How to make a huge powerful transistor with your own hands

One day, for one of my projects I needed a powerful mosfet. A large current of about 500 Amperes had to be switched. And then the idea came to mind to make a separate transistor, modular, composite.
From low-power mosfets it was necessary to assemble one powerful one. Fortunately, these transistors are well arranged and work perfectly if they are connected in parallel to each other.

Will need

• Transistors - 50N06 - 12 pieces -
  
• Metal adhesive, cold welding -
  
• Epoxy resin.
  
• Textolite board for installation.
  
• Flux and solder.

The process of making a powerful transistor with your own hands

We make the board using any available method.

We etch it in ferric chloride and then rinse it well.

We solder the technological jumpers and tin the board tracks.

We solder the field-effect transistors. This compound transistor uses 12 mosfets of the 50N06 series in a TO-252 package. All parts are connected in parallel without any correction circuits.


The contacts are made of thick copper wire.

Before soldering, you can temporarily connect thick wire with thin wire and then remove it.

We wash the board from flux.


We glue the base of the contacts with epoxy resin.


We cut out a heat-conducting substrate for the transistor from a thick sheet of aluminum.

We drill a hole for future mounting on the radiator.

We “plant” the board on heat-conducting glue - cold welding.


To give full visibility to the transistor, we will make a housing for pouring from plexiglass.

Mix epoxy resin in the proportion indicated on the instructions.

Fill in the form. and leave to dry.

We remove the plexiglass body.

Almost ready to do it.

All that remains is to apply the markings. Let's do this with a laser.

We rub the indentations with paint.

The power MOSFET transistor is ready for use.

Watch the video