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

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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Saruman_
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Post by Saruman_ »

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LaceSensor
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Post by LaceSensor »

Nice pictures
Thought this sounded pretty nice actually, justifying the amount of shit in there!

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okgb
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Post by okgb »

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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deafbutpicky
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Post by deafbutpicky »

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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Saruman_
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Post by Saruman_ »

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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Post by atreidesheir »

Big ups Saruman!
Every time you post it is juicy.
Incredible amount going on for an od.
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Saruman_
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Post by Saruman_ »

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other diodes are used for control switches J113

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Post by atreidesheir »

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"
"Contemplate it - on the tree of woe." :Thulsa Doom

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Post by Lucifer »

And here it is - the LP Cooling system for nuclear fission plants.
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Post by morbidalex666 »

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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Post by Ice-9 »

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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Saruman_
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Post by Saruman_ »

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bajaman
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Post by bajaman »

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:
bajaman

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Saruman_
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Post by Saruman_ »

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Alairex H.A.L.O. Overdrive schematic
Alairex H.A.L.O. Overdrive schematic

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Post by bajaman »

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.
cheers
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Saruman_
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Post by Saruman_ »

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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roseblood11
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Post by roseblood11 »

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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