The DijonStock Digital Home Recording Support Forum

*** USER REGISTRATION DISABLED! FOR ACCESS TO THE BOARD, MAIL TO registration AT dijonstock DOT com. THANK YOU ***
It is currently Sat Sep 23, 2017 6:32 pm

All times are UTC + 1 hour [ DST ]




Post new topic Reply to topic  [ 13 posts ] 
Author Message
PostPosted: Tue Nov 17, 2009 10:59 pm 
Offline
Dude

Joined: Fri Nov 13, 2009 10:51 pm
Posts: 18
Location: Sweden
Machine type: AW2400
Analog inputs 1 - 5.
Channel one is to the right.

Image

Image


Top
 Profile  
 
PostPosted: Wed Nov 18, 2009 12:45 am 
Offline
Robbie The Botkiller
User avatar

Joined: Sat Jun 19, 2004 12:46 pm
Posts: 5004
Location: Netherlands
Favourite food: Ria's cheesecake
Machine type: AW16G
Welcome to the forum.

That is cool! Got any more pics?

Newbie of the month nomination, all in favour say aye. Aye.

_________________

Don't judge the coffee by its cup.
The proof of the cheese is in the eating


Top
 Profile  
 
PostPosted: Wed Nov 18, 2009 7:46 am 
Offline
Mr. Electonica Dude
User avatar

Joined: Wed Jul 14, 2004 1:48 am
Posts: 11452
Location: Godly Taxas
Favourite food: Frog Legs
Machine type: AW4416
yup

Just felt like takin pics er what ?

msg

_________________
THE MUSIC IS DOWN IN HERE
____________________________________________________

Good judgment comes from experience, and a lot of that comes from bad judgment.


Top
 Profile  
 
PostPosted: Wed Nov 18, 2009 8:38 pm 
Offline
Tinhorn

Joined: Mon Mar 17, 2008 12:50 am
Posts: 317
Favourite food: overmuramovingcake
This pic explains where "quality" of mic preamps comes from... :shock: So many electrolytic capacitors in wrong place.
Can anyone recognise type of chips used here?
I vote for more pics, too.


Top
 Profile  
 
PostPosted: Wed Nov 18, 2009 9:59 pm 
Offline
Dude

Joined: Fri Nov 13, 2009 10:51 pm
Posts: 18
Location: Sweden
Machine type: AW2400
Same section but after having replaced the "el cheapo" parts with audio rated parts.

Image

Image


Top
 Profile  
 
PostPosted: Wed Nov 18, 2009 10:19 pm 
Offline
Robbie The Botkiller
User avatar

Joined: Sat Jun 19, 2004 12:46 pm
Posts: 5004
Location: Netherlands
Favourite food: Ria's cheesecake
Machine type: AW16G
The difference that I see is that you replaced a couple of capacitors. If there's more, I didn't see it.

Why did you do it - lowering the hiss from the internal preamps? Did it work out?

_________________

Don't judge the coffee by its cup.
The proof of the cheese is in the eating


Top
 Profile  
 
PostPosted: Thu Nov 19, 2009 7:46 am 
Offline
Mr. Electonica Dude
User avatar

Joined: Wed Jul 14, 2004 1:48 am
Posts: 11452
Location: Godly Taxas
Favourite food: Frog Legs
Machine type: AW4416
looked like handfuls to me :shock:

_________________
THE MUSIC IS DOWN IN HERE
____________________________________________________

Good judgment comes from experience, and a lot of that comes from bad judgment.


Top
 Profile  
 
PostPosted: Thu Nov 19, 2009 8:31 pm 
Offline
Dude

Joined: Fri Nov 13, 2009 10:51 pm
Posts: 18
Location: Sweden
Machine type: AW2400
Close up photo of input op-amp after modification.

Image

Image


Top
 Profile  
 
PostPosted: Fri Nov 20, 2009 7:59 am 
Offline
Mr. Electonica Dude
User avatar

Joined: Wed Jul 14, 2004 1:48 am
Posts: 11452
Location: Godly Taxas
Favourite food: Frog Legs
Machine type: AW4416
Nice soldering bro.

_________________
THE MUSIC IS DOWN IN HERE
____________________________________________________

Good judgment comes from experience, and a lot of that comes from bad judgment.


Top
 Profile  
 
PostPosted: Fri Nov 20, 2009 1:40 pm 
Offline
HamelnStock Survivor and Midi Guru
User avatar

Joined: Wed Nov 26, 2008 12:20 am
Posts: 2640
Location: Belgium
Favourite food: the edible kind
Machine type: AW16G
You either have a very steady hand and lots of experience or you are the Indiana Jones of recorders ! I too would like to know more about why you did it and what the difference after the mod is ?

It looks like great work anyway !

_________________
In a minute it might be gone. Life is a bear in a bubble.

http://www.soundclick.com/bearinabubble


Top
 Profile  
 
PostPosted: Sat Nov 21, 2009 7:24 pm 
Offline
Dude

Joined: Fri Nov 13, 2009 10:51 pm
Posts: 18
Location: Sweden
Machine type: AW2400
The purpose of this project was to try lowering the noise on the inputs.
It was actually made possible thanks to those hot air smd rework stations
that has become available for a reasonable cost.
With OPA1612 operation amplifier in this position there are no noise until gain is at maximum Image
In the other positions I use OPA2134 except for position IC901 where I also use OPA1612.
The capacitors I use are ELNA type RFS, Nichicon type KZ and Nichicon type KW.
And yes I did a lot of practicing on a scrap board before started on the AW. Image


Top
 Profile  
 
PostPosted: Sat Nov 21, 2009 7:32 pm 
Offline
HamelnStock Survivor and Midi Guru
User avatar

Joined: Wed Nov 26, 2008 12:20 am
Posts: 2640
Location: Belgium
Favourite food: the edible kind
Machine type: AW16G
I had the pleasure to work with scandinavians (Norwegians in this case) and so far they have amazed me with their professionalism. I guess you are on the same level. I am wondering if the AW16G can be improved in similar ways although i doubt that i will find the courage to take it appart. Bravo !

_________________
In a minute it might be gone. Life is a bear in a bubble.

http://www.soundclick.com/bearinabubble


Top
 Profile  
 
PostPosted: Sat Nov 21, 2009 10:13 pm 
Offline
Robbie The Botkiller
User avatar

Joined: Sat Jun 19, 2004 12:46 pm
Posts: 5004
Location: Netherlands
Favourite food: Ria's cheesecake
Machine type: AW16G
Can I come over with my G? I'll bring the cheese.

_________________

Don't judge the coffee by its cup.
The proof of the cheese is in the eating


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ] 

All times are UTC + 1 hour [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group