Adjustable Auto transformer

Posted on Apr 4, 2012

An isolation transformer and a variable auto transformer, very much like a Variac. Fuse 1 protects against gross overload. Lamp 1, across the Fuse 1, is a red incandescent pilot lamp and it lights up in the event of a blown fuse. Imagine how much time this would save when bringing up a stubborn power supply. Take note: Everything that can possibly come in contact with the user is connected to earth ground. in practice, I also have a earth leakage breaker dongle in series with this device.

Adjustable Auto transformer
Click here to download the full size of the above Circuit.

The circuit was carefully assembled using crimp connectors for all of the screw-down connections, with proper insulation via heat shrink tubing. All of the pieces of the steel and aluminum box were connected by bonding wire. All of the conductors were taken from 0.5 square mm lamp cord to assure the required dialectic strength. The earth leakage dongle (GFIC dongle) also passes the earth ground through to the output connector.

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