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该电路能够给您的孩子提供十分有意思的乐趣。它可产生警笛声、鸟鸣声、飞船声等等,此外,它还能用作门铃、报警并具有成本价廉,制作简单等优点。工作原理该电路由四部份组成:1.二进制计数器;2.D/A转换器;3.压控振荡器;4.缓冲数大器。计数器的速率取决于压控振荡器的频率,而压控振荡器的状态又
This circuit can give your child great fun. It can produce sirens, birdsong, spacecraft, etc., in addition, it can be used as a doorbell, alarm and has the advantages of low cost, simple production. Working principle The circuit consists of four parts: 1. Binary counter; 2. D / A converter; 3. Voltage-controlled oscillator; 4. Buffer number amplifier. The rate of the counter depends on the frequency of the VCO and the state of the VCO