本文介绍一种报晓电子鸟,能在清晨天刚亮时,发出优美的鸟叫声,且可持续10分钟。克服了同类电路叫声常鸣的缺点,既起到报晓作用,又能重现大自然的美妙之音。 电路原理 见附图,与非门F3、F4组成单稳定时电路,平时无低电平触发信号到F3的输人端时,F4输出高电平,三极管VT1截止,模拟鸟叫声的音乐集成电 This article describes an avatar electronic bird that emits beautiful bird sounds during the early morning hours and lasts for 10 minutes. Overcome the shortcomings of the similar circuit called often sound, both serve as a dawn effect, but also to reproduce the wonderful sound of nature. Circuit principle see the photo, NAND gate F3, F4 composed of single-stable circuit, usually no low-level trigger signal to the input side of F3, F4 output high, the transistor VT1 deadline, analog bird sound music integration Electricity