CN2737070Y - Automatic control circuit for audio signal and power supply of frequency modulation broadcasting receiver-amplifier - Google Patents
Automatic control circuit for audio signal and power supply of frequency modulation broadcasting receiver-amplifier Download PDFInfo
- Publication number
- CN2737070Y CN2737070Y CN 200420063294 CN200420063294U CN2737070Y CN 2737070 Y CN2737070 Y CN 2737070Y CN 200420063294 CN200420063294 CN 200420063294 CN 200420063294 U CN200420063294 U CN 200420063294U CN 2737070 Y CN2737070 Y CN 2737070Y
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- CN
- China
- Prior art keywords
- amplifier
- frequency modulation
- circuit
- power supply
- audio
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- Expired - Fee Related
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Abstract
The utility model aims to disclose an automatic control circuit for the audio signal of a frequency modulation broadcasting amplifier. When signals are output from the receiving part of the frequency modulation broadcasting amplifier, the control circuit is triggered by the signals of the muting circuit of the receiver and works, and automatically accesses the received signals to the power amplification circuit; the reception and the amplification are organically combined into an integral body. When the frequency modulation reception is abnormal, the amplifier does not work, which can ensure the broadcasting of the output end of the amplifier having no noise and eliminating unwanted signals. The utility model is a combined amplifier which is connected in series by the crystal amplifying tubes BG1 and BG, which is characterized in that the base plate of BG1 is connected with the signal output end of the muting circuit of the frequency modulation amplifier via a resistance R1; the output load of BG2 is the work coil of a relay CJ1; the collector electrode of BG1 is connected with the base electrode of BG2 via a resistance R2; the emitter electrode of BG2 is connected with the positive electrode of the power supply; one end of the work coil of CJ1 is connected with the collector electrode of BG2, and the other end is connected with the ground; the movable contact of CJ1 is connected with the audio output end of the frequency modulation receiver; the fixed contact of CJ1 is connected with the audio input end of the power amplification circuit of the amplifier, the other group of contacts of CJ1 are the power supply circuit of the power amplification circuit, which turns on the power supply of the power amplification circuit following the occurrence of the signals of the audio output end.
Description
Technical field:
The utility model is a kind of FM receiver and sound amplifier combination technique. promptly realize the control circuit of audio signal and amplifier power supply auto switching.
Technical background:
General sound amplifier by FM receiver independently and independently sound amplifier form, often after radio reception is partly started working, when being transferred to desired signal, again the operating switch of sound amplifier is opened, this working method operation inconvenience needs labor management, must have the operator on duty on the scene.
Summary of the invention:
The utility model purpose is to disclose a kind of FM broadcasting amplifier audio signal and automatic control circuit of power supply.When frequency modulation expands the receiving unit broadcast sound amplifier signal output is arranged, this control circuit is received the signal triggering of the squelch circuit of answering a pager's call and works, automatically the signal that receives is linked in the power amplifier, and amplifier power supply is connected automatically, makes radio reception and the organic assembling that amplifies is an one.When FM reception was undesired, sound amplifier was not worked, and can guarantee that the sound amplifier output does not have the broadcast of noise and elimination unwanted signal.
The utility model is a unit amplifier by crystal amplifier tube BG1 and BG serial connection.The substrate that it is characterized in that BG1 connects the squelch circuit signal output part of frequency modulation sound amplifier through resistance R 1, and the output loading of BG2 is the actuating coil of relay CJ1; The collector electrode of BG1 connects the base stage of BG2 through resistance R 2; The emitter of BG2 connects positive source, the actuating coil one termination BG2 collector electrode of CJ1, other end ground connection; The moving contact of CJ1 connects the audio output of frequency modulation receiver; Fixed contact connects the power amplification circuit of audio power amplifier audio input end, and another group contact is the power circuit of power amplifier, connects the power supply of power amplifier along with the appearance of audio output signal.
Description of drawings
Fig. 1 is the utility model circuit diagram;
Embodiment:
The switching signal control relay JC of the utility model by frequency modulation squelch circuit output deciliter, control the loudspeaker on/off automatically, and reach the automatic broadcast of audio signal.Purified signal is transported to BG1 at the A point, and BG2 amplifies, and the BG2 amplified current is by relay J C coil, and the control dynamic/static contact is connected power amplifier energising work.The utility model is integrated Conversion Receiver and sound amplifier circuit bank, the signal that effectively receives is connected to micropkonic power amplifier automatically and broadcasts.
Claims (1)
1. FM broadcasting amplifier audio signal and automatic control circuit of power supply, it is a unit amplifier by crystal amplifier tube BG1 and BG serial connection, the substrate that it is characterized in that BG1 connects the squelch circuit signal output part of frequency modulation sound amplifier through resistance R 1, and the output loading of BG2 is the actuating coil of relay CJ1; The collector electrode of BG1 connects the base stage of BG2 through resistance R 2; The emitter of BG2 connects positive source, the actuating coil one termination BG2 collector electrode of CJ1, other end ground connection; The moving contact of CJ1 connects the audio output of frequency modulation receiver; Fixed contact connects the power amplification circuit of audio power amplifier audio input end, and another group contact is the power circuit of power amplifier, connects the power supply of power amplifier along with the appearance of audio output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420063294 CN2737070Y (en) | 2004-08-18 | 2004-08-18 | Automatic control circuit for audio signal and power supply of frequency modulation broadcasting receiver-amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420063294 CN2737070Y (en) | 2004-08-18 | 2004-08-18 | Automatic control circuit for audio signal and power supply of frequency modulation broadcasting receiver-amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2737070Y true CN2737070Y (en) | 2005-10-26 |
Family
ID=35307796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420063294 Expired - Fee Related CN2737070Y (en) | 2004-08-18 | 2004-08-18 | Automatic control circuit for audio signal and power supply of frequency modulation broadcasting receiver-amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2737070Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405747C (en) * | 2006-06-06 | 2008-07-23 | 李蓉梅 | Radio with interphone |
| CN1913385B (en) * | 2006-07-14 | 2011-03-30 | 广州矽金塔电子有限公司 | Controllable frequency modulation transmitting method and its device and application |
-
2004
- 2004-08-18 CN CN 200420063294 patent/CN2737070Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405747C (en) * | 2006-06-06 | 2008-07-23 | 李蓉梅 | Radio with interphone |
| CN1913385B (en) * | 2006-07-14 | 2011-03-30 | 广州矽金塔电子有限公司 | Controllable frequency modulation transmitting method and its device and application |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |