To control stepping motors, the balance bridge power drive circuit is made up by TDA1521 integrated audio power amplifier, the pulse allotter is made up by the parallel ports of computer and latches.
The designed amplifier fabricates by 2um BiMOS.The characteristic of this process is add PMOS into general bipolar process, hence, the amplifier gets low cut off power consumption easily.
Sometimes it is said that discrete power amplifier design is rather unenterprising, given the enormous outpouring of ingenuity in the design of analogue ICs.
The EW technology he saw was not only pricier-American and European amplifiers are two to three times more expensive than the Chinese ones commonly found in Ukrainian kit-but also obsolete.
For users who are blind or have low vision, Detection Mode in Magnifier offers Point and Speak, which identifies text users point toward and reads it out loud, according to Apple.
据苹果公,于失明或低视力的用户,放大器的检测模式提供了 Point and Speak 功能,识别用户指向的文本并大声朗读。