JPH0279614U - - Google Patents
Info
- Publication number
- JPH0279614U JPH0279614U JP16013988U JP16013988U JPH0279614U JP H0279614 U JPH0279614 U JP H0279614U JP 16013988 U JP16013988 U JP 16013988U JP 16013988 U JP16013988 U JP 16013988U JP H0279614 U JPH0279614 U JP H0279614U
- Authority
- JP
- Japan
- Prior art keywords
- relay
- turns
- power
- light emitting
- emitting diode
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Amplifiers (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は従来例を示す回路図である。
１……時定数回路、２……増幅器、３……スピ
ーカ、４……リレー、ＲＳ……リレー接点、Ｑ１
……制御トランジスタ、Ｑ２……リレー駆動トラ
ンジスタ、Ｑ３……フオトトランジスタ、Ｄ１０
……発光ダイオード、５……フオトカプラ。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a circuit diagram showing a conventional example. 1...Time constant circuit, 2...Amplifier, 3...Speaker, 4...Relay, RS...Relay contact, Q1
...Control transistor, Q2 ...Relay drive transistor, Q3 ...Phototransistor, D10
...Light emitting diode, 5...Photocoupler.
Claims (1)
点を有するリレーと、該リレーを駆動するリレー
駆動トランジスタと、該リレー駆動トランジスタ
を制御する時定数回路と、電源遮断時にオン状態
になることにより前記リレー駆動トランジスタを
オフ状態にする制御トランジスタと、電源供給時
において点灯すると共に電源遮断時には消灯する
発光ダイオード、及び該発光ダイオードの点灯あ
るいは消灯に応じてオン状態あるいはオフ状態と
なり且つ前記制御トランジスタをオフ状態あるい
はオン状態にするフオトトランジスタよりなる電
源検出用フオトカプラとを備えたミユーテイング
回路。 A relay having a relay contact connected between an amplifier and a speaker, a relay drive transistor for driving the relay, a time constant circuit for controlling the relay drive transistor, and a time constant circuit for controlling the relay by turning on when the power is cut off. a control transistor that turns the drive transistor off; a light emitting diode that lights up when power is supplied and turns off when the power is cut off; and a light emitting diode that turns on or off in accordance with the lighting or turning off of the light emitting diode and turns off the control transistor. Or a muting circuit equipped with a power supply detection photocoupler made of a phototransistor that turns on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16013988U JPH0279614U (en) | 1988-12-08 | 1988-12-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16013988U JPH0279614U (en) | 1988-12-08 | 1988-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0279614U true JPH0279614U (en) | 1990-06-19 |
Family
ID=31441946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16013988U Pending JPH0279614U (en) | 1988-12-08 | 1988-12-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0279614U (en) |
-
1988
- 1988-12-08 JP JP16013988U patent/JPH0279614U/ja active Pending