# Determine connections of a transformer based on resistance

I have a small transformer I desoldered from a disposable camera that transformed 1.5V to high voltage >90V. It has three leads on one side and two on the other. I have been testing its resistance and got the following measurements (*There is an error the resistance from connection 4 : 2 is 270 ohms not 3 ohms) The 3rd lead seems to be connected to the smaller coil but there is glue and I cannot figure out the other connections. Sorry for the really terrible solder joints (working on it).

• So when you test between any two pins you never get infinite resistance?? – Hot Licks Jan 24 '15 at 3:37
• Hello, I am glad someone revived this thread since I was never able to figure it out. There is infinite resistance between pins 3 and 4, 5 and 4. and between 1 and 3, 1 and 5, 2 and 3, 2 and 5. It seems a bit strange that the middle lead (pin 4) has a different resistance to pin 1 and pin 2 but between pin 1 and pin 2 they have the same resistance – AlanZ2223 Jan 25 '15 at 16:59
• I don't understand why you have 4:2 twice, with two different values. – Hot Licks Jan 25 '15 at 19:46
• 4:2 resistance is about 3 ohms – AlanZ2223 Jan 25 '15 at 21:05
• Then what does this mean: "(*There is an error the resistance from connection 4 : 2 is 270 ohms not 3 ohms)"? – Hot Licks Jan 25 '15 at 21:46