Hi Chris, I have a tool by DJ5IL here which predicts around 60°C for the cores (excluding heat caused by the winding) and ca. 480 Gauss flux density. 73 Clemens DL4RAJ Attachment: 3xFT240-77_137kHZ.J
Hello Clemens, Thanks for the reply, the 3 stacked cores will rise to 70 degrees C plus even with a small computer processor fan blowing through them. I am investigating ways of reducing this, the co
For transformers the core is not terribly critical provided you use a grade of ferrite designed for the frequency of interest. And at LF that means SMPSU cores If I see a certain size core being use
Hello Andy, Thanks, I seem to have had some success using 3 X the number of turns and changing from 77 compound to 79 compound. I think I follow your formulae, as I say, maths is my very weakest poin
Hi Marco & Chris apologies for the delayed reply. There was indeed a typo. It should heave read 12.5Ohm because the amp is designed to work into a 50:4=12.5 Ohm load. Then there was another wrong ent
Hello Clemens, Thanks for the corrections, I did struggle a bit to get sensible results, but put it down to user error :) No worries! I have built a new combiner transformer on 3 off 78 material stac