AMB Laboratories DIY Audio Forums

[Kernle 32DLL]

Hi,

As I'm slowly etching towards finally building my first β22 (3ch), I stumbled across ε12 and ε24 again, and wondered how to integrate them. As far as I can tell, the build could look like this:

A σ24 connects to the AC inlet, providing the 12VAC to the ε24. The ε24 in turn drives a 12V relay (ε24 note 1), which connects a ε12 and σ22 together. ε12 and σ22 in junction then connect to the β22 boards as detailed on the ε12 page.

Casing wise, I would put σ24, ε24 and its relay in the same case as the σ22, and the ε12 close to the β22 boards in their case. Sounds right?

Greetings from Germany.

[amb]

A σ24 connects to the AC inlet, providing the 12VAC to the ε24.

Correct.

The ε24 in turn drives a 12V relay (ε24 note 1), which connects a ε12 and σ22 together.

The first part is correct, but ε24 has nothing directly to do with ε12 or σ22. ε24 is merely a way to use a momentary pushbutton switch to act as the power switch for the machine. All its functionality is on the primary side of the main power transformer.

ε12 and σ22 in junction then connect to the β22 boards as detailed on the ε12 page.

The σ22 supplies power to the β22 boards as well as to the ε12.

Casing wise, I would put σ24, ε24 and its relay in the same case as the σ22, and the ε12 close to the β22 boards in their case. Sounds right?

Yes.

[Kernle 32DLL]

Hi,

okay, I now understand what to do with ε12, but I still have so problems with ε24:

The ε24 in turn drives a 12V relay (ε24 note 1), which connects a ε12 and σ22 together.

The first part is correct, but ε24 has nothing directly to do with ε12 or σ22. ε24 is merely a way to use a momentary pushbutton switch to act as the power switch for the machine. All its functionality is on the primary side of the main power transformer.

Not sure what you mean by "All its functionality is on the primary side of the main power transformer"? For me its not clear yet, which connection the ε24 operated relay should control. From what you wrote, I would guess the relay should be put between AC inlet and the σ22 toroidal?

[amb]

The 12V relay serves the purpose of turning the main power on and off (same as what a normal power switch does in a system without a ε24). Thus its "contacts" must be wired between AC mains "live" and one of the (σ22) power transformer's primary leads. The other primary lead connects to the AC mains "neutral".

The β24 power supply wiring diagram shown below serves as a good example of an ε24 application. This one has two main power transformers, both switched by a single ε24.

[Kernle 32DLL]

Ah, now it makes sense Thanks for the quick reply!