It is important for machine ... power transformer consists of two or more coils of wire connected by a shared magnetic core. The device commonly contains two wire coils: the primary winding ...

Those readers who have experimented with winding their own inductors will ... by creating the windings for a switch-mode power supply transformer using stacked PCB coils instead of wire (Russian ...

That leaves the problem of powering the heaters for the tubes, which is usually the job of a second 6- or 12-volt winding on a power transformer. Luckily, the surplus market has a lot of little 6. ...