Optical True Bypass

 I found this one on FuzzDogUk's website. Its a neat way to use DPDT switches for true bypass and still get the indication LED. This is totally doable via the Millennium Bypass family of circuits but I just thought this was an easy project to do. Who doesn't like options.

 

Tap On Tap Off True Bypass

I started experimenting with some 9volt relays recently and this was the obvious first circuit. A means of turning on and off/bypassing effects via a momentary 'soft switch'. There's a few other methods of accomplishing the same feat though using slightly more complicated circuitry and/or parts. The 555 timer is cheap and readily available due to its vast uses. Any relay should suffice, I've tried 3 separate brands and all have function accordingly.

Topsy-Turvy True Bypass

This is a weird one. A means of turning on an effects pedal/circuit via.....gravity? The circuit utilizes mercury/tilt switches in place of the typical mechanical throw switch, and takes place of the 3PDT footswitch in most pedals. When the entire circuit board is parallel to the earth or flipped 180 degrees on its 'x' axis (upside down), the secondary circuit will either be ON w/LED or in TRUE BYPASS. I've used mercury switches in the past to make SPDT, DPDT, and 3PDT switches using 2, 4, and 6 individual mercury switches respectively. I doubt many people, if any, will build this as its simply not very useful. Just a cool project.