help to understand a simple electronic circuit, then to improve it

hello i am trying to understand how an electronic circuit works, and what it does, what it produces. i have only a basic understanding of electronics and of components... i have managed to draw a schematic, with a photo of each component, and how they are connected to each other. i need help to understand what each part of the circuit does, and what it produces (output). here is the handdrawn schematic : [login to view URL] your job, if you accept it, will be : - to help me to understand what each part of the circuit does and what it produces (ouptut), and also to correct it if there is an error somewhere. - to provide a simulation of the circuit in your favorite simulation software (i use [login to view URL]) (a few screenshots or a short video capture, with written explanations or with spoken explanations, is enough) - to provide a list of the components necessary for this circuit. (so your bid and proposal is for that) once all these steps completed, i will release the milestone. and after that we will discuss for others steps / milestones, because i need help to create a similar circuit, with some modifications, according to my needs. but i prefer to work on one small step / milestone at a time.. if you have a question, don't hesitate to ask... thanks for your interest in this project, regards,