Practical Human Reaction Velocity Gauge: Traditional Chinese Circuit D

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Human reaction speed measuring instrumentReaction speed is one of the basic physiological qualities of human beings. Practice has proved that this quality can be gradually improved through acquired training.The reaction speed measuring instrument can quantitatively measure a person's reaction speed. This quality of a person can be exercised and improved through instruments, making the person being tested more alert. In other words, the instrument can stimulate - conduct - decide - actionThe signal transmission time in this physiological feedback chain is greatly shortened.The use of this instrument can play an active role in the selection of talents. For example, scientific data can be provided when selecting young sports athletes, dance, acrobatics, magic students and other training targets that require alertness.The circuit diagram of the measuring instrument is shown in Figure 1-1. It consists of control switch, reaction indicator, time relay, delay network, source follower and measuring bridge.The first function of the measuring instrument is to test the visual reaction time of the subject using the stimulation of three colors of red, green and blue light. First, set the switch S3 to a certain position, that is, select a certain color light as the test signal. During the test, let the subject press button S1 first, and the light will not light up. After a certain period of time (this period is adjustable), the light starts to light up, and then the subject is asked to release button S1 immediately. The pointer of the microammeter PA indicates the time of the subject's visual reaction.The working principle of the circuit in Figure 1-1 is: VT1, VT2 and thyristor VS1 form an electronic delay relay. When the test button S1 is pressed, the short circuit of C1 is removed, charging starts, and the delay relay starts working. Due to the delay effect of the delay relay, when S1 is pressed, VS1 is not conducting and its anode voltage is close to the power supply voltage. At this time, C2 is not charged and the light does not light up.After a delay (the length of this period is determined by the values of capacitor C2 and RP1+R1), the charging voltage of C1 increases, VT1 is turned on, VT2 is turned off, the thyristor VS1 is turned on, the anode point A is close to the ground potential, and one of the bulbs H1~H2 lights up. At this time, C2 also starts charging immediately, and the charging circuit is DC→C2→R4, VT3→S1→VS1→ground. Since the size of the charging current is determined by the constant current source VT3, it is constant. So the voltage on C2 grows linearly. As the voltage on capacitor C2 increases, the potential applied to the gate of control tube VT4 decreases, and its source voltage changes with the gate voltage. Field effect transistors VT4, R5, R6 and RP2 are used to form a measuring bridge, and a pointer microammeter is connected to the diagonal of the bridge. When capacitor C2 charges, the bridge loses balance and the voltmeter pointer deflects. The indication angle of the watch hand is proportional to the charging time of C2. Therefore, the time from when the subject sees the light on to when he releases button S1 is the charging time of capacitor C2, and then the meter indication value is the subject's reaction time.Two situations may occur during the test: if the subject releases S1 at the moment when the delay relay flips, the pointer will not deflect; if the subject releases S1 before the delay relay flips, the charging process of C2 cannot occur, and the microammeter still has no indication. This is all the result of the person being tested trying to get good results and taking action in advance before the light comes on. The instrument will not recognize this.Figure 1-1After completing a test, press the reset button S2. At this time, the bulb goes out and VS1 turns off due to loss of maintaining current. At the same time, capacitor C2 is discharged through VD1 and the bulb, and the circuit returns to its initial state, ready for the next test.Before testing, adjust RP2 to make the voltages at both ends of the meter equal, that is, adjust the meter needle to zero.When testing the auditory response, an additional circuit should be installed on the measuring instrument. The circuit is shown in Figure 1-2. This circuit can emit audio signals so that when testing the auditory response, a normally open contact needs to be added to the test switch S1.Figure 1-2When S1 is pressed, current flows from the positive electrode through the bulb, the contact of S1, R8, and then enters the control electrode of VS2, and VS2 is turned on. So connect the negative terminal of the battery to the emitter of VT6. The emitter of transistor VT5 is connected to point A through D3 and connected to the positive terminal of the battery through the light bulb. At this time, the audio oscillator is temporarily not working, because the base of the first stage VT5 of the oscillator is connected to the socket 4 terminal, point A, through the normally open point of VD2 and S1, and the voltage at this point is the same as the positive voltage of the power supply, so VT5 is cut off. Only after a certain delay, VS1 turns on and the potential at point A drops, VT5 turns on, and the oscillator works and sounds.The tone of the oscillator can be changed by changing the capacity of C3.Finally, it should be noted that during testing, the average of no less than five test results should be taken as the test value. The delay time and light color of each test must be different, and the preset status should not be seen or guessed by the subjects, so that such results can be real. Multiple tests can significantly improve the subject's reaction speed and make them appear agile when doing other activities. …

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