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star A.C. Devices
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star Isolation Transformer - Safer Power Supply ?
star Isolation Transformer
star MCB - For Testing
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star Testing Result 2016-5-14
star Testing Result 2014-7-27

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star Cambridge Audio
CA 351C
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star 5z3p 6n9p EL34
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Isolation Transformer
Part 2

After a long time of collecting and testing the materials, the isolation transformer construction is started.
Transformer Base Plate This is the base of the isolation transformer. I have to make some marks of the holes on the 3mm thick Aluminum Plate which is the base of the case of the isolation transformer.

Using a pencil to make some marks on the Aluminum Plate.

Hand Drill Stand For a better result of drilling, you can use the drill stand, the drill stand can keep the drilling perpendicular to the Aluminum Plate.
drilling holes on aluminum plate After drilling
After drilling, I have to enlarge the top of the holes for the countersunk screw. Since the speed of my electric drill is fixed, I have to enlarge the holes as the video shows:
countersunk screw / counter sunk screw

countersunk screw / counter sunk screw

Not bad ... ...

Part 2 finished

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12