Alairex - H.A.L.O. Overdrive  [traced]

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Alairex - H.A.L.O. Overdrive

Postby Saruman_ » 01 Dec 2012, 17:05

Image
Image
Image

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Re: Alairex H.A.L.O. Overdrive

Postby LaceSensor » 01 Dec 2012, 17:26

Nice pictures
Thought this sounded pretty nice actually, justifying the amount of shit in there!
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Re: Alairex H.A.L.O. Overdrive

Postby okgb » 01 Dec 2012, 17:34

Allot of diodes , I'd like to see the top outside , curious what controls & switches there are
and Ohhh secret I.C.'s ................
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Re: Alairex H.A.L.O. Overdrive

Postby deafbutpicky » 01 Dec 2012, 18:27

From looking at the solder side, I'd say the 16pin IC in the middle is a CD4049UB. pins 13 and 16 are free...
Another guess: It's for the saturation mode.
I'm using capacitors to replace my guitar effects and give more clarity to the sound.
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Re: Alairex H.A.L.O. Overdrive

Postby Saruman_ » 01 Dec 2012, 21:28

From looking at the solder side, I'd say the 16pin IC in the middle is a CD4049UB. pins 13 and 16 are free...
Another guess: It's for the saturation mode.

no, it's part of the switching. no CD4049UB
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Re: Alairex H.A.L.O. Overdrive

Postby atreidesheir » 02 Dec 2012, 03:10

Big ups Saruman!
Every time you post it is juicy.
Incredible amount going on for an od.
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Re: Alairex H.A.L.O. Overdrive

Postby Saruman_ » 02 Dec 2012, 07:48

Image
other diodes are used for control switches J113

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Re: Alairex H.A.L.O. Overdrive

Postby atreidesheir » 02 Dec 2012, 16:48

15 transistors
5 integrated circuits (counting the double)
and 6 diode sets (not counting the singles - i am guessing some assymmetrical pairs also)
that is really intricate for what it does.

If it was lovepedal, I would say maybe 5 electra distortions in series with 2 or 3 landgraff tubescreamers with "clipping options"
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Re: Alairex H.A.L.O. Overdrive

Postby Lucifer » 02 Dec 2012, 17:42

And here it is - the LP Cooling system for nuclear fission plants.
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Re: Alairex H.A.L.O. Overdrive

Postby morbidalex666 » 02 Dec 2012, 21:46

Original or not, this one sounds killer in the demos.
Complexity -wise, it does rival mr Tripp's designs IMO.
Pretty expensive too!
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"Let the Metal flow"
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Re: Alairex H.A.L.O. Overdrive

Postby Ice-9 » 03 Dec 2012, 13:19

He's went to a lot of trouble even grinding of the value of the box caps .
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
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Re: Alairex H.A.L.O. Overdrive

Postby Saruman_ » 05 Dec 2012, 07:34

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Re: Alairex H.A.L.O. Overdrive

Postby Saruman_ » 11 Dec 2012, 06:37

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Re: Alairex H.A.L.O. Overdrive

Postby bajaman » 11 Dec 2012, 09:10

whoa :shock:
Is that a three layer board - looks like yet another tubescreamer rat combo with a speaker simulator and baxandall three band eq :roll:
would be interesting to see the filter values and interesting input buffer stage :lol:
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Re: Alairex H.A.L.O. Overdrive  [traced]

Postby Saruman_ » 14 Dec 2012, 05:38

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Re: Alairex H.A.L.O. Overdrive

Postby bajaman » 14 Dec 2012, 11:09

Thanks to Saruman for the values :thumbsup - here is the really interesting bit :wink: - the post clipping filter response after the clipping stage and up to the master volume controls.
Halo post clipping filter response curves.gif
The graph shows the response as the signal passes through each successive filter / gain stage.
The red curve shows the input (normalized for a flat response)
The next curve (green) shows the response after the broad mid notch and gain recovery stage.
The blue curve shows the response after the first op amp low pass filter stage.
The purple curve shows the response after the second op amp low pass filter stage.
The yellow curve shows the response after the third emitter follower low pass filter stage.
AND the pink curve shows the response after the final broad notch filter and output buffer op amp stage.
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Re: Alairex H.A.L.O. Overdrive

Postby Saruman_ » 14 Dec 2012, 18:41

True sound of HALO very close. But the feeling when you play nice.
I tried my version. It sounds almost exactly like the original Halo.
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Re: Alairex - H.A.L.O. Overdrive

Postby roseblood11 » 04 Sep 2018, 10:49

Did anybody ever try to make a pcb for the original circuit or for Sarumans stripped down version?
Sarumans version should be even small enough for veroboard in a 1590bb
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