alarm door bell circuit using ic um 66 part 1

Posted on Feb 6, 2014

This is a slight modification of that circuit. In the previous circuit you have to keep the switch pressed for making the IC play the full music. Here if once the push button is pressed C1 is charged and the transistor Q2 will keep the IC playing the music till it ends. The time for the IC to play depends on discharging time of C1 which can be se

alarm door bell circuit using ic um 66 part 1
Click here to download the full size of the above Circuit.

t by R1. Set R1 to select your time, whether full tone or a part in one press. Transistor Q2 drives the speaker.

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