Thank you for the positive feedback, because for me it is important to see if you see it that way.
My mine model has a real role model in my place of residence. It is important to me to set this as natural as possible. Since it is a visitor mine, in which also functions of mining are demonstrated, I would like to do this in my model so. This will include a pit guide / miner who explain the place to the visitors and demonstrates the function.
In the original, the meaning of the historic place is explained underground and pulled the mine car with a reel from the tunnel. All this should also happen in my model. For this I need a sound module for the explanation and the noise of the moving mine car. Of course, this has to happen synchronously with the model's procedure. To realize all this I started to install the electronics.
Since everything has to fit into the 8 X 8 X 6 inch Cakebox for the challenge, that's not all that easy. For the power supply is a battery pack with 12 volts installed, but that can be switched on and off via a switch. In addition, the switch has another position in which an external power supply can be turned on. This is the first time the power supply is secured.

The central control of all processes is carried out by a Dinamo OC32-NG. This is a freely configurable sequence control system for model railroads with 32 I / O inputs and outputs. Since I have a resistance bank in the first bank, I can use it as an input, servo output or to drive a Led. I am already in a model making servo with which I would like to move the mine car. Since such a servo also requires 5 volts, there is the additional board SP04, which suppresses the servo signal and is responsible for the 5 volt power supply. But I also need 5 V DC for the AVT sound module which I also connected to the SP04.

Everything can be triggered later by the viewer himself by pressing the button on the front itself. In addition, there is a board with relays that serve security and exclude incorrect operation. Because even if the start button on the front is pressed several times, it must not come to any malfunction.
I have begun to wire the cable, but only finally complete the wiring when the servo is firmly mounted.