 at one end is attached or detachably connected. For example, as shown in the figure, this connection means has a through hole 26 in the connection terminal 23, and the lead wire 25 has a fixing screw 27 screwed into an axial screw hole 28 communicating with the through hole 26. As shown in the second connection cord 11 shown in FIG. 1, the negative side terminal 10b of the main amplifier 9 and the positive side terminal 6a of the second terminal 6 of the preamplifier are connected to Since the purpose is to feed back parasitic signal components generated in the preamplifier, a normal lead with an insulating coating formed only on the center conductor, that is, on the outside of the core wire (center conductor), such as the second connection cord 11 in Fig. 2, is used. Alternatively, a so-called core wire (center conductor) portion of a shield wire may be used, in which a shield wire portion (outer conductor) is formed on the outside of the core wire (center conductor) with an insulating coating interposed therebetween.

If this is represented graphically, the former will be as shown in FIG. 4, and the latter will be as shown in FIG. 5.

According to the above structure, the male pin jack connection part 21 of the pin jack 19 is connected to the input pin jack connection part of another amplifier (main amplifier), and the connection cord 16 is used to connect the pin jack 19 and the amplifier (preamplifier). At the same time, the third pin jack connection 24 can be connected to the second terminal 6 of the amplifier (preamplifier). That is, by using the lead wire 25 provided with the pin jack 19 and the third pin jack connection part 24, the common well-known connection cord 16 can be connected to the first pin jack connection part 24.
It can be used for connection in an amplifier device as shown in the figure.

As described above, the present invention has the practical advantage of being able to connect amplifiers for the above-mentioned special purpose using a commonly known connection cord without using a connection cord with a special structure. have

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional connection cord and amplifier, FIG. 2 is a diagram showing the structure of the connection cord, FIG. This figure is a diagram showing the structure of the connecting device in the same example, and FIG. 5 is a diagram showing the structure of the connecting device in another embodiment of the same. 19 is a pin jack, 20 and 21 are pin jack connection parts, 22 is a negative side terminal, 23 is a connection terminal, 2
4 is a pin jack connection part, and 25 is a lead wire.

Claims (1)

[Claims for Utility Model Registration] A main amplifier 1 having a first terminal 2 and a second terminal 6 is provided, the output of the main amplifier 1 is connected to the first terminal 2, and the output of the main amplifier 1 is connected to the first terminal 2. forming an amplification type negative feedback loop that detects and amplifies a low-frequency vibration component below a predetermined frequency from the output and negatively feeds the detected output to the input side of the main amplifier 1 to attenuate the low-frequency vibration component; , the first terminal 2 of the main amplifier 1 is connected to the input terminal 10 of the load 9, and the parasitic signal component generated on the ground side of the input terminal 10 is transmitted to the load via the second terminal 6 and the main amplifier 1. In the amplifier device, a connection cord 16 is provided with pin jack connections 17 and 18 at both ends thereof, in which a positive feedback loop is formed to provide positive feedback with a gain of 1 to the positive side of the input terminal 10 of 9 to cancel the parasitic signal component. A pin jack connecting part 20 connected to one pin jack connecting part 18 of the connection cord 16 and a pin jack connecting part 21 connected to the input terminal 10 of the load 9 are provided at both ends. Connect terminal 2 to negative terminal 22
A lead wire 2 is provided with a pin jack connection portion 24 connected to the second terminal 6 of the main amplifier 1 at one end.
5, one pin jack connection part 17 of the connection cord 16 is connected to the first terminal 2 of the main amplifier 1, and the other pin jack connection part 18 is connected to one pin jack connection part 20 of the pin jack 19. The other pin jack connection part 21 is connected to the input terminal 10 of the load 9, and the pin jack connection part 24 of the lead wire 25 is connected to the second terminal 6 of the main amplifier 1. A connection device for an amplifier, characterized in that a terminal portion on the opposite side is connected to a connection terminal 23 of the pin jack 19.