ML-99YD type "Nine-Nine Multiplication Table"

"Nine-Nine Multiplication Tables" ML-99YD digital voice circuit has the characteristics of compact size, saving power, many external interfaces, easy expansion and clear pronunciation standards. It is very conducive to the promotion of Mandarin and early childhood and primary school education, and at the same time it is good for improving children's Interest in learning. It can play a positive role in reducing teachers' labor intensity and correcting inaccurate pronunciation. ML-99YD pin arrangement: Circuit schematic: As shown in the figure, it is powered by a 3V~5V DC power supply and has a total of "0-9". 10 numeric keys (the "0" key doubles as the "music" key) and the "rhythm/note selection" key and the "rhythm practice" key, a total of 12 keys. The audio signal output end is connected to an external transistor amplifier circuit. Directly drive the 8Ω/0.25W speaker to work.