Traditional Chinese Toddler Digital Teaching Recognizer (Workshop Practice) — Circuit, Wiring & Debug Guide
In short: Traditional Chinese Toddler Digital Teaching Recognizer (Workshop Practice) — Circuit, Wiring & Debug Guide. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 4667 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Number recognition device for young childrenThe digital recognition device can automatically display the numbers from 0 to 99, and can also be used in conjunction with the tape recorder to play the pronunciation of the numbers. How many times should each number be read before changing to the next number? It can also be changed in the range of 1 to 9 times. If you don't need a recorder to play the sound, you can use voice control input instead. At this time, every time a number is read or every time it is read, the digital tube will change a number. If you don't want to change one number every time you read it, you can also use the delay switch to select 1 to 9 delayed changes. Of course, it is also possible to use the built-in low-frequency oscillator to output pulses for digital conversion. In this case, there is no need for audio input.The specific circuit is shown in Figure 133. A total of 6 ICs are used, 5 of which are CMOS CD-type digital circuits. IC1 uses LM324, IC2 uses C04093, and IC5~IC6 use CD4511. The operating current of the whole machine does not exceed 70 mA when the digital tube is fully displayed. It can be powered by batteries in places where there is no AC power supply. This machine displays Arabic numerals from 0 to 99, using only two common cathode LED digital tubes. CD4511 is a decoding driver IC, and CD4518 is a dual-digital decoding driver IC. …
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