rafafredd
Well-known member
I´m trying my first transformer winding.
It´s a ribbon mic transformer in a permalloy toroidal winding. I´ve succeed in winding 865 turns into a toroid (Yes, hand random winding into a toroid, I did it) and I would like to know what should I use as a base for calculating the primary.
865 turns gives me a DCR of 16ohms and a little more than 2H inductance. Just perfect for a 150ohms microphone winding.
So, I can wind 29 turns secondary for a 1:30 transformer, or maybe go higher ratio and wind a 18 turn primary for a 1:50 ratio, or 1:70 who knows...
There is space for very large AWG wire for a very low DCR winding.
I would rather calculate how many turns would be good for the ribbon and let the ratio be a result of the needed primary vs the already winded secondary. It would be better than choose whatever turns ratio and end up with a too large or too small inductance primary winding.
So the simplified question:
What impedance / inductance does a regular ribbon wants to see at the primary of a ribbon mic transformer?
It´s a ribbon mic transformer in a permalloy toroidal winding. I´ve succeed in winding 865 turns into a toroid (Yes, hand random winding into a toroid, I did it) and I would like to know what should I use as a base for calculating the primary.
865 turns gives me a DCR of 16ohms and a little more than 2H inductance. Just perfect for a 150ohms microphone winding.
So, I can wind 29 turns secondary for a 1:30 transformer, or maybe go higher ratio and wind a 18 turn primary for a 1:50 ratio, or 1:70 who knows...
There is space for very large AWG wire for a very low DCR winding.
I would rather calculate how many turns would be good for the ribbon and let the ratio be a result of the needed primary vs the already winded secondary. It would be better than choose whatever turns ratio and end up with a too large or too small inductance primary winding.
So the simplified question:
What impedance / inductance does a regular ribbon wants to see at the primary of a ribbon mic transformer?