JPS6416755U - - Google Patents
Info
- Publication number
- JPS6416755U JPS6416755U JP11182987U JP11182987U JPS6416755U JP S6416755 U JPS6416755 U JP S6416755U JP 11182987 U JP11182987 U JP 11182987U JP 11182987 U JP11182987 U JP 11182987U JP S6416755 U JPS6416755 U JP S6416755U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- telephone
- circuit
- telephone line
- signal
- 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
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 2
- 230000002159 abnormal effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第1図は本考案のミスダイヤル防止回路の一実
施例を備えたオンフツクモニター機能付電話機の
回路構成図、第2図は従来のオンフツクモニター
機能付電話機の回路構成図である。
主な図番の説明、37…第1トランジスタ、3
9…第2トランジスタ、41…コントロール回路
、43…フツクスイツチ、44…操作スイツチ、
45…ダイヤル信号発生回路、50…第3トラン
ジスタ、52…ツエナーダイオード。
FIG. 1 is a circuit diagram of a telephone with an on-hook monitor function equipped with an embodiment of the misdial prevention circuit of the present invention, and FIG. 2 is a circuit diagram of a conventional telephone with an on-hook monitor function. Explanation of main figure numbers, 37...first transistor, 3
9... Second transistor, 41... Control circuit, 43... Hook switch, 44... Operation switch,
45...Dial signal generation circuit, 50...Third transistor, 52...Zener diode.
Claims (1)
ツチの操作又はリンガー信号の検出等により電話
回線を閉結状態にできる機能を有する電話機にお
いて、前記電話回線に接続されたダイオードブリ
ツジ回路と通話動作を行なう通話回路との間に接
続し、前記電話回線に対しての開閉動作を行なう
第1トランジスタと、該第1トランジスタの動作
制御を行なう第2トランジスタと、前記操作スイ
ツチの操作又はリンガー信号検出動作に対応し第
2トランジスタを制御し、前記第1トランジスタ
をオン状態にさせるコントロール回路と、該コン
トロール回路と同様第2トランジスタに対し出力
信号を加え、前記第1トランジスタにダイヤル信
号送出動作させるダイヤル信号発生回路と、前記
ダイオードブリツジ回路と第1トランジスタの間
で電話回線に対し並列に接続され、電話回線間電
圧の制限動作を行なうツエナーダイオードと、該
ツエナーダイオードの動作制御を行なう第3トラ
ンジスタと、前記第1トランジスタと通話回路間
に並列に接続し、電話回線間電圧を受けて、前記
第3トランジスタの動作制御を行なう電圧検出回
路とを備え、ダイヤル信号送出動作時異常なダイ
ヤル信号が送出されないようにしたことを特徴と
する電話機のミスダイヤル防止回路。 A telephone circuit that performs a telephone call operation with a diode bridge circuit connected to the telephone line in a telephone set having a function of closing a telephone line by operating a control switch or detecting a ringer signal, etc., regardless of the opening/closing operation of a telephone switch. a first transistor that is connected between the telephone line and performs an opening/closing operation for the telephone line; a second transistor that controls the operation of the first transistor; and a second transistor that corresponds to the operation of the operation switch or the ringer signal detection operation. a control circuit that controls a second transistor and turns on the first transistor; and a dial signal generation circuit that applies an output signal to the second transistor similarly to the control circuit and causes the first transistor to operate to send a dial signal. , a Zener diode connected in parallel to the telephone line between the diode bridge circuit and the first transistor to perform a voltage limiting operation on the telephone line; a third transistor for controlling the operation of the Zener diode; and a voltage detection circuit connected in parallel between the first transistor and the telephone circuit to receive the voltage between the telephone lines and control the operation of the third transistor, so as to prevent abnormal dialing signals from being sent out during the dialing signal sending operation. A misdial prevention circuit for a telephone set.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11182987U JPS6416755U (en) | 1987-07-21 | 1987-07-21 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11182987U JPS6416755U (en) | 1987-07-21 | 1987-07-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6416755U true JPS6416755U (en) | 1989-01-27 |
Family
ID=31350224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11182987U Pending JPS6416755U (en) | 1987-07-21 | 1987-07-21 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6416755U (en) |
-
1987
- 1987-07-21 JP JP11182987U patent/JPS6416755U/ja active Pending
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