CN2160963Y - Mathematics teaching board - Google Patents

Abstract

The utility model relates to a large amount of storage, convenient to use's primary school mathematics teaching board, the student of being convenient for improves mental arithmetic speed through a large amount of, the exercise of being rich in the calculation subject of change, strengthens brain thinking ability, student's intellectual development with higher speed. The mathematics teaching board consists of LED digital symbol display screen, decoding circuit, data storage circuit, addressing inquiry circuit and answering circuit, and features its memory IC₉Storing arithmetic data, IC₉Data line D₀～D₇Darlington transistor F connected with level conversion circuit₄～F₁₁，F₄～F₁₁Output receiving/sending decoding circuit IC₁～IC₈，IC₉Address line A of₀～A₁₄Direct connection with switch K₉～K₁₂And a counter circuit IC₁₁～IC₁₂The output ends are connected.

Description

Board for teaching mathematics

The utility model relates to a kind of electronics teaching aid that is used for primary school math teaching, is a kind of mathematical education plate specifically.

At present, mainly be blackboard still as the primary school mathematics teaching aid, be aided with picture and digital card.The teacher adopts and writes on blackboard, card is composed and laid out and imparted knowledge to students.There is following shortcoming in such teaching aid: 1, the teacher must write on related content on the blackboard (or paper) before the class.Collect sum, copy, over-burden in prepare lesson; 2, on the classroom, the teacher is used for writing time of topic on blackboard too much, influences the explanation of teacher to the student, is unfavorable for that student's understanding is accepted; 3, because, the content that can write out on the blackboard is less, and is difficult for variation, is unfavorable for that the student calculates the raising of ability soon; 4, present " arithmetic recreation " popular in primary school (being commonly called as the recreation of " 24 " point) all carried out among a small circle by the Piao Ke board, be difficult for it and introduce supplementary means (the so-called arithmetic recreation of classroom as the arithmetic teaching, be will be arbitrarily 4 be no more than 10 number, by arithmetic, allow its result equal 24, require each number to use once, and must use once).

The purpose of this utility model is the problem at above-mentioned existence, and it is big to have designed a kind of storage capability, primary school math teaching plate easy to use, be convenient to the student by exercises a large amount of, changeful arithmetic problem, improve mental arithmetic speed, strengthen the exercise of human thinking ability, quicken student's intelligence development.

Solution of the present utility model:

A kind of by LED mathematic sign display screen, decoding scheme, the data-storing circuit, the addressing enquiry circuit is raced to be the first to answer a question the mathematical education plate that circuit is formed, and it is characterized in that in the data-storing circuit with semiconductor read-only memory IC ₉The data of storage arithmetic formula, IC ₉Data line D ₀～D ₇Meet level shifting circuit Darlington transistor F ₄～F ₁₁, F ₄～F ₁₁Output pick decoding scheme IC ₁～IC ₈, IC ₉Address wire A ₀～A ₁₄Directly and K switch ₉～K ₁₂, and counting circuit IC ₁₁～IC ₁₈Output terminal is connected.

Race to be the first to answer a question IC in the circuit ₁₀Data line input end D ₁～D ₄Connect K switch ₁₈～K ₂₁, diode D ₁₇～D ₂₀Negative pole meet IC respectively ₁₀D ₁～D ₄, diode D ₁₇～D ₂₀The common public point of positive pole meet Sheffer stroke gate YF ₁～YF ₄The power supply Vss utmost point, IC ₁₀DOL Data Output Line Q ₁～Q ₄Meet code translator IC respectively ₁～IC ₈()/(LT) end.

Mathematical education plate described in the utility model is that a kind of storage capability is big, novel teaching aid easy to use, and it mainly contains following advantage: 1, the arithmetic formula weight of storage is big in the teaching aid, helps the student by a large amount of exercise tap intellectual resources.Teacher when 2, using has reduced the time that the teacher writes as long as one, two switch of operation just can obtain new sum on blackboard, help strengthening explanation, concentrates student's notice, improves teaching quality.3, changed fundamentally in the past that the teacher writes arithmetic problem when preparing lessons, blackly analysed the way of copying, reduced the loaded down with trivial details work of a lot of repetitions toward little.Helping the teacher is placed on energy in the research of teaching method.4, this teaching aid has the function of arithmetic recreation, and like this, the teacher can carry out the arithmetic recreation the student of classroom inner tissue by this teaching aid, improves the ability of student's arithmetic, promotes the cultivation of student's competitive spirit, collectivity consciousness.

Fig. 1 is the utility model electrical schematic diagram.

Below in conjunction with accompanying drawing the utility model is further described:

1, S ₁～S ₁₁Be LED numeral, symbol display, they are at seven sections decoding IC ₁～IC ₈Under the driving of the brilliant pipe of Darlington, can demonstrate +/-+/-the such arithmetic formula (is the number of 00-99) of=.As seen from the figure, operation K ₁～K ₇Just can determine that whether the numeral corresponding with switch, symbol show, same sum can be developed into several roads sum, for example, can develop into for +=? +=, ()=, +?=, +=?

2, storage IC ₉Be one to have the read-only memory of 15 bit address lines, its address A ₀～A ₁₄Respectively by IC ₁₃, IC ₁₂, IC ₁₁And K ₉～K ₁₂Etc. addressing (inquiry) the circuit control that relevant elements is formed, F ₄～F ₁₁Be Darlington transistor, its effect is with IC ₉The level of data is converted to+12V-OV by OV-+5V, IC ₉()/(CE), ()/(OE) be connected into " reading " state.

For the teacher can seek out the formula of each teaching phase easily, to IC ₉During programming, its address code is divided into several zones, all kinds of formula classification are stored in the different zones.The method of dividing is:

A ₁₄=0 stores the content of a last term;

A ₁₄=1 stores the content of a next term;

A ₁₃=0 A ₁₂=0 A ₁₁The formula of=0 storage-=type;

A ₁₃=0 A ₁₂=0 A ₁₁The formula of=1 storage +=type.

A ₁₃=1 A ₁₂=1 A ₁₁The formula of=1 storage + +=type.

Wherein: A ₁₃=1 A ₁₂=0 A ₁₁=0

A ₁₃＝1 A ₁₂＝0 A ₁₁＝1

It is 24 4 numbers that storage all can obtain by arithmetic.

A ₁₀～A ₇Four address line combination become 16 different states, deposit the formula with each teaching phase in each state respectively in.For example, concerning last term, can be divided into 5～20 totally 16 teaching phase, be, the formula in this 16 stage is deposited in successively in 0000～1111 these 16 states in programming by the book of teaching.For next term, also its content can be divided into 16 stages, deposit IC successively in ₉In.

5 address wire A ₆～A ₂Form 32 different conditions, can deposit 32 road formulas.A ₀, A ₁Two address wires are formed one of four states, deposit one two figure place under each state in, and four two figure places have just been formed formula one.

3, addressing (inquiry) circuit: IC ₁₁Be level Four scale-of-two reversible counter, IC ₁₂Be seven grades of binary counters, IC ₁₈Be decade counter, they and K ₉～K ₁₇And the related resistors diode forms addressing circuit jointly, and the effect of addressing circuit is to leave IC in ₉In the arithmetic formula seek out as required for decoding and showing.

During use, at first stir K ₉～K ₁₁, carry out the selection of arithmetic formula type, then, carry out the selection of teaching phase: press K ₁₅, IC ₁₁, the counting, Q ₁～Q ₄Change state with per second 1～2 time." M " is IC ₁₁Make the control end of addition or subtraction, K ₁₄Setting be for reduce the inquiry be the time.K ₁₆, K ₁₇Be to change the topic button, press K ₁₆, change topic p.s. 1～2 time, press K ₁₇, change 10～20 IC of topic p.s. ₁₃Be decade counter, at YF ₅, YF ₆The multivibrator of forming is made cycle count under driving, and makes A ₀A ₁Two address wires can present four different states.C ₁～C ₄, R ₇₇～R ₈₀, D ₅～D ₈, R ₆₇～R ₇₀Form four differentiating circuit, its effect is to leave A in ₀A ₁4 two figure places of four different conditions are latched in respectively in separately the code translator, and principle of work as shown in the figure.IC for example ₁₃" 1 " bring out existing noble potential, other output terminals " 2 "～" 0 " is electronegative potential, at this moment IC ₉A ₀=0, A ₁=1.Work as IC ₁₃When next CL step-by-step counting, " 1 " current potential is jumped down, and " 2 " terminal potential rises, this moment A ₀=0, A ₁=1 state is constant.When " 1 " terminal potential is jumped down, in the differentiating circuit current potential of the negative pole of D6 by+it is OV that 5V jumps, D ₆It is ≈ 1V that anodal current potential is jumped down by original+12V, leaves A in ₀=0, A ₁Number in=1 address location is latched at IC ₁, IC ₂In, in like manner other three two figure places also are latched at IC successively ₃～IC ₈In.The number average that is latched shows on the mathematics display of correspondence.

4, race to be the first to answer a question the principle of work of circuit: work as K ₉Closure, K ₁₀Disconnect.K ₁₁Closed disconnection, K ₂, K disconnects K ₃Closure just can begin " arithmetic " recreation.Recreation people operation button (K separately ₁₈～K ₂₁), strive for answering power.Racing to be the first to answer a question circuit is by four D latched flip flop IC ₁₀, YF ₁～YF ₄, K ₁₃～K ₂₁And F ₁₂Deng composition, in a single day the player finds out the method for arithmetic, press the button immediately, this moment hummer FM sounding, corresponding with it numeral shows flash " 88 ".According to the position of " 88 ", first presses the button just can whom to determine, thereby can determine who obtains to answer power, for example, and K ₁₈Take the lead in pressing IC ₁₀Middle D ₁Electronegative potential latch Q ₁The output electronegative potential, diode D ₂₀OV just very, the YF that is attached thereto ₁～YF ₄Vss obtain electronegative potential, multivibrator work, FM sounding, diode D ₁The negative pole current potential with YF ₃The square wave oscillation of output, S ₁S ₂On flash " 88 ", like this, press K ₁₈The player just obtained to answer power.Because IC ₁₀The effect of latching, as long as K ₁₈Press and do not decontrol, other buttons are all inoperative, like this, guaranteed that first robs the answer power that touches the button.K ₁₈After the relieving, display screen no longer flashes " 88 ", and FM is sounding no longer.

Claims (2)

1, a kind of by LED mathematic sign display screen, decoding scheme, the data-storing circuit, the addressing enquiry circuit is raced to be the first to answer a question the mathematical education plate that circuit is formed, and it is characterized in that with using semiconductor read-only memory IC in the data-storing circuit ₉The data of storage arithmetic formula, IC ₉Data line D ₀～D ₇Meet level shifting circuit Darlington transistor F ₄～F ₁₁, F ₄～F ₁₁Output pick decoding scheme IC ₁～IC ₈, IC ₉Address wire A ₀～A ₁₄Directly and K switch ₉～K ₁₂, and counting circuit IC ₁₁～IC ₁₃Output terminal is connected.

2, mathematical education plate according to claim 1 is characterized in that racing to be the first to answer a question IC in the circuit ₁₀Data line input end D ₁～D ₄Connect K switch ₁₈～K ₂₁, diode D ₁₇～D ₂₀Negative pole meet IC respectively ₁₀D ₁～D ₄, diode D ₁₇～D ₂₀The common public point of positive pole meet Sheffer stroke gate YF ₁～YF ₄The power supply Vss utmost point, IC ₁₀DOL Data Output Line Q ₁～Q ₄Do not meet code translator IC ₁～IC ₈()/(LT) end.

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