Traditional Chinese Practical Infant attention trainer: Circuit Design, Parts List & Workshop Prototype Guide

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Infant and toddler attention trainerThis device applies sound and light stimulation from different directions to infants and young children to improve their attention to things, accelerate the improvement of their auditory and visual systems, and promote the development of their brains.Circuit working principle:Figure 123 is a diagram of the working principle of the circuit. The time base circuit IC1 (ICM155) constitutes an astable multivibrator with an oscillation period of about 2 to 9 seconds, which can be changed by adjusting RP1. Its ③ pin output is connected to the high-level trigger terminal TR+ of the analog sound circuit IC2 and the clock input terminal CP of the counter IC3, providing trigger and clock pulses for IC2 (KD5608) and IC3 (74HC4017).The audio signal output by the analog sound circuit IC2 is amplified by VT1, VT2 and VT3, and drives the speaker and small light bulb to emit sound and light. Potentiometers RP2 and RP3 are used to adjust the intensity of sound and light. IC3 and VT4 ~ VTn form a multiplexer switch, used to switch speakers and small light bulbs. The output terminals Y0~Y9 of IC3 can be arbitrarily combined through diodes to drive two to three pairs to ten pairs of speakers and light bulbs.Debugging and use:After the circuit is connected, connect the 3V DC power supply and the circuit will start working. At this time, a pair of speakers and light bulbs will sound and light up. Adjust RP2 and RP3 to make the speaker volume and light bulb brightness moderate, and adjust the resistance of RP1 to the maximum to maximize the cycle period. Then place three or four pairs of speakers and light bulbs around the baby. You will find that the baby starts to look around, and finally stares at the small flashing light bulb. Eight or nine seconds later, another pair of speakers and light bulbs make sound and light up, and the baby looks elsewhere. At first, the baby may not be able to do this and is indifferent to it. At this time, you can adjust RP2 and RP3 to appropriately increase the sound and light intensity, but it should be based on what the baby can perceive. Do not make it too loud or too bright to avoid damage to the health of the baby. When the baby adapts, you can adjust RP1 to gradually shorten the cycle to improve the baby's reaction speed.After the baby can crawl, you can add a few more pairs of speakers and light bulbs, and arrange them in a straight line or a large circle, so that the speakers and light bulbs emit sound and light from near to far, and the baby will crawl along with the sound and light. At this time, you can adjust RP1 to find the appropriate moving speed of sound and light. If the analog sound circuit is properly selected and the sound is interesting, the baby will crawl and laugh at the same time, which is great fun.You can also use speakers or light bulbs alone to train your baby's auditory and visual attention respectively. If you have kittens or puppies at home, you can also use this device to entertain them.Component selection:The speaker can be 8Ω, 0.1W, …

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