Here is such a simple scheme.

 
Here is such a simple scheme. - Scheme, On-off button, Train, Longpost
Here is such a simple scheme. - Scheme, On-off button, Train, Longpost
Here is such a simple scheme. - Scheme, On-off button, Train, Longpost
Here is such a simple scheme. - Scheme, On-off button, Train, Longpost
Here is such a simple scheme. - Scheme, On-off button, Train, Longpost
Here is such a simple scheme. - Scheme, On-off button, Train, Longpost
Here is such a simple scheme. - Scheme, On-off button, Train, Longpost


v20240901