true bypass AND batery bypass with a dpdt switch

[the_stig]

Hello,

I am trying to figure out a way how to get both true bypass and battery bypass using a dpdt switch. With a 3pdt this would be very easy, unfortunately in this part of the globle they're unobtainium (for reasonable money).

I've done a bit of research and couldn't find a complete solution. Could someone give me a hint what to type into google for a starting point?

Philip

[GREEN FUZ]

Millennium bypass ?

[Roobin]

What do you mean by 'battery bypass'? Do you mean taking the battery out of the circuit, so it's only connected when the effect is engaged? Unfortunately, whenever you disconnect/connect the battery in a circuit, you can hear a 'pop' - unless you had a very large capacitor storing what would effectively be 9v, so that when the battery is reconnected there is a much smaller voltage difference, and the pop may be less audible. I've never done this, so I'm just theorising, but it may be worth a try.

As for the switching itself, you would need (assuming you go for normal and battery bypass) some sort of JFet switching system, similar to what Boss uses (except theirs relies on a momentary switch to do the flip-flopping) (EXCEPT I just realised you want true bypass, and a JFet system some may view as not being a proper true bypass, so you could try mini relays, which would provide a true bypass.  However, then the problem arises that their current draw whilst switching may be a little large, thus defeating the point of a battery bypass); and for the battery bypass, you could use the switch itself to switch the battery in/out. You could also use that half of the switch too make a slow turn on switch for the battery, so that the voltage rise is gradual, and not very quick and large. Couple this with a large storage capacitor, and you have a possible solution. However, you then might also want a LED indicator, which complicates things a little more...

Ultimately, are you trying to disconnect the battery to save the battery life? Unless your circuit draw a crazy current draw, most ods/fuzzes/wahs draw in the region of 10ma or less. If you really want to reduce current draw/extend battery life, don't put a led indicator on. The above solution might work, but it is starting to look pretty complicated, with a fairly high parts count.

Being in Europe, could you not order from Banzai Effects? Their prices don't seem too high.