JPS5914439U - Amplifier circuit for telephone handset - Google Patents
Amplifier circuit for telephone handsetInfo
- Publication number
- JPS5914439U JPS5914439U JP10884382U JP10884382U JPS5914439U JP S5914439 U JPS5914439 U JP S5914439U JP 10884382 U JP10884382 U JP 10884382U JP 10884382 U JP10884382 U JP 10884382U JP S5914439 U JPS5914439 U JP S5914439U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- amount
- negative feedback
- preamplifier
- signal output
- 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.)
- Granted
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来例の回路構成図、第２図は従来回路による
入出力特性図、第３図は本考案の実施例を示す回路図、
第３−１図は本考案に用いる帰還回路や他の例を示す回
路図、第４図は本考案の入出力特性図である。
イ・・・送話器出力回路、口・・・前置増幅器、ハ・・
・負帰還回路、二・・・主増幅器、ホ・・・ダイオード
ブリッ′ジ、へ・・・出力端子、ト・・・音声スイッチ
ング回路、チ・・・定電圧電源回路、Ｃ２・・・結合コ
ンデンサ。FIG. 1 is a circuit configuration diagram of a conventional example, FIG. 2 is an input/output characteristic diagram of a conventional circuit, and FIG. 3 is a circuit diagram showing an embodiment of the present invention.
FIG. 3-1 is a circuit diagram showing a feedback circuit and other examples used in the present invention, and FIG. 4 is an input/output characteristic diagram of the present invention. A...Telephone output circuit, Mouth...Preamplifier, C...
・Negative feedback circuit, 2...main amplifier, H...diode bridge, G...output terminal, G...audio switching circuit, CH...constant voltage power supply circuit, C2...coupling capacitor.
Claims (1)
該結合コンデンサの出力の電気信号を増幅する前置増幅
器と、該前置増幅器の音声信号出力を増幅する主増幅器
と、該主増幅器の負帰還量を変化できる負部回路と、前
記前置増幅器の音声信号出力が予め定めた閾値を越えた
場合に前記負帰還回路の負帰還量を周波数の減少に応じ
て所要量だけ減少させるとともに前記閾値以下になった
ときに再びその一定量だけ負帰還量を増加させる音声ス
イッチング回路と、前記前置増幅器と前記音声スイッチ
ング回路に所要の電力を供給する定電圧電源回路とを備
えた電話送話器用増幅回路。A coupling capacitor inserted in series with the transmitter output circuit,
a preamplifier that amplifies the electrical signal output from the coupling capacitor, a main amplifier that amplifies the audio signal output of the preamplifier, a negative circuit that can change the amount of negative feedback of the main amplifier, and the preamplifier. When the audio signal output exceeds a predetermined threshold, the amount of negative feedback of the negative feedback circuit is reduced by the required amount in accordance with the decrease in frequency, and when the audio signal output falls below the threshold, the amount of negative feedback of the negative feedback circuit is reduced by the predetermined amount again. An amplifier circuit for a telephone handset, comprising: an audio switching circuit for increasing the amount of power; and a constant voltage power supply circuit for supplying the required power to the preamplifier and the audio switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10884382U JPS5914439U (en) | 1982-07-20 | 1982-07-20 | Amplifier circuit for telephone handset |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10884382U JPS5914439U (en) | 1982-07-20 | 1982-07-20 | Amplifier circuit for telephone handset |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5914439U true JPS5914439U (en) | 1984-01-28 |
| JPH026699Y2 JPH026699Y2 (en) | 1990-02-19 |
Family
ID=30253780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10884382U Granted JPS5914439U (en) | 1982-07-20 | 1982-07-20 | Amplifier circuit for telephone handset |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5914439U (en) |
-
1982
- 1982-07-20 JP JP10884382U patent/JPS5914439U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH026699Y2 (en) | 1990-02-19 |
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