CN204808713U - Digital circuit tests external member based on element circuit - Google Patents
Digital circuit tests external member based on element circuit Download PDFInfo
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- CN204808713U CN204808713U CN201520516444.0U CN201520516444U CN204808713U CN 204808713 U CN204808713 U CN 204808713U CN 201520516444 U CN201520516444 U CN 201520516444U CN 204808713 U CN204808713 U CN 204808713U
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Abstract
The utility model provides a digital circuit tests external member based on element circuit, digital circuit experiment external member includes the element circuit of a plurality of independent functions, all be equipped with corresponding external contact pin on the element circuit of a plurality of independent functions, the element circuit passes through external contact pin is connected. The utility model discloses make student's ability autonomic learning digital circuit, utilize unit circuit design to go out different digital system, realize different functions, do benefit to expansion student's thinking, deepen the understanding to digital circuit.
Description
Technical field
The utility model relates to a kind of Digital Electronic Technique field, particularly relates to a kind of digital circuit experiment external member based on element circuit.
Background technology
Digital Electronic Technique course is the compact course of theory and practice.Student, after the theoretical course of study of numbers electronic technology, needs by the course such as digital circuit experiment, course design of Digital Electrocircuit, or passes through the content of the proof theory course such as opening experiment platform, electronics Creative Lab.In study, if only have theory and do not test, student is just difficult to get a real idea of learned course, especially for some abstract theories, can make its dramatic, image, easy understand more by experiment.
At present, in Digital Electronic Technique course learning aid process, Problems existing has:
1, in the learning process of this course, the student really benefiting from opening experiment platform is limited.Although opening experiment platform provides to student and puts into practice space as far as possible flexibly, the engineering practice innovation ability tool improving student is of great significance.But laboratory carries normal teaching task and Course Exercise link, and student also has normal course arrangement, freely arranging the time of student really can be supplied to less.And opening experiment to a certain extent difficulty is comparatively large, student generally or can only enter the Course Exercise stage and just likely really independently tests in the course later stage.Further limit the effect of opening experiment like this.Equally, electronics Creative Lab is more useful for higher grade pupil.Therefore, for Electron Technique Course, need the reform carrying out more effective mode of learning, to provide a kind of student can the platform of really " autonomous learning ".
2, the resource that various auxiliary student carries out learning compares the principle of work and analytical calculation that lay particular emphasis on circuit.As, each school's superfine course construction project, utilizes the network teaching platform of school, can provide the contents such as webpage study course, Teaching video recording, teaching courseware, key to the exercises, on-line testing to student.But for needing engineering technical ability that just allow student's acquistion practicality by the mode of " starting ", that be difficult to statement, only having and allowing student really start to put into practice and could obtain.
3, the relation progressively setting up element circuit and system is difficult to.For Digital Electronic Technique, each element circuit is an independently circuit, and having a complete function, is also a part for whole system.Element circuit, in learning process, is regarded as an independently circuit by student more, instead of as a part of system.Only in comprehensive example or the Course Exercise link in course later stage, just start the concept of system of setting up.
Because of school curricula arrangement, when learning section, needing the element circuit studying this part, also will expand etc. element circuit; When finishing most of element circuit, just need to study digital display circuit, digital display circuit is made up of multiple element circuit, but the time less of student experimenting, and student just can only test in laboratory, the time and space is all restricted, so the experiment external member designing this patent solves these problems.
Summary of the invention
The technical problems to be solved in the utility model, be to provide a kind of digital circuit experiment external member based on element circuit, digital circuit is decomposed into various typical element circuit, and the experiment external member of range site circuit design digital electronic system, study and practice that Digital Electronic Technique just can be carried out in laboratory can not relied on.
The utility model is achieved in that
A kind of digital circuit experiment external member based on element circuit, described digital circuit experiment external member comprises the element circuit of a plurality of standalone feature, the element circuit of described a plurality of standalone feature is equipped with corresponding external contact pin, and described element circuit is connected by described external contact pin.
Further, the element circuit of described a plurality of standalone feature comprises supply socket, priority encoding circuit, logical function generator, data selection circuit, data allocation circuit, data comparison circuit, full adder, half adder, parity checker, coding display circuit, electronic switch, flip-flop circuit, button disappear twitter circuit, clock generating circuit, monostable circuit, Schmidt trigger, counting circuit, shift circuit, register, A/D convertor circuit, DA change-over circuit, hummer, logic pen and running lamp circuit.
Further, described supply socket is standard Micro-USB interface.
The utility model has the advantage of:
1, each element circuit is both corresponding with the chapter of Digital Electronic Technique course, occur with the form of a part for system again, element circuit organically can be combined into an entirety or fractionation, is conducive to student and sets up the important engineering concept such as " system ", " integrated "." element circuit ", at " system " learning " element circuit ", can expand to different " system " again by student easily, deepens student to the understanding of " system " and " element circuit " mutual relationship;
2, each element circuit provides the interface of expansion, and namely external contact pin, utilizes wire, can realize the expansion of element circuit, as used two identical experiment external members, 3-8 logical function generator is extended to 4-16 logical function generator;
3, same, utilize wire, also element circuit can be combined into the digital display circuit of difference in functionality;
4, digital display circuit generally only needs logic pen or multimeter namely can carry out the experimental analysis of being correlated with.Therefore, experiment external member completely can directly be received by student or use, and is not limited to the experiment porch of school, does not take the teaching resource of school.
Accompanying drawing explanation
The utility model is further described with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is the structural representation of a kind of digital circuit experiment external member one instantiation electrical combination (multichannel low level warning circuit) based on element circuit of the present utility model.
Fig. 2 is the circuit theory diagrams of ternary logical function generator.
Fig. 3 is the circuit theory diagrams that ternary logical function generator is extended to four variable logical function generators.
In figure: 1-priority encoding circuit, 2-ternary logical function generator, 21-3-8 decoding scheme, 22-two four input nand gates, 3-hummer, 4-one digit number code pipe, 5-display decoding scheme, 6-double figures code pipe, 7-two display decoding schemes, 8-cascade two integrated counters, 9-clock generating circuit, 10-trigger, 11-button, 12-logic pen, 13-USB socket.
Embodiment
A kind of digital circuit experiment external member based on element circuit of the present utility model, described digital circuit experiment external member comprises a circuit board (being of a size of 10cm*10cm), described circuit board is provided with the element circuit of a plurality of standalone feature, described digital circuit experiment external member comprises the element circuit of a plurality of standalone feature, and the element circuit of described a plurality of standalone feature comprises supply socket, priority encoding circuit, logical function generator, data selection circuit, data allocation circuit, data comparison circuit, full adder, half adder, parity checker, coding display circuit, electronic switch, flip-flop circuit, button disappears twitter circuit, clock generating circuit, monostable circuit, Schmidt trigger, counting circuit, shift circuit, register, A/D convertor circuit, DA change-over circuit, hummer, logic pen and running lamp circuit, the element circuit of described a plurality of standalone feature is equipped with corresponding external contact pin, described external contact pin draws along the pin of the components and parts on described functional unit circuit that (described external contact pin is as expansion interface, the external constrained input pin of drawing from the pin of the components and parts described functional unit circuit), described element circuit is connected by described external contact pin, as: this experiment external member can by as described in external contact pin and wire or short circuit cap element circuit as described in the function not of the same race in this experiment external member is connected, form the digital display circuit with difference in functionality, or by described external contact pin and wire, the described element circuit of the function of the same race in this experiment external member a plurality of is expanded.
Before detailed description the utility model specific embodiment, first introduce the common elements circuit in digital circuit.
In digital circuit, common elements circuit has: priority encoding circuit, logical function generator, data selection circuit, data allocation circuit, data comparison circuit, full adder, half adder, parity checker, coding display circuit, flip-flop circuit, clock generating circuit, monostable circuit, without mu balanced circuit, counting circuit, shift circuit, register, A/D convertor circuit, DA change-over circuit, digital regulation resistance (can be used for the voltage-transfer characteristic of Test integration chip port) etc.An actual digital display circuit, can be made up of multiple element circuit.
Below in detail the utility model is described in detail, a kind of preferred embodiment of the digital circuit experiment external member based on element circuit:
Refer to Fig. 1, Fig. 1 is multichannel low level warning circuit, comprise multiple element circuit: priority encoding circuit 1, ternary logical function generator 2, hummer 3, one digit number code pipe 4, display decoding scheme 5, double figures code pipe 6, two display decoding schemes 7, cascade two integrated counters 8, clock generating circuit 9, trigger 10, button 11, logic pen 12, USB socket 13, described ternary logical function generator 2 comprises 3-8 decoding scheme 21 and two four input nand gates 22, described priority encoding circuit 1 respectively with described 3-8 decoding scheme 21, a described display decoding scheme 5 and described cascade two integrated counters 8 connect, described 3-8 decoding scheme 21 is connected to described hummer 3 by described two four input nand gates 22, a described display decoding scheme 5 is connected to described one digit number code pipe 4, described cascade two integrated counters 8 respectively with described trigger 10, described clock generating circuit 9 and described two display decoding schemes 7 connect, described button 11 is connected to described trigger 10, described double figures code pipe 7 is connected to described two display decoding schemes 6.The described USB socket 13 of described experiment external member is that employing standard Micro-USB interface is for power supply (the i.e. charger for mobile phone interface of standard, the USB interface of computing machine or charger for mobile phone can provide the direct supply of 5V/500mA, the requirement that namely most of Miniature digital system tests external member can be met), the described logic pen 12 of this experiment external member can level in test circuit, the state of decision circuitry.
When all short circuit cap connected in Fig. 1 is connected, experiment external member, as a complete digital display circuit, realizes the function of " multichannel low level warning circuit ".When to be designed to outside input any road of 0-7 be low level, priority encoding circuit 1 will be encoded, and drive hummer 3 by ternary logical function generator 2, when also to can be designed as any four tunnels be low level, be reported to the police by hummer 3; Meanwhile, by the one digit number code pipe 4 of " code displaying " by external alert sequence number the highest for display priority; Priority encoder 1 makes cascade two integrated counters 8 start counting simultaneously, the clock signal of cascade two integrated counters 8 is provided by clock generating circuit 9, and driven the double figures code pipe 6 of " displaying time " by two display decoding schemes 7, the time that display alarm continues.After alerting signal is cancelled, the twitter circuit that disappears consisted of button 11 and trigger 10, provides reset signal to cascade two integrated counters 8, count value is reset.
Hereafter describe in detail, for ternary logical function generator, element circuit concrete form is described.
Refer to Fig. 2, Fig. 2 is the circuit theory diagrams of ternary logical function generator, comprise 3-8 decoding scheme 21 and two four input nand gates 22, the chip that described 3-8 decoding scheme 21 adopts the chip of 74LS138 model, two four input nand gates 22 adopt 74LS20 model.Wherein A, B, C, E1, E2, E3, Y0, Y1, Y2, Y3, Y4, Y5, Y6, Y7 of 74LS138 chip all pick out external contact pin.Short circuit cap in Fig. 2 connects, and namely realize the logical function that input variable is A, B, C, function expression is: Y=CB ' A '+C ' BA+C ' B ' A+C ' B ' A '.
Element circuit in this experiment external member keeps independence, and when taking off short circuit cap, namely corresponding element circuit separates with digital display circuit, can test separately and expand.Refer to Fig. 3, student can utilize two pieces of these experiment external members, and the ternary logical function generator that a 74LS138 chip and 74LS20 chip are formed is expanded to four variable logical function generators.The m8-m15 minterm of the corresponding four variable logical functions of Y0-Y7 difference of the 74LS138 chip in experiment external member B, compare with Fig. 2, the short circuit cap that E1, Y3, Y4 pin cancelling 74LS138 chip in experiment external member A connects, utilizes wire logical variable D to be received the E1 pin of 74LS138 chip; In experiment external member B, A, B, C of 74LS138 chip access logical variable A, B, C respectively, E1 and E2 pin is through short circuit cap ground connection, wire is utilized logical variable D to be received the E3 pin of 74LS138 chip, and Y8 and Y9 of 74LS138 chip in experiment external member B is received the 11st and the 10th pin of 74LS20 chip in experiment external member A respectively, its logical functional formula is: Y=DC ' B ' A+DC ' B ' A '+D ' C ' B ' A+D ' C ' B ' A '.
Each element circuit provides the interface of expansion, utilizes wire, can realize the expansion of element circuit, as ternary logical function generator is extended to four variable logical function generators, also element circuit can be combined into the digital display circuit of difference in functionality.Based on the utility model, utilize experiment external member and simulation software, student does not rely on place of specifically imparting knowledge to students, can autonomous learning digital circuit, student range site circuit design can go out different digital display circuits, realize different functions, be beneficial to the thinking of expanding student, deepen the understanding to digital circuit.
Although the foregoing describe embodiment of the present utility model; but be familiar with those skilled in the art to be to be understood that; specific embodiment described by us is illustrative; instead of for the restriction to scope of the present utility model; those of ordinary skill in the art, in the modification of the equivalence done according to spirit of the present utility model and change, should be encompassed in scope that claim of the present utility model protects.
Claims (3)
1. the digital circuit experiment external member based on element circuit, it is characterized in that: described digital circuit experiment external member comprises the element circuit of a plurality of standalone feature, the element circuit of described a plurality of standalone feature is equipped with corresponding external contact pin, and described element circuit is connected by described external contact pin.
2. a kind of digital circuit experiment external member based on element circuit as claimed in claim 1, it is characterized in that: the element circuit of described a plurality of standalone feature comprises supply socket, priority encoding circuit, logical function generator, data selection circuit, data allocation circuit, data comparison circuit, full adder, half adder, parity checker, coding display circuit, electronic switch, flip-flop circuit, button disappears twitter circuit, clock generating circuit, monostable circuit, Schmidt trigger, counting circuit, shift circuit, register, A/D convertor circuit, DA change-over circuit, hummer, logic pen and running lamp circuit.
3. a kind of digital circuit experiment external member based on element circuit as claimed in claim 2, is characterized in that: described supply socket is standard Micro-USB interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520516444.0U CN204808713U (en) | 2015-07-16 | 2015-07-16 | Digital circuit tests external member based on element circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520516444.0U CN204808713U (en) | 2015-07-16 | 2015-07-16 | Digital circuit tests external member based on element circuit |
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| Publication Number | Publication Date |
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| CN204808713U true CN204808713U (en) | 2015-11-25 |
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| CN201520516444.0U Expired - Fee Related CN204808713U (en) | 2015-07-16 | 2015-07-16 | Digital circuit tests external member based on element circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107507495A (en) * | 2017-09-12 | 2017-12-22 | 中国电子科技集团公司第四十研究所 | A kind of modularization teaching experimental method based on signal link |
-
2015
- 2015-07-16 CN CN201520516444.0U patent/CN204808713U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107507495A (en) * | 2017-09-12 | 2017-12-22 | 中国电子科技集团公司第四十研究所 | A kind of modularization teaching experimental method based on signal link |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151125 Termination date: 20190716 |
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| CF01 | Termination of patent right due to non-payment of annual fee |