Airbrake Files

Trainwreck schematics, designs, pictures. Only members may post files here.

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bart
Posts: 2
Joined: Wed Jun 02, 2010 4:46 pm

Re: Airbrake Files

Post by bart »

M Fowler wrote:Bart I like your use of instrument case works very well with slant front panel.
:)
Mark
Thank you! And it's a little vented so i didn't have to drill.
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rawnster
Posts: 562
Joined: Wed Feb 20, 2008 4:27 pm
Location: Northwest

Re: Airbrake Files

Post by rawnster »

Yeah, Bart, that's pretty sweet looking :!:
iamjared
Posts: 1
Joined: Mon Jan 10, 2011 1:58 am

Db level

Post by iamjared »

Hey all,

I'm moderately knowledgeable about electronics, I feel like I could accomplish this. Just wondering how many db this could attenuate sound? For example the Dr. Z airbrake can only do -11db while the Weber MiniMass can do -50db reduction.

I suppose the better question would be, where does that limitation come from? What would have to be modified to increase the amount the device can attenuate?

Thanks so much.
archelo
Posts: 2
Joined: Tue Jul 08, 2008 11:49 am

attenuator footswitch?

Post by archelo »

Does anybody have a layout to add a bypass footswitch to the Airbrake III? I have searched through a few threads but nothing.
rmroza
Posts: 51
Joined: Mon Aug 16, 2010 5:58 pm

Re: Airbrake Files

Post by rmroza »

Just to clairfy....no, the information you (iamjared) supplied is incorrect!! - http://www.drzamps.com/Documents/Manuals/Airbrake.pdf

Actually, with these values, the Z Brake attenuates the following...
-1.8dB per step 1-4 (0 is bypass) or up to -7.2dB (4 x -1.8 dB)
In the 5th of "bedroom" position, it will adjust between -7.2dB and -30dB!!! NOT -11dB (as suggested)!

...now we all know!

Robb
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selloutrr
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Joined: Sun Oct 14, 2007 2:44 am
Location: Southern California

Re: Airbrake Files

Post by selloutrr »

The original Airbrake built by KF
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My Daughter Build Stone Henge
tsutt
Posts: 264
Joined: Fri Jan 06, 2012 1:12 pm

Re: Airbrake Files

Post by tsutt »

So which layout is correct out of these. The one labeled 195_198 0r the one labeled c502?

Todd
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M Fowler
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Location: Walcott ND

Re: Airbrake Files

Post by M Fowler »

Really depends on the parts you buy as the numbering system are different for each sector of the switch.

After you get your parts you then compare and match to correct layout.

Heck there must be 10 layouts floating around by now.
tsutt
Posts: 264
Joined: Fri Jan 06, 2012 1:12 pm

Re: Airbrake Files

Post by tsutt »

Ok but there a couple comments of some being incorrect. Just want to keep the smoke inside.
bluemeany
Posts: 5
Joined: Thu Feb 28, 2013 6:36 pm

Re: Airbrake Files

Post by bluemeany »

In the airbrake iii is there any particular reason why a 8 ohm 20watt resistor was used to provide the shunt value of 21 ohms (8 + 13 ohms in series) rather than just another adjustable lug on the main shunt resistor? I can't see the point of the 8ohm rather than just getting an extra adjustable lug...

Also if you look at the maths for the airbrake iii when using a 4 ohm speaker you get these impedances;

1) 4ohms (bypass)
2) 3.44 ohms
3) 5.793 ohms
4) 6.5 ohms
5) 8.3 ohms
6) 8.976 ohms

So as you can see, for the first three clicks of the switch you're best using the 4 ohm tap from your amp, for the last three clicks it's best to use the 8 ohm tap.

With a 16 ohm cab the values range from 8.55 ohms to 10.244 ohms, so you're best going with the 8 ohms tap on your amp all the way down (apart from bypass of course).
kinski
Posts: 4
Joined: Thu Jul 18, 2013 2:22 pm

Re: Airbrake Files

Post by kinski »

Thanks for all of the great info here. I plan on building this thing. However, I'd like a smaller version similar to the Brake Lite. Can I build this exact layout but use two 50w 250 ohm resistors?

Perhaps just two of these in place of the 100w resistors:

http://www.alliedelec.com/search/produc ... U=70022799
neversour
Posts: 5
Joined: Tue Dec 10, 2013 7:06 pm
Location: NY

Real vs clone

Post by neversour »

On a real Airbrake you don't have to worry about impedance. At least that's how they advertise it. The unit matches it for you. Is that the case with this build or do you have to adjust the impedance on the amp?
-Dom
Ampeg VT-40 4x10 combo w/Jensen MOD 10-70
Rolland JC-120 2x12 Combo
neversour
Posts: 5
Joined: Tue Dec 10, 2013 7:06 pm
Location: NY

Re: Airbrake Files

Post by neversour »

Also, the schematic says "50 watts in". Does that mean this only handles 50 watts max? The airbrake is suppose to handle up to 100 watts. [/url]
titser_marco
Posts: 131
Joined: Tue Mar 13, 2007 3:08 pm

Re: Airbrake Files

Post by titser_marco »

Will this work for a100 w amp that has 4 ohm out?
ACDCG400
Posts: 21
Joined: Sat Aug 30, 2008 8:52 pm
Location: CT

Re: Airbrake Files

Post by ACDCG400 »

nvm found what i was looking for!
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