Supply power adapter

3D Model

It is a source of direct current I use in class. It was produced in 1964. It was supposed to transform an alternating voltage of 220V to 6 or 12 V of direct current. The voltage is not smoothed as there is no capacitor.

First you see the primary winding (1105 turns) and the fuse (2A).

Next you see the secondary winding. When the switch is in the left position the voltage generated by 30 inner turns between points A and B is taken. In the right position the voltage generated by 60 turns between points A and C is taken. You can check it.

The diodes of the rectifying bridge are mounted on the two plates insulated from each other by pink plastic. The plates help to cool the diodes. Pause the animation and study the way of the current (red and yellow arrows). A crossed arrow means that the current does not flow through a diode because it cannot go back to +. Notice that between the two top sockets the current flows always in one direction.