Hi guys,
I try to understand different writing styles of transformer-specs.
In many projects you use an 1:1 ratio transformer e.g. 600:600 ohms input or a 10k:10k interstage/bridging or step up/down transformers like 1:10 200:20kΩ mic input or 2:1 2400:600Ω output.
When I look on some Haufe-specs I´m kind of confused.
Attached you will find a RK744 datasheet.
Übersetzungsverh. meaning ratio is 1,4:1
Quellwiderstand meaning source resistance is 200Ω
Lastwiderstand meaning load resistance is 10kΩ
and then there is Impedanz meaning impedance which is 15kΩ at 40Hz
the transformer came out of a Neumann-EQ
What irritates me is:
I thought that turns ratio was corresponding to resistance-ratio.
Now I read 200Ω:10KΩ but 1,4:1 ratio. That lets me expect I was wrong.
or…
do I have to look at the reflected resistance on the primary? 10kΩx1,4=14kΩ
That is near to 15kΩ (listed impedance) so is the later just rounded?
Next point: why 200Ω? If its a EQ I have had assumed it has 10k or more input.
Are these 200Ω and 10kΩ just set values for testing the transformer and not the real-world values?
In my wishful thinking this transformer is a 15kΩ:10kΩ line-input with a voltage-ratio of 1,4 to 1
that I can use for line-level stuff like EQs and comps etc.
Can someone please explain how to read this data and/or if I am on the right way?
Thanks in advance,
Jan
I try to understand different writing styles of transformer-specs.
In many projects you use an 1:1 ratio transformer e.g. 600:600 ohms input or a 10k:10k interstage/bridging or step up/down transformers like 1:10 200:20kΩ mic input or 2:1 2400:600Ω output.
When I look on some Haufe-specs I´m kind of confused.
Attached you will find a RK744 datasheet.
Übersetzungsverh. meaning ratio is 1,4:1
Quellwiderstand meaning source resistance is 200Ω
Lastwiderstand meaning load resistance is 10kΩ
and then there is Impedanz meaning impedance which is 15kΩ at 40Hz
the transformer came out of a Neumann-EQ
What irritates me is:
I thought that turns ratio was corresponding to resistance-ratio.
Now I read 200Ω:10KΩ but 1,4:1 ratio. That lets me expect I was wrong.
or…
do I have to look at the reflected resistance on the primary? 10kΩx1,4=14kΩ
That is near to 15kΩ (listed impedance) so is the later just rounded?
Next point: why 200Ω? If its a EQ I have had assumed it has 10k or more input.
Are these 200Ω and 10kΩ just set values for testing the transformer and not the real-world values?
In my wishful thinking this transformer is a 15kΩ:10kΩ line-input with a voltage-ratio of 1,4 to 1
that I can use for line-level stuff like EQs and comps etc.
Can someone please explain how to read this data and/or if I am on the right way?
Thanks in advance,
Jan