以下为句子列表：
英文: The limitations of Schmitt toggle circuit, composed of 555 timing circuit, is discussed, a improved Schmitt toggle circuit is given, and proved by using theory and experiment.
中文: 摘要论述了常用555定时器构成的施密特触发器电路的局限性，给出了施密特触发器的改进电路，并用理论和实验加以证明和验证。
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