Hello, I have a question, what are the reasons for permanently high output from a monostable configuration of 555 timer?


I have this circuit activated by a clap, and the 555 output goes high after one clap and never goes low after that. Can you help me?

 

To start with, there is no DC reference potential on the + input to the 741. Also, the 741 output cannot swing all the way down to its negative power rail on pin 4, so Q1 night not be turning off.

ak

 

What's the voltage at the TR input (Pin 2) after the clap?