get the latest 8 records laravel 5.1

How can i get the latest 8 votes on this query by mobile number field:

results = DB::table('votes')->whereIn('votes.id', function($query){
                    $query->select(DB::raw('MAX(id) as id'))
                    ->from('votes')
                    ->groupBy('mobile_number', 'position_id','code');
                })->where(array('code'=>$code,'position_id'=>$positionId))->get();

on this query it gets the latest total votes of the users but not limited to 8.

->where(array('code'=>$code,'position_id'=>$positionId))->take(8)->get(); //it seems this is not working

here's the sample table

id  mobile_number   code    position_id
1   123123          1       1
2   123123          1       1
3   321212          2       2
4   123123          1       1
5   123123          1       1
6   123123          1       1
7   123123          1       1
8   123123          1       1
9   123123          1       1
10  123123          1       1

if i get the votes of 123123 it will get only the latest 8 so on the above table the Id 1 will not be included in the results.

Any idea? Thanks

via Chebli Mohamed