I'll show you how to make this circuit step by step. You will need:
I'll show you how to make the printed circuit board for this.
Step 1: Making Print Board
First we will draw connections on board.Use a felt pen with acetone or nail polish.And a mixture for removing is using 12% hydrogen and hydrochloric acid.Then remove the paint with alcohol or acetone.
Step 2: Drilling Holes
When we remove the excess copper off the tiles we should drill holes where we later will put the elements.
Step 3: Putting Circuit Into Box
we put the elements on the board ,linking potentiometers, battery, input, output and the on off switch and then we put the board into a box.Fasten potenciomettre input and output switch on the box, connecting any battery, close the box and you are done making this circuit!good luck :)