亚博竞彩APP

Electronic circuits that use the 555 Timer

555 Timer Circuits

555 Timers are fun and a great way to start learning electronics

POLICE SIREN Circuit

The Police Siren circuit uses two 555's to produce an up-down wailing sound. The first 555 is wired as a low-frequency oscillator to control the VOLTAGE CONTROL pin 5 of the second 555. The voltage shift on pin 5 causes the frequency of the second oscillator to rise and fall. 



Comment on this circuit or view the Electronic Circuits Community Forum.

乐优彩票天天红单下载 乐优彩票网址是多少 乐优彩票登入,备用,官方网址 乐优炫彩app下载 乐优炫彩app天天红单 乐优炫彩官网 乐博28app下载 乐八彩票 乐优炫彩彩票app下载 乐优炫彩app