3PDT Vs DPDT

[viruz4]

Hi, im building a pedalboard for a gcse project, and want to have all pedals wired for true bypass, as well as an LED to show if pedals are on or not. I could do this easily with a 3pdt switch, however I would like to know if i could with a dpdt, to save money.



The image shows a simplified version of what I plan to do using a DPDT switch, and i would like to know if this would work or cause any problems. Basically the earth wire form the guitar cable is wired straight through the pedal whether it is used or not, and the signal wire is switched on or off at the switch -  if it is on it is routed through the pedal, if off then it is routed to the amp directly. Perhaps i should say that i plan to leave the actual pedal on all the time and control it by using an external switch (shown on the diagram), allowing true bypass without modyfying the pedal.

Any help on this would be greatly appreciated.

Matt

[tiges_ tendres]

you would need to use a millenium bypass circuit, do a search and you will find a schematic

[viruz4]

ok so this wouldnt work but i could use a millenium bypass and get away with dpdt?

[Bagge]

You should read this great article from R.G. Keen.
http://www.geofex.com/Article_Folders/Millenium/millen.htm

[viruz4]

ok thanks, just one more thing, would this work?



I dont really have time to learn the millenium bypass, im new to all this and I'd like to learn if i could, but ill have to do that in future, I'm already behind with my project 

Thanks again for any help

[cd]

If you want true bypass with a reliable LED indicator, your ONLY option is a Millenium bypass.  You don't need to learn anything, just slap all the parts together (there are only 4) and solder.

[viruz4]

ok i'll do that, its confusing at the moment but im sure i'll work it out.

Thanks a lot for your help.

Matt

[Kræn]

Why don't you just get 3pdt's? They are only $6.25 a piece if you get two or more from this website. Much easier.

Christian

[niftydog]

it'll kinda work, but;

because the output of the effect is always connected, should there be any extraneous input noise going into the effect you will hear it regardless of whether the effect is "in the loop" or not.

switching the earths won't do anything really, you can keep them connected. Plus, in you're diagrams the earths are effectively never disconnected or switched, because they are joined together at the output and they have pure continuity through the pedal.

[R.G.]

viruz4, you've reinvented some of the history of bypasses.

You could save yourself some time and read "The Technology of Bypasses" at GEO (http://www.gefex.com) for the rest of it. If you do, I think you'll see some of the flaws that the others were referring to.

I admire your inventiveness in coming up with this on your own, warts or not.

[Mike Burgundy]

Thats http://www.geofex.com/

[R.G.]

Ur Uou syaing I kant spall? Aven mie own stuff?   

[Mike Burgundy]

Bless you.