CN204576715U - A kind of piezoelectric type alarm - Google Patents
A kind of piezoelectric type alarm Download PDFInfo
- Publication number
- CN204576715U CN204576715U CN201520192392.6U CN201520192392U CN204576715U CN 204576715 U CN204576715 U CN 204576715U CN 201520192392 U CN201520192392 U CN 201520192392U CN 204576715 U CN204576715 U CN 204576715U
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- Prior art keywords
- pin
- amplifier
- resistance
- piezoelectric
- type alarm
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of piezoelectric type alarm, it is characterized in that: comprise piezoelectric sensor, described piezoelectric sensor connects input end 2 pin, 3 pin of amplifier IC respectively, be connected with 1 pin of amplifier IC after a branch road of 3 pin of described amplifier IC is connected in series with resistance R1,1 pin of amplifier IC is also connected with diode VD1 and loudspeaker simultaneously, be connected with power supply after another branch circuit parallel connections of 3 pin of described amplifier IC is connected with resistance R2 with RP1,4 pin, 8 pin of described amplifier IC are connected with power supply.The utility model structure is simple, reasonable in design, easy to carry, can be placed in documents pouch, handbag or wallet, plays the effect of burglar alarm, avoids the property of people to lose.
Description
Technical field
The utility model relates to a kind of piezoelectric type burglar alarm.
Background technology
In the middle of life now; society's labile factor exists everywhere; such as on crowded bus or when noisy market; often there will be the situation of stealing; and stolen person is often hard to guard against; cause harm therefore to the property of people, therefore need to design the burglar alarm that a kind of structure is simple, be convenient for carrying.
Utility model content
Utility model object: the purpose of this utility model is to solve deficiency of the prior art, provides the piezoelectric type alarm that a kind of structure is simple, be convenient for carrying.
Technical scheme: a kind of piezoelectric type alarm described in the utility model, comprise piezoelectric sensor, described piezoelectric sensor connects input end 2 pin, 3 pin of amplifier IC respectively, be connected with 1 pin of amplifier IC after a branch road of 3 pin of described amplifier IC is connected in series with resistance R1,1 pin of amplifier IC is also connected with diode VD1 and loudspeaker simultaneously, be connected with power supply after another branch circuit parallel connections of 3 pin of described amplifier IC is connected with resistance R2 with RP1,4 pin, 8 pin of described amplifier IC are connected with power supply.
As preferably, described piezoelectric sensor is piezoelectric patches, and diameter is 10 ~ 30mm.
As preferably, described amplifier IC is four-operational amplifier.
As preferably, the resistance value ratio of described resistance R1 and resistance R2 is 1:100.
Beneficial effect: the utility model structure is simple, reasonable in design, easy to carry, can be placed in documents pouch, handbag or wallet, plays the effect of burglar alarm, avoids the property of people to lose.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
A kind of piezoelectric type alarm as shown in Figure 1, comprise piezoelectric sensor 1, piezoelectric sensor 1 connects input end 2 pin of amplifier IC respectively, 3 pin, be connected with 1 pin of amplifier IC after a branch road of 3 pin of amplifier IC is connected in series with resistance R1, 1 pin of amplifier IC is also connected with diode VD1 and loudspeaker simultaneously, be connected with power supply after another branch circuit parallel connections of 3 pin of amplifier IC is connected with resistance R2 with RP1, 4 pin of amplifier IC, 8 pin are connected with power supply, wherein piezoelectric sensor 1 is piezoelectric patches, diameter is 10 ~ 30mm, be convenient for carrying, amplifier IC is four-operational amplifier, model is LM324.The resistance value ratio of described resistance R1 and resistance R2 is 1:100.
In the standby state, the output of piezoelectric sensor is low level to this device, and in-phase input end is pulled to Upper threshold voltage by feedback resistance R1, at this moment loudspeaker not sound; After piezoelectric sensor is touched by the of short duration contact of people, by the charge discharge easily stored, anti-phase input terminal voltage is made to exceed the voltage of in-phase input end, so IC exports step-down, in-phase input end drops to lower threshold voltage through R1, at this moment because input signal has not existed, the voltage of inverting input is low-voltage, IC is exported and becomes noble potential, loudspeaker sounds, and reminds owner to have people to steal.
Claims (4)
1. a piezoelectric type alarm, it is characterized in that: comprise piezoelectric sensor (1), described piezoelectric sensor (1) connects input end 2 pin, 3 pin of amplifier IC respectively, be connected with 1 pin of amplifier IC after a branch road of 3 pin of described amplifier IC is connected in series with resistance R1,1 pin of amplifier IC is also connected with diode VD1 and loudspeaker simultaneously, be connected with power supply after another branch circuit parallel connections of 3 pin of described amplifier IC is connected with resistance R2 with RP1,4 pin, 8 pin of described amplifier IC are connected with power supply.
2. a kind of piezoelectric type alarm according to claim 1, it is characterized in that: described piezoelectric sensor (1) is piezoelectric patches, diameter is 10 ~ 30mm.
3. a kind of piezoelectric type alarm according to claim 1, is characterized in that: described amplifier IC is four-operational amplifier.
4. a kind of piezoelectric type alarm according to claim 1, is characterized in that: the resistance value ratio of described resistance R1 and resistance R2 is 1:100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520192392.6U CN204576715U (en) | 2015-03-29 | 2015-03-29 | A kind of piezoelectric type alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520192392.6U CN204576715U (en) | 2015-03-29 | 2015-03-29 | A kind of piezoelectric type alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204576715U true CN204576715U (en) | 2015-08-19 |
Family
ID=53869321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520192392.6U Expired - Fee Related CN204576715U (en) | 2015-03-29 | 2015-03-29 | A kind of piezoelectric type alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204576715U (en) |
-
2015
- 2015-03-29 CN CN201520192392.6U patent/CN204576715U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150819 Termination date: 20160329 |