You rectify an AC signal and your getting 1.4 time more DC voltage. Don't think so.
You may be thinking of the 1.4v drops across the diodes. Your plused DC after a bridge is not greater. The Vpk x.707 or Vp-p x .3535. Is your RMS value.

I never heard of getting more? You have an AC sine wave it goes through two diodes so without the cap you will get identical positive pulsing (DC) peaks minus the drops of the diodes. The cap fills in the gaps between peaks to make it almost pure DC but reading that warning about voltage going high??

Got an example??
Need to learn something every day!

Even tell me how to see that with a scope and meter on machine would be great.

Thanks for your replies. I guess I am getting old and just never heard it presented that way. I kept thinking pk-pk like 18 vac off transformer that gets bridged to 6.3v. and or 120 v AC pk-pk that would be 42v. Not math trickery just a dummy that wasnt thinking as I should have. Carry on.

Still trying to enjoy LEDs myself. Just purchased a bunch from Art just before he sold. I must say I like them but lucky for me the pins I wanted to start with were Gottlieb the easiest out of them all to do. Everyone else seems to have issues. Like putting square peg in a round hole.