JPH0126074B2 - - Google Patents
Info
- Publication number
- JPH0126074B2 JPH0126074B2 JP7034183A JP7034183A JPH0126074B2 JP H0126074 B2 JPH0126074 B2 JP H0126074B2 JP 7034183 A JP7034183 A JP 7034183A JP 7034183 A JP7034183 A JP 7034183A JP H0126074 B2 JPH0126074 B2 JP H0126074B2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting diode
- resistor
- emitting diodes
- series circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- 230000002265 prevention Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は発光ダイオードを利用して入力信号レ
ベルを段階的に表示する入力レベル表示装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an input level display device that uses light emitting diodes to display input signal levels in stages.
従来例の構成とその問題点
近年、スピーカシステムその他のオーデイオ機
器において、入力信号レベルに応じて複数の発光
ダイオードを順次点灯させ、これにより入力信号
レベルを段階的に表示するものが多くなつてき
た。Conventional configurations and their problems In recent years, there has been an increase in the number of speaker systems and other audio equipment that display the input signal level in stages by lighting up multiple light emitting diodes in sequence according to the input signal level. .
以下、そのような従来の入力レベル表示装置に
ついて説明する。 Hereinafter, such a conventional input level display device will be explained.
第１図は従来の入力レベル表示装置を示すもの
であり、１〜４は発光ダイオード、５〜８は各発
光ダイオードの逆耐圧防止用のダイオード、９〜
１２は互に異なるツエナー電圧を有するツエナー
ダイオード、１３〜１６は過電流防止用の抵抗で
ある。 Fig. 1 shows a conventional input level display device, in which 1 to 4 are light emitting diodes, 5 to 8 are diodes for preventing reverse breakdown voltage of each light emitting diode, and 9 to 4 are light emitting diodes.
12 is a Zener diode having a different Zener voltage, and 13 to 16 are resistors for overcurrent prevention.
以上のように構成された入力レベル表示装置に
ついて以下その動作を説明する。 The operation of the input level display device configured as described above will be explained below.
ツエナーダイオード９〜１２のツエナー電圧
は、ツエナーダイオード９が最も低く、ツエナー
ダイオード１２が最も高いとする。入力端子に加
わつた入力電圧がツエナーダイオード９のツエナ
ー電圧より低いうちはいずれの発光ダイオードに
も電流が流れず、したがつてすべての発光ダイオ
ードが消灯している。そして入力電圧が大きくな
ると、それに応じて発光ダイオード１，２，３，
４が順次点灯し、入力レベルを表示する。 It is assumed that the Zener voltages of the Zener diodes 9 to 12 are the lowest in the Zener diode 9 and the highest in the Zener diode 12. As long as the input voltage applied to the input terminal is lower than the Zener voltage of the Zener diode 9, no current flows through any of the light emitting diodes, and therefore all the light emitting diodes are turned off. When the input voltage increases, the light emitting diodes 1, 2, 3,
4 lights up in sequence to display the input level.
しかしながら、上記の従来の構成では素子数が
多く、コストが高くなるという問題点を有してい
る。 However, the conventional configuration described above has a problem in that the number of elements is large and the cost is high.
発明の目的
本発明は上記従来の問題点を解消するもので、
素子数が少く、安価な入力レベル表示装置を提供
することを目的とする。Purpose of the invention The present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide an inexpensive input level display device with a small number of elements.
発明の構成
本発明は、第１の発光ダイオードと第１の抵抗
の直列回路と、第２の発光ダイオードと第２の抵
抗の直列回路と、第３、第４の発光ダイオードの
直列回路と、第５、第６の発光ダイオードの直列
回路とを互に並列接続し、この並列接続回路と直
列に第３の抵抗を接続し、上記第１、第５、第６
の発光ダイオードを同一の順電流方向に接続する
とともに、上記第２、第３、第４の発光ダイオー
ドを上記第１、第５、第６の発光ダイオードとは
逆の同一順電流方向に接続し、上記第２の抵抗の
値を上記第１の抵抗の値より大きくし、上記並列
接続回路と上記第３の抵抗の直列回路の両端に電
圧を加え、この電圧のレベルに応じて、上記第１
の発光ダイオード、第２の発光ダイオード、第
３、第４の発光ダイオード、第５、第６の発光ダ
イオードを順次点灯させるようにしたものであ
る。このようにすれば、第１図に示す逆耐圧防止
用ダイオード５〜８、ツエナーダイオード９〜１
２が不要となり、また抵抗の数も少なくすること
ができる。また、第１、第２の抵抗の値をほぼ等
しくし、第５、第６の発光ダイオードと直列に同
一順電流方向にダイオードを接続した場合には、
各発光ダイオードの明るさのばらつきも防止でき
る。Structure of the Invention The present invention provides a series circuit of a first light emitting diode and a first resistor, a series circuit of a second light emitting diode and a second resistor, a series circuit of third and fourth light emitting diodes, A fifth and a sixth series circuit of light emitting diodes are connected in parallel with each other, a third resistor is connected in series with this parallel connection circuit, and a third resistor is connected in series with the first, fifth and sixth light emitting diodes.
light emitting diodes are connected in the same forward current direction, and the second, third, and fourth light emitting diodes are connected in the same forward current direction opposite to the first, fifth, and sixth light emitting diodes. , the value of the second resistor is made larger than the value of the first resistor, a voltage is applied across the parallel connection circuit and the series circuit of the third resistor, and the voltage of the second resistor is increased according to the level of this voltage. 1
The light emitting diode, the second light emitting diode, the third and fourth light emitting diodes, and the fifth and sixth light emitting diodes are sequentially turned on. In this way, the reverse breakdown voltage prevention diodes 5 to 8 and the Zener diodes 9 to 1 shown in FIG.
2 becomes unnecessary, and the number of resistors can also be reduced. Furthermore, when the values of the first and second resistors are made almost equal and the diodes are connected in series with the fifth and sixth light emitting diodes in the same forward current direction,
It is also possible to prevent variations in the brightness of each light emitting diode.
実施例の説明
第２図は本発明の一実施例を示すものであり、
第１の発光ダイオードD1と第１の抵抗R1が、第
２の発光ダイオードD2と第２の抵抗R2が、第３、
第４の発光ダイオードD3，D4が、更には第５、
第６の発光ダイオードD5，D6が、それぞれ直列
に接続され、これらの直列回路が互いに並列に接
続され、この並列接続回路に対して第３の抵抗
R3が直列に接続されている。なお、第２図から
も明らかなように、第１、第５、第６の発光ダイ
オードD1，D5，D6は同一の順電流方向に接続し、
第２、第３、第４の発光ダイオードはそれらとは
逆の同一順電流方向に接続している。また第２の
抵抗R2の値を第１の抵抗R1の値より大きく設定
している。そして上記並列接続回路と第３の抵抗
R3の直列回路の両端を入力端子１７，１８とし、
ここに入力電圧を加える。DESCRIPTION OF EMBODIMENTS FIG. 2 shows an embodiment of the present invention.
The first light emitting diode D 1 and the first resistor R 1 are connected to each other, the second light emitting diode D 2 and the second resistor R 2 are connected to the third,
The fourth light emitting diode D 3 , D 4 further includes the fifth light emitting diode D 3 , D 4 .
Sixth light emitting diodes D 5 and D 6 are connected in series, these series circuits are connected in parallel with each other, and a third resistor is connected to this parallel connection circuit.
R 3 are connected in series. Note that, as is clear from FIG. 2, the first, fifth, and sixth light emitting diodes D 1 , D 5 , and D 6 are connected in the same forward current direction,
The second, third, and fourth light emitting diodes are connected in the same forward current direction opposite to them. Further, the value of the second resistor R 2 is set larger than the value of the first resistor R 1 . and the above parallel connection circuit and the third resistor
Both ends of the series circuit of R 3 are input terminals 17 and 18,
Add the input voltage here.
以上のように構成された本実施例の動作を説明
する。 The operation of this embodiment configured as above will be explained.
まず、入力電圧レベルが、第１の発光ダイオー
ドD1の電圧降下電圧（約2V）となると、第１の
発光ダイオードD1が点灯する。このとき、第２
の抵抗R2の値が第１の抵抗R1の値より大きいた
め、第２の発光ダイオードD2は点灯しない。 First, when the input voltage level reaches the voltage drop of the first light emitting diode D1 (approximately 2V), the first light emitting diode D1 lights up. At this time, the second
Since the value of the resistor R 2 is greater than the value of the first resistor R 1 , the second light emitting diode D 2 does not light up.
ところが、入力電圧レベルが第２の発光ダイオ
ードの点灯レベルまで上昇すると、第２の発光ダ
イオードD2も点灯する。 However, when the input voltage level rises to the lighting level of the second light emitting diode, the second light emitting diode D2 also lights up.
さらに入力電圧レベルが上昇し、第２の発光ダ
イオードD2と第２の抵抗R2の両端電圧が第３、
第４の発光ダイオードD3，D4の合計の電圧降下
電圧（約4V）となると、第３、第４の発光ダイ
オードD3，D4が点灯する。 Furthermore, the input voltage level increases, and the voltage across the second light emitting diode D 2 and the second resistor R 2 becomes the third,
When the total voltage drop of the fourth light emitting diodes D 3 and D 4 is reached (approximately 4 V), the third and fourth light emitting diodes D 3 and D 4 are turned on.
さらに入力電圧レベルが上昇して、第１の発光
ダイオードD1と第１の抵抗R1の両端電圧が第５、
第６の発光ダイオードの合計の電圧降下電圧（約
4V）となると、第５、第６の発光ダイオードD5，
D6が点灯する。 Further, the input voltage level increases, and the voltage across the first light emitting diode D 1 and the first resistor R 1 increases to the fifth
The total voltage drop voltage of the sixth light emitting diode (approximately
4V), the fifth and sixth light emitting diodes D 5 ,
D 6 lights up.
このように上記実施例によれば、第１、第２、
第３の抵抗R1，R2，R3の値を適切に設定するこ
とによつて、従来と同様に入力電圧レベルを段階
的に表示することができる。しかも従来の逆耐圧
防止用ダイオード５〜８、ツエナーダイオード９
〜１２を省略し、抵抗の本数も少なくすることが
できる。 As described above, according to the above embodiment, the first, second,
By appropriately setting the values of the third resistors R 1 , R 2 , and R 3 , the input voltage level can be displayed stepwise as in the conventional case. In addition, conventional reverse voltage prevention diodes 5 to 8 and Zener diodes 9
12 can be omitted and the number of resistors can be reduced.
ところで、上記実施例のように第１、第２の抵
抗R1，R2の値を異ならせると、第１、第２の発
光ダイオードD1，D2を流れる電流値が異なるこ
とになり、その結果第１、第２の発光ダイオード
D1，D2の明るさが変化するという問題がある。 By the way, if the values of the first and second resistors R 1 and R 2 are made different as in the above embodiment, the current values flowing through the first and second light emitting diodes D 1 and D 2 will be different. As a result, the first and second light emitting diodes
There is a problem that the brightness of D 1 and D 2 changes.
このような問題を解決するためには、第３図に
示すように、第１、第２の抵抗R′1，R′2の値をほ
ぼ等しくし、第５、第６の発光ダイオードD5，
D6と直列にダイオードD7を接続すればよい。こ
のようにすれば、第１の発光ダイオードD1と第
１の抵抗R1の両端電圧が、第５、第６の発光ダ
イオードD5，D6とダイオードＤの合計の電圧降
下電圧（約5V）となつたときに、第５、第６の
発光ダイオードD5，D6が点灯することになる。
したがつて、この場合も第２図の実施例と同様に
入力電圧レベルを段階的に表示することができ
る。しかも第１、第２の抵抗R1′，R2′の値が等し
い又は近いから、第１、第２の発光ダイオード
D1，D2の明るさが異なるという問題もなくなる。 In order to solve this problem, as shown in FIG . ，
Just connect diode D7 in series with D6 . In this way, the voltage across the first light emitting diode D 1 and the first resistor R 1 will be the sum of the voltage drop voltage of the fifth and sixth light emitting diodes D 5 and D 6 and the diode D (approximately 5V ), the fifth and sixth light emitting diodes D 5 and D 6 light up.
Therefore, in this case as well, the input voltage level can be displayed in stages as in the embodiment of FIG. Moreover, since the values of the first and second resistors R 1 ′ and R 2 ′ are equal or close to each other, the first and second light emitting diodes
The problem of the brightness of D 1 and D 2 being different is also eliminated.
発明の効果
本発明は、第１の発光ダイオードと、第１の抵
抗の直列回路と、第２の発光ダイオードと第２の
抵抗の直列回路と、第３、第４の発光ダイオード
の直列回路と、第５、第６の発光ダイオードの直
列回路と、第５、第６の発光ダイオードの直列回
路とを互に並列接続し、この並列接続回路と直列
に第３の抵抗を接続し、上記第１、第５、第６の
発光ダイオードを同一の順電流方向に接続すると
ともに、上記第２、第３、第４の発光ダイオード
を上記第１、第５、第６の発光ダイオードとは逆
の同一順電流方向に接続し、上記第１の抵抗の値
を上記第２の抵抗の値より小さくし、上記並列接
続回路と上記第３の抵抗の直列回路の両端に電圧
を加え、この電圧のレベルに応じて、上記第１の
発光ダイオード、第２の発光ダイオード、第３、
第４の発光ダイオード、第５、第６の発光ダイオ
ードを順次点灯させるようにしたものであるか
ら、第１、第２、第３の抵抗の値を適切に設定す
ることによつて、従来と全く同様に入力電圧レベ
ルを段階的に表示することができ、しかも素子数
を大幅に削減することができる。また、第１、第
２の抵抗の値をほぼ等しくし、第５、第６の発光
ダイオードと直列に同一順電流方向にダイオード
を接続すれば、各発光ダイオードの明るさのばら
つきも防止することができる。Effects of the Invention The present invention provides a series circuit of a first light emitting diode and a first resistor, a series circuit of a second light emitting diode and a second resistor, and a series circuit of third and fourth light emitting diodes. , a series circuit of the fifth and sixth light emitting diodes and a series circuit of the fifth and sixth light emitting diodes are connected in parallel with each other, a third resistor is connected in series with this parallel connection circuit, and a third resistor is connected in series with the parallel connection circuit. The first, fifth, and sixth light emitting diodes are connected in the same forward current direction, and the second, third, and fourth light emitting diodes are connected in the opposite direction to the first, fifth, and sixth light emitting diodes. are connected in the same forward current direction, the value of the first resistor is smaller than the value of the second resistor, a voltage is applied across the series circuit of the parallel connection circuit and the third resistor, and this voltage is Depending on the level, the first light emitting diode, the second light emitting diode, the third light emitting diode,
Since the fourth light emitting diode, the fifth light emitting diode, and the sixth light emitting diode are turned on in sequence, by appropriately setting the values of the first, second, and third resistors, it is possible to In exactly the same way, input voltage levels can be displayed in stages, and the number of elements can be significantly reduced. Furthermore, by making the values of the first and second resistors approximately equal and connecting diodes in series with the fifth and sixth light emitting diodes in the same forward current direction, variations in brightness among the light emitting diodes can also be prevented. I can do it.
第１図は従来の入力レベル表示装置の回路図、
第２図、第３図は本発明の第１、第２の実施例の
回路図である。
D1〜D6……第１〜第６の発光ダイオード、R1，
R1′……第１の抵抗、R2，R2′……第２の抵抗、
R3……第３の抵抗、Ｄ……ダイオード、１７，
１８……入力端子。
Figure 1 is a circuit diagram of a conventional input level display device.
FIGS. 2 and 3 are circuit diagrams of first and second embodiments of the present invention. D1 to D6 ...first to sixth light emitting diodes, R1 ,
R 1 ′...first resistance, R 2 , R 2 ′...second resistance,
R 3 ...Third resistor, D...Diode, 17,
18...Input terminal.
Claims (1)
路と、第２の発光ダイオードと第２の抵抗の直列
回路と、第３、第４の発光ダイオードの直列回路
と、第５、第６の発光ダイオードの直列回路とを
互に並列接続し、この並列接続回路と直列に第３
の抵抗を接続し、上記第１、第５、第６の発光ダ
イオードを同一の順電流方向に接続するととも
に、上記第２、第３、第４の発光ダイオードを上
記第１、第３、第４の発光ダイオードとは逆の同
一順電流方向に接続し、上記第２の抵抗の値を上
記第１の抵抗の値より大きくし、上記並列接続回
路と上記第３の抵抗の直列回路の両端に電圧を加
え、この電圧のレベルに応じて、上記第１の発光
ダイオード、第２の発光ダイオード、第３、第４
の発光ダイオード、第５、第６の発光ダイオード
を順次点灯させるようにした入力レベル表示装
置。 ２ 第１の発光ダイオードと第１の抵抗の直列回
路と、第２の発光ダイオードと第２の抵抗の直列
回路と、第３、第４の発光ダイオードの直列回路
と、第５、第６の発光ダイオードとダイオードの
直列回路とを互に並列接続し、この並列接続回路
と直列に第３の抵抗を接続し、上記第１、第５、
第６の発光ダイオード及び上記ダイオードを同一
の順電流方向に接続するとともに上記第２、第
３、第４の発光ダイオードを上記第１、第５、第
６の発光ダイオードとは逆の同一順電流方向に接
続し、上記第１の抵抗の値を上記第２の抵抗の値
とほぼ等しくして上記並列接続回路と上記第３の
抵抗の直列回路の両端に電圧を加え、この電圧の
レベルに応じて、上記第１の発光ダイオード、第
２の発光ダイオード、第３、第４の発光ダイオー
ド、第５、第６の発光ダイオードを順次点灯させ
るようにした入力レベル表示装置。[Scope of Claims] 1 A series circuit of a first light emitting diode and a first resistor, a series circuit of a second light emitting diode and a second resistor, a series circuit of third and fourth light emitting diodes, A fifth and a sixth series circuit of light emitting diodes are connected in parallel to each other, and a third light emitting diode is connected in series with this parallel connected circuit.
the first, fifth, and sixth light emitting diodes are connected in the same forward current direction, and the second, third, and fourth light emitting diodes are connected to the first, third, and fourth light emitting diodes in the same forward current direction. The light emitting diode No. 4 is connected in the same forward current direction opposite to the light emitting diode No. 4, the value of the second resistor is made larger than the value of the first resistor, and both ends of the series circuit of the parallel connection circuit and the third resistor are connected. A voltage is applied to the first light emitting diode, the second light emitting diode, the third light emitting diode, and the fourth light emitting diode according to the level of this voltage.
An input level display device in which a fifth light emitting diode, a fifth light emitting diode, and a sixth light emitting diode are sequentially turned on. 2. A series circuit of the first light emitting diode and the first resistor, a series circuit of the second light emitting diode and the second resistor, a series circuit of the third and fourth light emitting diodes, and a series circuit of the fifth and sixth light emitting diodes. A light emitting diode and a series circuit of diodes are connected in parallel to each other, a third resistor is connected in series with this parallel connection circuit, and the first, fifth, and
A sixth light emitting diode and the above diode are connected in the same forward current direction, and the second, third and fourth light emitting diodes are connected in the same forward current direction opposite to the first, fifth and sixth light emitting diodes. a voltage is applied across the series circuit of the parallel connection circuit and the third resistor, with the value of the first resistor being approximately equal to the value of the second resistor, and the level of this voltage is Accordingly, the input level display device sequentially lights up the first light emitting diode, the second light emitting diode, the third and fourth light emitting diodes, and the fifth and sixth light emitting diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58070341A JPS59195276A (en) | 1983-04-20 | 1983-04-20 | Input level display unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58070341A JPS59195276A (en) | 1983-04-20 | 1983-04-20 | Input level display unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59195276A JPS59195276A (en) | 1984-11-06 |
| JPH0126074B2 true JPH0126074B2 (en) | 1989-05-22 |
Family
ID=13428613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58070341A Granted JPS59195276A (en) | 1983-04-20 | 1983-04-20 | Input level display unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59195276A (en) |
-
1983
- 1983-04-20 JP JP58070341A patent/JPS59195276A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59195276A (en) | 1984-11-06 |
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