hmm thanks guys.
well so that explaines the first phenomenon.. hv from the secondary when you apply and quickly remove current to the primary. so you need to make it sine wave input to just get the turns ratio votage.
and the hv generated in the primary, use a diode to handle it.
yeah back EMF, i think that is one of my problems. im using d cell batteries to go through tip122 which can switch 8 amps. this goes into a 150ma 12,12 ctap transformer. now im trying to make an inverter, i havent measureed the current from the secondary but im pretty sure its bugger all.. i assume the back EMF is stopping sufficient current from flowing through the primary. that is i doubt the full 8 amps is flowing. so i figured that ill just need a higher voltage to increase the current flow, but then ill get a higher voltage out of the secondary which i dont want, and ill hit the maximum voltage for the transitors too ( im already using 12v). so what do you do to get good current output from the secondary? ive looked at other peoples shematics and they basically are doing what im doing. 12 into a 12v 240v transformer