TX102 tweak.. (Off Topic)

by soundcheck , Germany, Thursday, September 07, 2006, 18:02 (6435 days ago) @ Bert

Hi Bert.

Why should I remove the 0 lead from the attenuator switch? This means that
I do not have any output when done at that setting. Sometimes I do use that
setting though...

You're challenging me. :wink:

I was trying hard to find the thread at DIY-Audio, which explained it. Without success!
In the end I tried to figure it out by myself.

Here is my expalanation:

Autotransformer:
Basic principle/characterisitics: One winding. An extra tap is used as output. Galvanic separation is lost. But all windings are used. It's more a less a terminated transformer. (I wonder if that makes sense.)

Now my explanation: The only thing I see by looking at it. You'd short-circuit the primary!
Because the Input Voltage would be at the same size as the Output Voltage
on the 0db tap but the induced output Voltage would have the opposiste direction.
So the sum would be 0. Which is the basic roule of a transformer that
all Voltages and induced voltages sum up to 0.
That looks to me like a short circuit on the primary.

Does anybody have a better idea?

Klaus

Hi Klaus,

I do not have the +6db option connected.

Okay...

My input looks as it's supposed to be for a standard RCA connection:

++ hot (goes to 0db output lead)
-- connected to +
- cold (is connected to all other ground/shield leads)

So, you have the primary windings in series (+6dB as standard)?

Why should I remove the 0 lead from the attenuator switch? This means that
I do not have any output when done at that setting. Sometimes I do use that
setting though...

Ciao,

Bert

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