Mk115 explanation

I just built a mk115 vu-meter. Since I’m a beginner at this type of electrical circuits I wonder exactly how it works. What does the transistors do and what does the capacitors do?
If someone could explain in detail it would be very helpful and appreciated.


Sorry, but this question is out of the scope of a forum. You are asking a complete course in electronics. We can’t provide that on a forum unless someone here is having very much spare time …

I just wonder how the transistors and capacitors works in this circuit, not in general. I already know the basics.