madriaanse

Neve 1290 build completed!!
« on: January 04, 2007, 01:16:07 PM »
I finally finished my 1290 (1073 mic pre only)! It sounds great - especially at less than $300/ch! A while ago I posted about a PCB I had made with two pre stages, the driver stage, and most of the other components from drawing EH10023 and EN10041. This worked well but it still needed an external rotary switch to make a complete preamp. Wiring the rotaries turned out to be time consuming and a hassle so I designed a new board that features a PCB mounted rotary. This makes wiring very simple. I can build one channel in an evening now.

I wanted to thank this forum and Geoff Tanner for the helpful information!!

Here are some pictures of the prototype:

http://www.musiciansgig.com/neve/

EDIT:
Also, more pictures of my 8 channel version, build documentation here:
http://www.groupdiy.com/index.php?topic=22828
« Last Edit: March 18, 2010, 12:28:29 PM by madriaanse »


3nity

Neve 1290 build completed!!
« Reply #1 on: January 04, 2007, 01:28:31 PM »
awesome! that looks very neat, no phase no pad?
where did you get the boards?
nice.
Life is a path, death the destination.

madriaanse

Neve 1290 build completed!!
« Reply #2 on: January 04, 2007, 01:38:51 PM »
Hi 3nity,

no phase, no pad, no trim, just 5db steps - all I need. I did this to keep cost down. ($400/ch includes case, PSU, transformers and rotary) I designed the PCB myself. Then I had a PCB manufacturing company make me 16.

All the best,

M.

Lowfreq

Neve 1290 build completed!!
« Reply #3 on: January 04, 2007, 03:03:20 PM »
Very Nice :thumb:

I'm assuming the PSU is in an external box?

tommypiper

Neve 1290 build completed!!
« Reply #4 on: January 04, 2007, 10:37:15 PM »
Good solution with the Grayhill.

I'm sure you could sell some of those boards here.  I'd be interested... :grin:
Imagine a wet, slightly chilled from its gas release and decompression, with water droplets condensing, sucking surface tension, slowly sliding down the side, capped by a healthy virgin froth on top..

synthi

Neve 1290 build completed!!
« Reply #5 on: January 04, 2007, 10:59:03 PM »
Yes, I`m sure you`ll find lot of people interested in getting your pcbs! (including me of course!)

Synthi

Purusha

Neve 1290 build completed!!
« Reply #6 on: January 05, 2007, 04:33:36 AM »
Hey guys, where do you buy those transformers?
Regards as always, Purusha

Neve 1290 build completed!!
« Reply #7 on: January 05, 2007, 08:22:31 AM »
Quote from: "Purusha"
Hey guys, where do you buy those transformers?

Looks like the Carnhill ones via the group buy

Anthropic

Neve 1290 build completed!!
« Reply #8 on: January 05, 2007, 09:44:53 AM »
Where'd you get those Grayhill switches?  Nobody seems to stock them...

Thanks!
Dan Maksym
Anthropic Audio

tommypiper

Neve 1290 build completed!!
« Reply #9 on: January 05, 2007, 10:11:59 AM »
Digikey will do a special Grayhill order for you.  I've checked around, and their prices are about the best.
Imagine a wet, slightly chilled from its gas release and decompression, with water droplets condensing, sucking surface tension, slowly sliding down the side, capped by a healthy virgin froth on top..


madriaanse

Neve 1290 build completed!!
« Reply #10 on: January 05, 2007, 11:41:44 AM »
Lowfreq: PSU (JLM ACDC with Amveco TE62085-ND) is in an external cast aluminum enclosures.

tommypiper, synthi: I'd be happy to sell those (2 layer, solder masked, silk screened) boards at $20 USD/ea + shipping.

Purusha: I purchased a batch direct from Carnhill, but it's far easier/cheaper to order from: http://www.audiomaintenance.com/acatalog/Transformers_and_Inductors.html

Anthropic: switches can be ordered from:http://www.audiomaintenance.com/acatalog/switches.html.

All the best,

Martin

synthi

Neve 1290 build completed!!
« Reply #11 on: January 05, 2007, 01:10:04 PM »
good!

I`d like to get at least two boards. For international shipping USPS airmail is fine, the boards can go in a letter post and is faster and cheaper than parcel post. use the USPS calculator @ www.usps.com

:thumb:
Synthi

laitue5

Neve 1290 build completed!!
« Reply #12 on: January 05, 2007, 02:51:34 PM »
Quote from: "madriaanse"
To start, here's a  "cleaned up" version of drawing EH10023:
http://www.musiciansgig.com/neve/1290.pdf


Notice that this is not the 1290 schematic.
It’s a 1073 schem. you edited.
It's probably very similar but it is not the same.
I can send the original 1290 schematic if someone need it.
metal film 1/4W is ok

madriaanse

Neve 1290 build completed!!
« Reply #13 on: January 06, 2007, 09:50:34 PM »
laitue; you are correct, but this is why I mentioned the EH10023 reference.  :wink: I've redrawn this 1073 schematic to be less confusing than the others; it was the inspiration for the Neve 1290 boards I designed.

All the best,

Martin

buschfsu

Neve 1290 build completed!!
« Reply #14 on: April 16, 2007, 09:19:36 AM »
i just ordered two of these boards  ez1290  and they look great.

 thick traces and clean silkscreen.   highly recommended.  ill let you know how they sound after the carnhill group buy!!!!!!!!!!


thanks Martin!!
PRR said...
OHM'S LAW. Not as an abstract thing: you should be able to glance at a small circuit and "instantly" know I and V, the way a soccer player glances at the ball and knows the angle and kick

sodderboy

Neve 1290 build completed!!
« Reply #15 on: April 16, 2007, 02:44:27 PM »
That looks like the Canare Sepia wire in there.  Great wire.
You should check some original schemos, because you will be wanting to tie those trannies to chassis, as well as the output XLR pin 1's.
Mike

madriaanse

Neve 1290 build completed!!
« Reply #16 on: April 19, 2007, 02:43:36 PM »
Buschfsu: glad you like the boards!! I have a feeling you'll like the sound as well!! :-)

Sodderboy: Good eye!! That's Canare L4E6AT in there! The only thing you gain by connecting pin 1 of the output is the risk of ground loops. It's not needed since pin 1 is already grounded by the device AFTER the preamp (compressor, A/D converter, etc).

The only change I'll make is incorporate a custom rotary switch that already has some of the pins removed. I'm working with Grayhill on this and will have a part# shortly. These custom switches are only a few dollars more; Grayhill is a great company to work with!!

All the best,

M.

Tillmann

Neve 1290 build completed!!
« Reply #17 on: April 22, 2007, 12:21:29 PM »
very interesting project.  keep us posted on that.


T

Nickos

Neve 1290 build completed!!
« Reply #18 on: April 26, 2007, 03:32:01 AM »
Madriaanse, I'll like to build 2 preamp like your.
Can you sell me 2 pcb?

PS your assembly guide rocks!  :cool:

Thank you,
Nickos

madriaanse

Neve 1290 build completed!!
« Reply #19 on: April 27, 2007, 06:57:28 PM »
Hi Nickos,

Wowsers, this Carnhill group buy has me completely sold out of PCB's.  :green: I'm going to get some more made and will contact you when they arrive.  :thumb: In the meantime, could you PM me your email address?

Take care,

M.


 

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