This is the attenuator I built with the help of Williameon, who sold me the parts and sent me the layout. It sounds great, and I'm waiting for Otto to help me with the diagrams for the foot-switch to bypass it when I'm playing a guitar solo.
Hope you like it. [IMG805]http://img27.imageshack.us/img27/3448/p1010011g.jpg[/img]
Nice looking unit but how does that variable resistor work with one center lug and the non adjustable resistor has three lugs doing nothing or are there two variable resistors and one is upside down and why would anyone put the thing upside down?
First of all, I really don't know about electronics, so I just follow the diagrams to built.
Probably, what you are missing is one of the resistors located underneath. This picture will show you: [IMG900]http://img4.imageshack.us/img4/9051/p1010014n.jpg[/img]
I have five different degrees of attenuation (obviously), the number 6 being the bypass (no attenuation). There are no lugs doing nothing (every lug has a connection somewhere), and why does it matter if one resistor is upside down? even the original Airbrakes have it.
Can you be more specific about the problem you see?
I wired my airbrake pretty much the same way as is shown in asintoras' drawing. The only exception is that I don't have a footswitch option. Sounds great though, and attenuates as expected. This wiring scheme is the same one that was passed around in the non-rheostat airbrake thread.
I now understand and figured it out that he had his resistor upside down and it was not obvious as to what was going on at first. Most others have their resistor facing up so they can see the wire on the resistor.