- Joined
- Jul 11, 2005
- Messages
- 146
Hi all, I am experimenting again. This time I found some nice nickel UU laminations and wound a test transformer for experimenting. the transformer has a 1:7 turns ratio (1000:7000 windings), split between 2 bobbins, interleaved windings (sec-pri-sec-pri-sec) and the two bobbins are connected in reverse to each other. when I measured the frequency response has a strange deep dip at around 20kHz. where does it come from? see picture...