Switch brooch process

After making the platinum switch brooch there are a couple of thing that i need to refine. The springing action in the platinum one worked, but if it is attached to a jacket and pressing against the body, it might be more difficult to work. So this has to be addressed. so I am increasing the area of the spring in the brooch to obtain this ability. I am also placing a thin perspex rim around the key to try to help reflect the light better.
In the foreground of this first photo is the electronic latching switch or circuitry that I am putting into the brooch to make it work. I had to cut it down to fit into the key and re solder some of the terminals. I am trying to find out how to make these circuits, but no one is able to tell me what IC (integrated Circuit) is used, or what alternative to use. So for the moment I'm going to have to continue cannibalising safety bands for cyclists.
We spoke today in our class discussion about the process in which we come up with a new idea. I realised that i never finish a piece and then start to try think of a new design. I am always working on more than one thing at a time, and when I get to a point in a piece when I get stuck, usually on a technical aspect, I move on to one of the other pieces. When I come up with a way to sort out the problem of the first piece, I go back to it.