Electronics > Beginners
newbie question about transformer
Jed841:
ok i want to build this circuit http://kipkay.com/wp-content/uploads/2010/12/snip-burn-galley_Page_088.jpg BUT my transformer has an extra middle leg...... what is that for!? also when i hook 9v up to it, i get no voltage out the other side.......
Mechatrommer:
9v what? dc or ac?
williefleete:
its most probably a center tapping, if you have a multimeter test that pin to any of the others using the ohms range if it doesnt measure then its probably just for support when its on a PCB and open circuit
osmosis321:
Transformers need AC to work, a battery won't do the trick. It's the dv/dt, or the change in voltage, that transfers the power. That's why DC won't work, it's a steady voltage.
The middle wire is called the center tap. A center-tapped transformer is capable of push-pull operation and is commonly used in audio amplifiers.
Jed841:
ahhh i was using dc.... THNX!!! :D
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