CN2263429Y - Computer megaphone - Google Patents
Computer megaphone Download PDFInfo
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- CN2263429Y CN2263429Y CN 96244882 CN96244882U CN2263429Y CN 2263429 Y CN2263429 Y CN 2263429Y CN 96244882 CN96244882 CN 96244882 CN 96244882 U CN96244882 U CN 96244882U CN 2263429 Y CN2263429 Y CN 2263429Y
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Abstract
The utility model belongs to a sound device, particularly a computer megaphone which is mainly composed of an outer shell (1), an electret microphone (2), a circuit board (3) and a power supply (4). The computer megaphone is characterized in that the circuit board (3) is composed of a sound recording-reproducing circuit board, a signal processing circuit board and a power amplifying circuit board, and signals are processed through a circuit which is composed of LM324. Thereby, the shouting volume is large, the sound quality is clear, and the noise is small. The utility model simultaneously has the power down protection function.
Description
The utility model computer megaphone belongs to a kind of voice device, especially belongs to a kind of megaphone.
At present, still do not have the computer megaphone on the market, more existing voice loudspeakers all are to add that by voice IC DRAM in addition constitutes voice system as memory, outage back information dropout.
But the purpose of this utility model just is to provide a kind of voice device of recording playback, and has power-down protection, and gives great volume, sound clarity, and noise is little.
For realizing the object of the invention, it is further specified below in conjunction with embodiment and accompanying drawing.
Fig. 1 is circuit theory diagrams.
Fig. 2 is a structural representation of the present utility model.
The structure of the utility model computer megaphone mainly is made up of shell 1, Electret condenser microphone 2, circuit board 3 and power supply 4, it is characterized in that circuit board 3 is made up of audio record circuit plate, signal processing circuit board and power amplifier plate three parts, it is connected to: the 1st, 2,3,5,6,12,13,26 pin of HY420 are ground connection all; C2 connects 78L05 the 3rd pin and ground respectively; R8 connects the 10th pin and 78L05 the 3rd pin of HY420 respectively; R7 connects the 9th pin of 78L05 the 3rd pin and HY420 respectively; R6 connects the 4th pin of 78L05 the 3rd pin and HY420 respectively; C21, C22 are connected in parallel on respectively between 78L05 the 3rd pin and the ground; R32 is connected in parallel between the 14th, 15 pin of HY420; C7, R11 are connected in parallel on respectively between the 27th pin of 78L05 the 3rd pin and HY420; Be connected between the 25th pin of 78L05 the 3rd pin and HY420 after L1 and the R12 series connection; R9 is connected in respectively between the 24th pin and 78L05 the 3rd pin of HY420; R10 is connected in respectively between the 23rd pin of 78L05 the 3rd pin and HY420; Be connected in respectively between the 20th, 21 pin of HY420 after R2, the C3 series connection; Be connected in respectively after R5, the C6 parallel connection between the 19th pin and ground of HY420; C4 is connected in respectively between the 18th pin and MIC-of HY420; C5 is connected in the 17th pin of HY420 and the positive pole of MIC respectively; R1 one end and 78L05 the 3rd pin, the other end link to each other with R3 with C1 is anodal respectively; R3 is connected between R1, C1 positive pole and the MIC+; R4 one end connects MIC-, and the other end connects the 25th pin of C1-and HY420; MIC-connects ground, MIC+ connects R15 and S2 normally-closed contact S2-4; R15 connects 78L05 the 3rd pin and MIC+ and S2 normally-closed contact S2-4 respectively; To be that double-pole is two put switch to S2, and S2-1, S2-2 are central contact; S2-4, S2-6 are normally-closed contact; S2-3, S2-5 are normally opened contact; S2-1 connects ground; S2-2 links to each other with C8+; S2-3 connects C19; C14 one end connects difference 14 pin of HY420; The other end links to each other with R19, R21; The 4th pin of LM324 connects 78L05 the 3rd pin, the 11st pin ground connection; R21 is connected between the 1st pin and C14 of LM324; R19 is connected between the 2nd pin and R21 and C14 of LM324; C15, R20 are connected in parallel between LM324 the 1st, 2 pin; R25 is connected in parallel between the 2nd, 8 pin of LM324; R24 is connected in parallel between LM324 the 8th, 9 pin; R23 is connected in parallel between the 9th, 14 pin of LM324; R22 is connected in parallel between LM324 the 1st, 13 pin; C16 is connected in parallel between the 13rd, 14 pin of LM324; The 3rd, 10,12 pin of LM324 all are connected between R26, the R27; R27 is connected in parallel between LM324 the 10 pin and the ground; R26 is connected in parallel between LM324 the 10th pin and 78L05 the 3rd pin; C18+ links to each other with LM324 the 1st pin; C18-extremely links to each other with the b of R28, R29, triode N1; Wherein N1 is 9014 triodes; R29 is connected between the b utmost point and ground of N1; R28 is connected between the b utmost point and 78L05 the 3rd pin of N1; R30 is connected between the c utmost point of 78L05 the 3rd pin and N1; R31 be connected in and the e utmost point of N1 between; C19 is connected between the c utmost point of S2-3 and N1; Potentiometer P1 central contact links to each other with C8-; P1 one end points links to each other with ground, and another end points links to each other with C9-, and C9+ links to each other with power amplifier TDA2003 the 1st pin; TDA2003 the 5th pin meets VC1+ (VC1+ is the 12V positive source), the 3rd pin ground connection, and R17 is connected in respectively between the 4th pin and C12-of TDA2003; C11+ links to each other with TDA2003 the 4th pin; C11-links to each other with loudspeaker SP1+; R16 be connected in after C17 connects SP1 positive and negative between; SP1-links to each other with ground; C13, C10 are connected in parallel between VC1+ and the ground; C30 is connected in parallel between 78L05 the 2nd, 3 pin; 78L05 the 3rd pin output+5V; The 2nd pin ground connection, the 1st pin meets VC1+; Its Electret condenser microphone, MIC, loudspeaker, SP1 are all with drawing circuit board.
The course of work: when the S1 disconnection, when S2-2 connected S2-4, can directly propaganda directed to communicate amplified.When the S1 closure, when S2-2 connects S2-4, begin recording, indicator light L1 is bright, and record length is the longest to be 20 seconds.When the S1 disconnection, S2-2 connects S2-3, when S2-1 connects S2-5, begin to play a record, but Infinite Cyclic.When connecting to s2-4, S2-2 stops playback, the state of directly propagandaing directed to communicate.
Since the utility model with HY420IC with than the high power amplifier logotype, and signal is handled by the circuit that LM324 forms, it is propagandaed directed to communicate gives great volume; sound clarity; noise is little, has power-down protection simultaneously, and institute's record information can be preserved information under powering-off state.Owing to adopt at E
2Direct modeling amount Storage Techniques (DAST) is saved digital memory among the POM, and data converter and stand-by power supply have low-power consumption, the zero energy storage, and information need not the dedicated voice development system, characteristics such as high-fidelity speech recording and reproducing.
The advantage of the utility model computer megaphone is: directly propaganda directed to communicate and recording/playing function; Circulation is put Recording, the longest record length 20 seconds; Power-off protection recording monitoring.
Claims (2)
1. computer megaphone of forming by shell (1), Electret condenser microphone (2), circuit board (3) and power supply (4), it is characterized in that circuit board (3) is made up of audio record circuit plate, signal processing circuit board and power amplifier plate three parts, it is connected to: the 1st, 2,3,5,6,12,13,26 pin of HY420 are ground connection all; C2 connects 78L05 the 3rd pin and ground respectively; R8 connects the 10th pin and 78L05 the 3rd pin of HY420 respectively; R7 connects the 9th pin of 78L05 the 3rd pin and HY420 respectively; R6 connects the 4th pin of 78L05 the 3rd pin and HY420 respectively; C21, C22 are connected in parallel on respectively between 78L05 the 3rd pin and the ground; R32 is connected in parallel between the 14th, 15 pin of HY420; C7, R11 are connected in parallel on respectively between the 27th pin of 78L05 the 3rd pin and HY420; Be connected between the 25th pin of 78L05 the 3rd pin and HY420 after L1 and the R12 series connection; R9 is connected in respectively between the 24th pin and 78L05 the 3rd pin of HY420; R10 is connected in respectively between the 23rd pin of 78L05 the 3rd pin and HY420; Be connected in respectively between the 20th, 21 pin of HY420 after R2, the C3 series connection; Be connected in respectively after R5, the C6 parallel connection between the 19th pin and ground of HY420; C4 is connected in respectively between the 18th pin and MIC-of HY420; C5 is connected in the 17th pin of HY420 and the positive pole of MIC respectively; R1 one end and 78L05 the 3rd pin, the other end link to each other with R3 with C1 is anodal respectively; R3 is connected between R1, C1 positive pole and the MIC+; R4 one end connects MIC-, and the other end connects the 25th pin of C1-and HY420; MIC-connects ground, MIC+ connects R15 and S2 normally-closed contact S2-4; R15 connects 78L05 the 3rd pin and MIC+ and S2 normally-closed contact S2-4 respectively; To be that double-pole is two put switch to S2, and S2-1, S2-2 are central contact; S2-4, S2-6 are normally-closed contact; S2-3, S2-5 are normally opened contact; S2-1 connects ground; S2-2 links to each other with C8+; S2-3 connects C19; C14 one end connects the 14th pin of HY420; The other end links to each other with R19, R21; The 4th pin of LM324 connects 78L05 the 3rd pin, the 11st pin ground connection; R21 is connected between the 1st pin and C14 of LM324; R19 is connected between the 2nd pin and R21 and C14 of LM324; C15, R20 are connected in parallel between LM324 the 1st, 2 pin; R25 is connected in parallel between the 2nd, 8 pin of LM324; R24 is connected in parallel between LM324 the 8th, 9 pin; R23 is connected in parallel between the 9th, 14 pin of LM324; R22 is connected in parallel between LM324 the 1st, 13 pin; C16 is connected in parallel between the 13rd, 14 pin of LM324; The 3rd, 10,12 pin of LM324 all are connected between R26, the R27; R27 is connected in parallel between LM324 the 10th pin and the ground; R26 is connected in parallel between LM324 the 10th pin and 78L05 the 3rd pin; C18+ links to each other with LM324 the 1st pin; C18-extremely links to each other with the b of R28, R29, triode N1; Wherein N1 is 9014 triodes; R29 is connected between the b utmost point and ground of N1; R28 is connected between the b utmost point and 78L05 the 3rd pin of N1; R30 is connected between the c utmost point of 78L05 the 3rd pin and N1; R31 be connected in and the e utmost point of N1 between; C19 is connected between the c utmost point of S2-3 and N1; Potentiometer P1 central contact links to each other with C8-; P1 one end points links to each other with ground, and another end points links to each other with C9-, and C9+ links to each other with power amplifier TDA2003 the 1st pin; TDA2003 the 5th pin meets VC1+ (VC1+ is the 12V positive source); TDA2003 the 3rd pin ground connection, R17 is connected in respectively between the 4th pin and C12-of TDA2003; C11+ links to each other with TDA2003 the 4th pin; C11-links to each other with loudspeaker SP1+; R16 be connected in after C17 connects SP1 positive and negative between; SP1-links to each other with ground; C13, C10 are connected in parallel between VC1+ and the ground; C30 is connected in parallel between 78L05 the 2nd, 3 pin; 78L05 the 3rd pin output+5V; The 2nd pin ground connection, the 1st pin meets VC1+; Its Electret condenser microphone, MIC, loudspeaker, SP1 are all with drawing circuit board.
2. computer megaphone according to claim 1 is characterized in that the inner E of employing of HY420
2PROM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96244882 CN2263429Y (en) | 1996-11-29 | 1996-11-29 | Computer megaphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96244882 CN2263429Y (en) | 1996-11-29 | 1996-11-29 | Computer megaphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2263429Y true CN2263429Y (en) | 1997-09-24 |
Family
ID=33918132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96244882 Expired - Fee Related CN2263429Y (en) | 1996-11-29 | 1996-11-29 | Computer megaphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2263429Y (en) |
-
1996
- 1996-11-29 CN CN 96244882 patent/CN2263429Y/en not_active Expired - Fee Related
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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 |