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star A.C. Devices
star A.C. EMI Filter
star A.C. Spectrum Verion 2
star A.C. Spectrum
star Digital Oscilloscope
star Flat Top A.C.
star Isolation Transformer - Safer Power Supply ?
star Isolation Transformer
star MCB - For Testing
star Relay - Power Failure Manual Reconnection System
star Soft Start Circuit
star Soft Start Circuit 2
star Tube Amplifier
5Z3P, 6N9P, EL34

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star AWG Vs mm

My AV System

star System Info.
star Testing Result 2016-5-14
star Testing Result 2014-7-27

Case Opening

star Cambridge Audio
CA 351C
star KEF Q300 Speaker


star 5z3p 6n9p EL34
Tube Amplifier DIY kit
star AudioQuest USB A-B Forest 1.5m
star B&W 685 S2 speaker
star WireWorld RCA Luna 7 1m

Other DIY

star Medeco Lock Replacement
star Vacuum Pump for RC Oil Damper

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Isolation Transformer
Part 7

This is the back of the bigger case.

The two square holes are standard design ... but, I do not want it.

American Style electric socket

I use two heat sinks to cover the 2 square holes.

The small round hole is installed the Fuse

"American Style" electric socket is from Copper Colour.

Fitting only, you have to install the wires before installing the sockets on the aluminum plate .... because of the stupid design of the "American Style" Electric Socket ... ... the wiring screws are on the left and the right sides. Therefore, you cannot loosen / tighten the screws when the electric sockets are installed parallel to each other.

Wiring complete ... the connector in white color is for connecting to the output of the Isolation Transformer.

I try my best to use 6 mm square wire for connection. Since this is HIFI related DIY project, thicker wire is always preferred.

Glue Gun

I use this glue gun to fix the wires in place. Since this is a DIY project, try and error is the key, I can remove / relocate the wires easily with glue, but not screw.

The Volt and Ampere Meter is installed on the front plate.

The input (red wires), Shielding (yellow wire) will be connected to the circuit in the smaller case.

After wiring, please check the connectivity ...

  • Correct connection - Live to Live, Neutral to Neutral

  • Short Circuit - e.g Live to Neutral ... must not shorted normally... but ... this is a transformer, you will find Live and Neutral are "short circuit".

  • Secure connection - try to shake the wires ... is it loose ?

If you are not familiar with electricity, transformer, ask for help before really connecting the equipment to the power.

Part 7 finished

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