DIY attenuator

[Icetech]

Hey guys, i was getting parts to build a airbrake, and the big adjustable resistor that mouser has been out of i found elsewhere... said they came with 2 clips, which i assumed was the adjusting ring... but they meant mounting clips...

it only came with 1 adjusting ring, anyone know where to get more of those rings? or a part# fo that ring at mouser.....

I ordered 2 of these big resistors and will only need 1... (ordered 2 cause it said they came with 2 clips... figured i would have 4 clips... oops...) so if anyone needs that part msg me..

[sliberty]

Adjustable rings (out of stock at Alied and Mouser though):
http://www.alliedelec.com/Search/Produc ... D8050FE17F

Mounting clips:
http://www.alliedelec.com/Search/Produc ... 804CA7E17F

[sliberty]

These guys seem to have some in stock:

http://www.onlinecomponents.com/search- ... ef=Froogle

[Icetech]

Thanks slib, that online components one brought up like 8 parts though... which part # is correct? just 2125e?

[Icetech]

nevermind... its the 2125.. found it.. place takes $30 minimum orders:( bah!

[nek]

Is -3dB attenuation OK? Get it completely transparently by halving the amp impedance, plugging the attenuator into one speaker jack and speakers into the other (not into the attenuator).

[Jackie Treehorn]

If you're making an airbrake, I've got a "suggested mod"

[img:640:480]http://theinside.net/misc/IMG_0025.JPG[/img]

[img:640:480]http://theinside.net/misc/IMG_0026.JPG[/img]

You can add a relay to jump across the adjustable resistor so that you can get a footswitchable boost. I've got mine set to go from 4 or 3 to setting two, but you could just as easily add another little adjuster ring for the boost setting, too.

It works great to get a louder clean sound or as a solo boost.

[Icetech]

Got it all done, I must say that its bout the best $80 i have ever spent in amp gear...

I have a marshall master lead 100w that i have never been able to play past bout 2, at least not for more than a minute.. and the airbrake tamed it right down for me:) (i was only running on 2 output tubes)

One thing that surpises me though is the ammount of heat this thing makes... i expected heat.. but damn... also suprised that the ground side resistor gets quite a bit hotter than the positive side..

think im gonna drill holes in it for cooling