tony dB

Anyone built a 'What Compressor'?
« Reply #20 on: April 05, 2005, 07:01:19 PM »
start in Belgium?
Could be your European distributioncenter  :guinness:


Greg

Anyone built a 'What Compressor'?
« Reply #21 on: April 05, 2005, 07:02:49 PM »
hey Fabio:

You could move to New Orleans... The bars never close here. But I will admit New Orleans is a black hole, and you never be able to leave.
Greg Stein
New Orleans, LA

Bauman

Anyone built a 'What Compressor'?
« Reply #22 on: April 06, 2005, 12:21:29 AM »
bars that never close? uuh, this is dangerous  :twisted:
cheers!
Fabio
_____________________
www.thediypill.com/store

Mendelt

Anyone built a 'What Compressor'?
« Reply #23 on: April 06, 2005, 05:25:14 AM »
By the way. Is anyone familliar with this design?

http://www.geocities.com/m_natsume/what_compressor.html

It seems to be a variation on the what compressor but with 5532's in the audio path, an attack, release and ratio control and without the double release.

clintrubber

Anyone built a 'What Compressor'?
« Reply #24 on: April 06, 2005, 05:27:53 AM »
Quote
bars that never close? uuh, this is dangerous


Dangerous, tell us about it... I mean, what about this place ?  :wink:

matta

Anyone built a 'What Compressor'?
« Reply #25 on: April 06, 2005, 12:57:39 PM »
Quote
By the way. Is anyone familiar with this design?

http://www.geocities.com/m_natsume/what_compressor.html

It seems to be a variation on the what compressor but with 5532's in the audio path, an attack, release and ratio control and without the double release.


I'm sure Mnats could enlighten us, from the sounds of it he once printed the boards for what as well.

I am sure Peter had a reason for using the Op-amps he did, maybe he will pipe in. I like Peters design because it is a not frills opto, and to be honest I kind of like the 'less is more approach'

Cheers

Matt
Matt Allison
www.matt-allison.com

Quote
We are not going to start thinking of ways to get an octopus to commit a crime, cause that just has failure written all over it – Earl J Hickey

Ptownkid

Anyone built a 'What Compressor'?
« Reply #26 on: April 06, 2005, 01:21:45 PM »
I wanted to get some of Fabio's boards for this, anybody have any interest?

peterc

Anyone built a 'What Compressor'?
« Reply #27 on: April 06, 2005, 01:23:26 PM »
I used the components specified in the original design apart from the opto.

The MC33079 would sound good in there, I'm sure. EDITED (thanks Jakob)

Peter
If opportunity doesn't knock, build a door.

gyraf

Anyone built a 'What Compressor'?
« Reply #28 on: April 06, 2005, 01:26:47 PM »
Make that MC33079..  :grin:
..note to self: don't let Harman run your company..

Flatpicker

Anyone built a 'What Compressor'?
« Reply #29 on: April 06, 2005, 03:46:00 PM »
Quote from: "Mendelt"
By the way. Is anyone familliar with this design?
No, I have not seen this. Thanks for putting it up. Odd that no one thought of patenting the high pass filter before the sidechain thing before ATI.


Mendelt

Anyone built a 'What Compressor'?
« Reply #30 on: April 06, 2005, 03:58:21 PM »
Quote from: "matta"

I'm sure Mnats could enlighten us, from the sounds of it he once printed the boards for what as well.

I am sure Peter had a reason for using the Op-amps he did, maybe he will pipe in. I like Peters design because it is a not frills opto, and to be honest I kind of like the 'less is more approach'

Cheers
Matt


I hadn't even noticed it was mnats's site.. I just had that link floating around in the linkbar on my browser.
I find both what-designs interesting. Seems to me the original what-compressor is designed especially for vocals with the "april resistor" for mixing in some dry signal and its fixed low ratio. While the mnats version is more flexible cause it has all the knobs you'd expect in a compressor.

Michael Krusch

Anyone built a 'What Compressor'?
« Reply #31 on: April 07, 2005, 06:26:24 AM »
I have also built the what compressor. At the moment it's my favourite vocal compressor.
I have changed some thing:
-symmetrical ins and outs
-additional output pot
-lower values of the feedback caps in the audiopaths, because it killed some highs
-different opamps in audiopath
-gain reduction metering
-no 'April' resistor

I like the two caps in the sidechain, wouldn't leave them out like nmat did. It fits nice on vocals.
I have tried this compressos on drums and it gives very unique sound, not camparable to other compressors.

StephenGiles

Anyone built a 'What Compressor'?
« Reply #32 on: April 08, 2005, 01:10:35 PM »
Just arrived back home from Argentina, via San Paulo on the worst transatlantic flight ever, on a British Airways 747-400 with new seat configuration. This means economy seats which are not only narrow, but very close to the row in front. Many passengers were very angry, especially as the air conditioning turned into heating! - no sleep and the breakfast was disgracefull. We will never fly British Airways to South America again, we'll probably try Varig next time.

Ah yes the What compressor, I have built 5 of these, all on Veroboard all with the April resistor, and I changed one resistor to increase the amount of compression  on the last 2 I built - I'll look this up and post which one when I've had some sleep.
Stephen
The best place to find a helping hand is at the end of your arm!

StephenGiles

Anyone built a 'What Compressor'?
« Reply #33 on: April 09, 2005, 08:43:09 AM »
matta - would you please let me know about the side in and out - is this short for sidechain perhaps, or have I missed the point in your excellent explanation? I've also noticed that you have quoted BC327 for Q1, is this what you just happened to have or do you have a preference for this transistor?
Stephen
The best place to find a helping hand is at the end of your arm!

matta

Anyone built a 'What Compressor'?
« Reply #34 on: April 09, 2005, 04:43:08 PM »
Hi Stephen,

It wasn't me that posted that info.

I have yet to build a 'What', I am hoping to. I was looking for a simple, yet effective vocal comp and it seems the 'What' is very favorable for this. I was hoping to see what others thought of it, and the response so far has been great and I will be building 2. I am planning on getting 2 boards from Fabio, anyone else want? Post here and hopefully he can Fab a bunch. I am sure he wouldn't mind and confirm price.

His board looks great because as with all his other boards it gives you options, I however am not sure there is a sidechain option like in Mnats design, though I might be wrong.

Cheers

Matt
Matt Allison
www.matt-allison.com

Quote
We are not going to start thinking of ways to get an octopus to commit a crime, cause that just has failure written all over it – Earl J Hickey

StephenGiles

Anyone built a 'What Compressor'?
« Reply #35 on: April 09, 2005, 05:44:07 PM »
matta - now I've caught up with lost sleep, I can see what you say! Where he says "Side" perhaps the more usual jargon is "Key". At least that is what I've seen in a number of circuits. Incidentally, changing R9 to 47k in the original circuit gives far more compression.
Stephen
The best place to find a helping hand is at the end of your arm!

omeiko

Anyone built a 'What Compressor'?
« Reply #36 on: April 10, 2005, 09:01:46 AM »
Quote
Intersting. Could you share more about the mods?


Well, it's nothing special. I just removed the tantalums from the release circuit. This way the attack and release is determined by the opto-element's behaviour (very fast in the case of the VTL5C9). Works well on vocals though the sound is not as "open" as with the original circuit. It sounds a little more "controlled".
It would be interesting to try how a slower acting vactrol (e.q vtl5-c2) would work here.

Okko

evil grill

Anyone built a 'What Compressor'?
« Reply #37 on: April 11, 2005, 12:02:37 AM »
i´ve been thinking about building the "what" for years but as with most cool diy electronics i never get the time.
here´s a mod that i think would be better for stereo use.  
http://www.geocities.com/evilgrill/what_stereomod.gif
if the left channel is to be totally in control make sure to switch the right channel signal out of the right channel sidechain (at the same point). does this make sense to you? i´m really tired after cleaning up the studio instead of sleeping and i should go to bed but... i donno, eh. this thread is really interesting. makes me wanna build stuff.

matta

Anyone built a 'What Compressor'?
« Reply #38 on: April 11, 2005, 01:13:47 PM »
Hey Guys,

Fabio has offered to do a run of his 'What' boards,  we need a group buy, details are  here: http://www.groupdiy.com/index.php?topic=6812

Cheers

Matt
Matt Allison
www.matt-allison.com

Quote
We are not going to start thinking of ways to get an octopus to commit a crime, cause that just has failure written all over it – Earl J Hickey

StephenGiles

Anyone built a 'What Compressor'?
« Reply #39 on: April 13, 2005, 05:21:41 PM »
I've altered up my What Compressor redraw as the Weak Joe, which I'll post tomorrow. There are more values changed than I originally thought.
Stephen
The best place to find a helping hand is at the end of your arm!


 

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