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Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Under the 25V option there are two red ports and the black port titled "COM" as I mentioned above.
The black port of the group labeled "6V" is simply the more negative of the two ports, and that's why it has a label "-". COM in this case means "common"; it's the ground for both of the red connectors next to it. Not the answer you're looking for?Browse other questions tagged power-supply or ask your own question.
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Select your preferred way to display the comments and click "Save settings" to activate your changes. Also keep in mind that the LM317 has sufficient cooling (heat sink) especially if you have low output voltage.With a 24VAC transformer you will get approx. I was explained to an extent that it was the ground associated with the ground of the building. If you require further details regarding the transaction data, please contact the supplier directly. If you were to measure the voltage between the two red terminals, it would be 50V; "COM" gives you a voltage in the middle. I know this is the port I ground to everyday when I use this but don't know why it's called "COM".

Voltages can be above or below this, or there can be no direct connection, in which case they are said to be "floating".
If the original transformer was rated for 12VA (or 500mA), then your substitute transformer should be rated at least as high.Your capacitors should NOT get hot.
Your first sentence says that you want to make this power supply, but it sounds like you already made it. Check all your connections carefully with the power off.Here is a very similar circuit shown with a 230V transformer.

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