Could some electronics guru please clarify thhe following ? For the 78xx series voltage regulators, does the ground pin have to be ground(zero) always ? To be more specific, I have successfully used the following setup: Step down(9 - 0 -9) xfrmr -> bridge rectifier -> positive output of bridge rectifier connected to pin 1 of a 7805 and the negative output of the bridgerectifier connected to the ground pin of the 7805. I get 4.99 volts (filtered with
8 capacitors) at the output pin of the 7805. No problems at all. If I try the same setup with a 9 - 0 - 9 output transformer, and the positive and negative ouput pins of the bridge rectifier connected respectively to the positive and ground pins of a 7815, I get zero volts output. I was wondering if my set up is incorrect, i.e., does the ground pin always need to be connected to 0 Volts ? All hints/suggestions are welcome. Thanks in advance.- posted
8 years ago