The VAST majority of BYOC pedals are true mechanical bypass, using a 3PDT footswitch to physically disconnect the effect circuit from your signal path in bypassed mode. Additionally, this switching configuration turns an LED on or off to indicate that the pedal is engaged (on) or bypassed (off).
There are a few that use an electronic means of bypass called the "
millennium bypass" that uses FET-based electronic switching to isolate the effect circuit from your signal path. Very effective, but the switching requires that the pedal be powered, which is not the case with true mechanical bypass.
I'm probably forgetting one or two, but the only BYOC kit I can recall offhand that didn't use one or the other of these two bypass methods was the no-longer-offered Silver Pony. It stayed true to the original Klon Centaur design by incorporating an input buffer that was always in the signal path. This of course requires that the pedal always be powered in order to pass signal, whether engaged or in "faux bypass".
EDIT: One more non-TB BYOC pedal--the Soaring Skillet, which stays true to the original Ibanez FP-777 Flying Pan design.
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