Photoshop - how to assign the background color transparent?

I use Photoshop CS5, and I have a black and white drawings to the trait (wiring diagram).  I want to put transparent white background in order to make schematic lines and paste them on a colored background.

I tried to use the magic wand tool, but he chooses only some parts of the background.  I want everything that is white, to be transparent.  In Paint Shop Pro, the order was simply to set the transparency of the a certain color palette and you were made.  However, I'm learning Photoshop, and I am simply unable to find a way to do it.

I guess this should be a simple task, because it is widely used in the graphics in the world, I don't know how to do it.

Any help would be appreciated.

Select > color - Select range: Highlights - click OK

If bottom, unlock layer by dragging the lock icon in the layer panel to the trash

Press the delete key

All white must now be transparent.

If not, post a screenshot with the layers panel open, so that we can try something else.

Tags: Photoshop

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