Dicodes has an app note for building TC coils on their website. I built using NiFe and their instructions. Works like I think it should. TC can be wonky if you don't do it exactly correct. Their instrucions worked for me. Welcome to the Dicodes world!
Thanks for the reply! Could you point me to the instructions you used? I can't seem to find anything on their site except a .pdf but it's in German only.