CN208077480U - A kind of LED flicker frequency controllers being used for 555 IC design educations - Google Patents
A kind of LED flicker frequency controllers being used for 555 IC design educations Download PDFInfo
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- CN208077480U CN208077480U CN201820624533.0U CN201820624533U CN208077480U CN 208077480 U CN208077480 U CN 208077480U CN 201820624533 U CN201820624533 U CN 201820624533U CN 208077480 U CN208077480 U CN 208077480U
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Abstract
The utility model provides a kind of LED flicker frequency controllers being used for 555 IC design educations, belongs to Digital Electronic Technique field.The oscillating circuit of 555 integrated circuits composition is the key points and difficulties in Digital Electronic Technique course teaching, the utility model uses 555 IC design square-wave oscillator circuits, its frequency of oscillation is controlled by environment illumination intensity, and then realizes the function of intensity of illumination control LED flicker frequencies.This utility model is applied to the experimental teaching of 555 integrated circuits of Digital Electronic Technique course, the interest of experimental teaching can be participated in mobilizing students, improves teaching effect.
Description
Technical field
The utility model is related to a kind of LED flicker frequency controllers being used for 555 IC design educations, belong to digital and electronic
Technical field.
Background technology
In Digital Electronic Technique course, the oscillating circuit of 555 integrated circuits composition is the key points and difficulties in teaching, is
Proof theory teaching, school is mostly independent to be arranged to carry out replication experiment, and experimental result mainly passes through oscillograph observation oscillation
Waveform, uninteresting experimental result are difficult to attract the interest of student, and therefore, teaching efficiency is unsatisfactory.
Utility model content
In order to solve the problem above-mentioned, the utility model provides a kind of LED flicker frequencies being used for 555 IC design educations
Controller is realized the function of intensity of illumination control LED flicker frequencies, is tested by interest, and student is attracted to participate in 555 integrated electricity
The experimental teaching on road, to promote teaching effect.
The specific technical solution that the utility model is taken is as follows：
A kind of LED flicker frequency controllers being used for 555 IC design educations, it is characterized in that：The circuit packet of the controller
555 integrated circuit U1, resistance R1 and R2, capacitance C1, Light-emitting diode LED 1 and photo resistance LDR1 are included, wherein 555 integrated electricity
The one of the cathode ground connection of 8 feet and 4 feet of road U1, a termination+5V of resistance R1,1 foot and capacitance C1,2 feet and 6 foot connecting resistance R2
End, one end of photo resistance LDR1, capacitance C1 anode, the other end of 3 foot connecting resistance R2, the other end of photo resistance LDR1 and
The cathode of Light-emitting diode LED 1, the other end of the positive connecting resistance R1 of Light-emitting diode LED 1.
The beneficial effects of the utility model are：The utility model provides a kind of LED sudden strains of a muscle being used for 555 IC design educations
Bright frequency controller, is applied to the experimental teaching of 555 integrated circuits of Digital Electronic Technique course, makes originally dry as dust
555 experimental ics become more interesting, can with mobilizing students participate in experimental teaching interest, improve teaching effect.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Specific implementation mode
The utility model is described further below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of LED flicker frequency controllers being used for 555 IC design educations, the circuit packet of the controller
555 integrated circuit U1, resistance R1 and R2, capacitance C1, Light-emitting diode LED 1 and photo resistance LDR1 are included, wherein 555 integrated electricity
The one of the cathode ground connection of 8 feet and 4 feet of road U1, a termination+5V of resistance R1,1 foot and capacitance C1,2 feet and 6 foot connecting resistance R2
End, one end of photo resistance LDR1, capacitance C1 anode, the other end of 3 foot connecting resistance R2, the other end of photo resistance LDR1 and
The cathode of Light-emitting diode LED 1, the other end of the positive connecting resistance R1 of Light-emitting diode LED 1.
A side is formed by 555 integrated circuit U1, capacitance C1, resistance R2 and photo resistance LDR1 in the circuit of this controller
Wave oscillating circuit, frequency of oscillation depend mainly on the parameter of capacitance C1, resistance R2 and photo resistance LDR1；When illumination dies down,
The resistance value of photo resistance LDR becomes larger, and the resistance value after resistance R2 is in parallel with photo resistance LDR, which follows, to become larger, the charge and discharge of capacitance C1
Time constant is elongated, and the frequency of oscillation of the square-wave oscillator circuit of 555 integrated circuit U1 compositions reduces, and Light-emitting diode LED 1 flickers
It is slack-off；When illumination change is strong, the resistance value of photo resistance LDR becomes smaller, and the resistance value after resistance R2 is in parallel with photo resistance LDR is with covariant
Small, the charge and discharge electrical time constant of capacitance C1 shortens, and the frequency of oscillation of the square-wave oscillator circuit of 555 integrated circuit U1 compositions increases,
The flicker of Light-emitting diode LED 1 becomes faster, and then realizes the function of intensity of illumination control LED flicker frequencies.
Claims (1)
1. a kind of LED flicker frequency controllers being used for 555 IC design educations, it is characterized in that：The circuit of the controller includes
555 integrated circuit U1, resistance R1 and R2, capacitance C1, Light-emitting diode LED 1 and photo resistance LDR1, wherein 555 integrated circuits
The cathode of 8 feet and 4 feet of U1, a termination+5V of resistance R1,1 foot and capacitance C1 are grounded, one end of 2 feet and 6 foot connecting resistance R2,
One end of photo resistance LDR1, the anode of capacitance C1, the other end of 3 foot connecting resistance R2, the other end and hair of photo resistance LDR1
The cathode of optical diode LED1, the other end of the positive connecting resistance R1 of Light-emitting diode LED 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820624533.0U CN208077480U (en) | 2018-04-25 | 2018-04-25 | A kind of LED flicker frequency controllers being used for 555 IC design educations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820624533.0U CN208077480U (en) | 2018-04-25 | 2018-04-25 | A kind of LED flicker frequency controllers being used for 555 IC design educations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208077480U true CN208077480U (en) | 2018-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820624533.0U Expired - Fee Related CN208077480U (en) | 2018-04-25 | 2018-04-25 | A kind of LED flicker frequency controllers being used for 555 IC design educations |
Country Status (1)
| Country | Link |
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| CN (1) | CN208077480U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021069554A1 (en) | 2019-10-09 | 2021-04-15 | Trinamix Gmbh | Photoconductor readout circuit |
| WO2021152074A1 (en) * | 2020-01-30 | 2021-08-05 | Trinamix Gmbh | Photoconductor readout circuit |
-
2018
- 2018-04-25 CN CN201820624533.0U patent/CN208077480U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021069554A1 (en) | 2019-10-09 | 2021-04-15 | Trinamix Gmbh | Photoconductor readout circuit |
| WO2021152074A1 (en) * | 2020-01-30 | 2021-08-05 | Trinamix Gmbh | Photoconductor readout circuit |
| US11791424B2 (en) | 2020-01-30 | 2023-10-17 | Trinamix Gmbh | Device including photoconductor readout circuit for measuring differential voltages of a photoconductor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181109 Termination date: 20200425 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |