I've built a simple adjustable voltage regulator, but running the ERC shows two errors:

The first one claims that PIN1 is not being driven (it's connected to GND through a resistor; the label is connected to a power pin, connecting the label directly without a resistor fixes the error). I can "fix" the warning with a PWR_FLAG.

The other problem is that the LM1117 family parts have a hidden 4 pin hidden below the 2 pin, both marked as "Power output", and this makes the ERC show an error of "ErrType(5): Conflict problem between pins. Severity: error. Pin 4 of U2 is connected to pin 2 of U2".

Simple vreg

Is it possible to fix this error?

  • 1
    \$\begingroup\$ You can configure one of the resistor pins as an output to supress the error. You can edit the schematic symbol for the regulator to explicitly show the duplicate pins. \$\endgroup\$
    – user57037
    Apr 27, 2017 at 6:13

1 Answer 1


The first one is a problem with the component. Adjustable regulators should not have the reference pin marked as power_in.

The second one is a known limitation, you can mark the hidden pin as power_in in the component as a workaround.

  • \$\begingroup\$ Good answer. Also, note that ERC shouldn't flag the second issue if both pin 4 and pin 2 have the same label ("VO" in this case) \$\endgroup\$
    – Seth
    Apr 27, 2017 at 16:13

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