JPS5926027B2 - Correct answer confirmation device in group reaction analyzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a group reaction analysis device in which a correct answer signal determined by a parent unit is fed back to a correct answer confirmation display means such as a light emitting diode built in a slave unit of each correct answer respondent, so that only the student concerned can receive the correct answer signal. This device is related to a device that confirms the correct answer, and is capable of giving a correct answer confirmation signal only to each person who answered correctly, regardless of whether it is a two-wire device in which the parent device and the child device are connected by two wires. be.

In a collective reaction analyzer, a large number of slave units are connected to one base unit, so it is desired that the number of wires between the base unit and each slave unit be as small as possible, and a two-wire system is preferred. .

However, with the two-wire system, it is difficult to provide feedback to each student as to whether or not their answer was correct. Conventionally, a common lamp panel such as a blackboard was provided and each lamp was assigned to each student. Because the number of correct answers was displayed on the screen, it was inconvenient for everyone to know the number of correct answers, and there was no certainty that each person could make a mistake.

The present invention provides a switching circuit for a light emitting diode interposed between the connection lines of a slave unit connected to the first and second connection lines from the base unit, by the correct answer output of the correctness determination circuit of the base unit. When activated, the polarity of the connection line is switched to produce a light-emitting display, and the drawbacks of the prior art are solved by a relatively simple circuit.

The invention will be explained below with reference to the figures.

R(a-n) is a child device, P is a parent device, and a reply processing circuit P(a-n) is provided in the parent device corresponding to each child device.

In addition, the error display circuit and other auxiliary circuits are omitted in the figure. The handset R is equipped with a resistance value switching circuit A, which is known per se, having option answer switches 51 to 55 for switching resistance values R, ~R, and a correct answer confirmation display having a light emitting diode DF in parallel with the switching circuit. A circuit F is connected and configured. One of the common terminals of each slave unit is connected to the first line Li, and the other common terminal is connected to the second line Li.
Connected to line L2.

CS is a changeover switch provided on the first line Li, and its a contact is grounded, and its b contact is connected to a DC power supply +V. VP is a voltage setting circuit that outputs a predetermined voltage stepwise by correct answer setting switches P1 to P5;
G is a correctness determination circuit to which the correct answer voltage and the answer signal from the second line are input, and outputs a logic "1" when the answer is correct, and outputs a logic "O" when the answer is incorrect. Therefore, the correct/incorrect judgment circuit G in this embodiment is a MOS type 1C
A diode D1 is connected between both input terminals of an exclusive OR circuit EX (hereinafter abbreviated as EX-0R) composed of , a second line is connected to the cathode side terminal b.

In this embodiment, the switching resistors R1 to R5 of the slave unit switch the response switches S1 to R5 of the slave unit for each correct answer voltage set by the correct answer setting switches P1 to P5 of the voltage setting circuit VP.
The value is selected such that when S5 corresponds (that is, a correct answer), an input voltage is applied to both input terminals of EX-0R with the threshold voltage (judgment level voltage) sandwiched therebetween.

As a result, when the a terminal voltage a is equal to or higher than the threshold voltage and the b terminal voltage Vb, which has a potential difference equal to the voltage drop d due to the diode D1, becomes equal to or lower than the threshold voltage, E
The logic output of X-0R becomes "1" to determine the correct answer.
In the above example, due to the action of the diode D1, a<b
Since there is no such input relationship, the input voltage relationship that produces a correct output is limited to the above case, and when the voltage across Ab is simultaneously above the threshold value or below the threshold value, both are logic "0".
In other words, an incorrect answer is output.

In addition, Z is the protective constant voltage diode of EX-0R, R2
is a protection resistor of diode D1.

C is a capacitor that serves as a correct answer output holding circuit, and EX
-0R correct output voltage is maintained. D2 is a discharge blocking diode, and D3 is a wraparound prevention diode, both of which are connected to the terminal of the first line. B is MOS type 1
This is a buffer in which inverters connected by C are connected in series, and the output thereof lights up a light emitting diode Y for displaying a correct answer and turns a transistor T, which serves as a switching element, into an ON state.

The collector of the switching transistor T is connected to the second line L2. Next, the operation of the circuit of the present invention will be explained.

First, the changeover switch is as shown in the figure, and the first line L
1 is connected to the ground line, and on the base unit side, the correct answer setting switch for that correct answer number, for example P3, is turned on and a predetermined voltage is output from the voltage setting circuit VP.

The correct/incorrect judgment circuit G in the present invention has logic "1" only when the answer is correct.
As described above, in this case, an output is generated to the determination circuit only when the response switch S3 of the slave unit is pressed.

This output is held by a capacitor C, passes through a buffer circuit B, and lights up a correct answer display element Y. After everyone has answered, the switches P and S are released and the changeover switch CS is switched to connect the first line L1 to the DC power supply +V. As a result, a DC voltage is applied to the light emitting element DF of each child device, but the person who answered incorrectly does not emit light because the switching transistor T is non-conductive. However, for those who answered correctly, the switching transistor T is made conductive by the voltage held by the capacitor C, causing the light emitting element DF of the child unit to emit light. This allows only those who answered correctly to confirm that their answer was correct.

[Brief explanation of the drawing]

The figure is a circuit connection diagram of the device of the present invention.

Claims (1)

[Claims] 1. In a two-wire collective reaction analyzer in which a slave unit having a choice answer switch is connected to a master unit by two wires, a first line and a second line, the first line and the second line in each slave unit are A light emitting element for confirming a correct answer is connected between the second lines, the first line is connected to a ground terminal and a DC power supply via a changeover switch, and the second line is a correct/incorrect judgment circuit that outputs logic "1" only when the answer is correct. The correct/incorrect judgment circuit is connected to an input terminal and connected to a switching circuit whose one end is grounded, and the correct/incorrect judgment circuit is configured with a circuit for holding the correct answer output, and when the first line is a ground line, the output from the slave unit is Upon receiving the answer signal, the correct/incorrect judgment circuit operates and holds the correct answer output, and when the first line is switched to a DC power supply, the correct answer signal from the correct answer holding circuit is input to the switching circuit. A correct answer confirmation device in a group reaction analyzer, characterized in that the light emitting element of the child unit turns on and causes the light emitting element of the slave unit to emit light to confirm and display the correct answer to a correct answerer.