Neve Line-In Boards feeler

[madriaanse]

Hi Everyone,

Some forum members have expressed interest in the 1073 line input boards I made a while ago. These boards are great for a summing front end, implementing faders for a mini-mixer, warming up a stereo mix, adding an entire new Neve flavored front/back end to existing line level gear, etc. Please see:
http://groupdiy.com/index.php?topic=34292.0

To get some reasonable prices on manufacturing I need to order at least 10 boards. Please let me know if you're interested and I'll put a group buy together.

Best,

M.

 

[Whoops]

Hello Martin,
count me for 2 for sure.

I will increase to 4 depending on the final price.

Thank you so much Martin.

 

[Gilbert]

I'd be interested in 8-16 depending on the final price.
Thanks!

 

[XAXAU]

I can take 2-4 pcs.

 

[CJ]

running an input xfmr?

mght have a pc mount version available,

 

[fizmo]

I'll take four.

Thanks

 

[XAXAU]

running an input xfmr?

mght have a pc mount version available,

Carnhill VTB9046 I think.

 

[Rocinante]

2-4 here please Martin

 

[Potato Cakes]

I'm interested in at least 8, but the summing mixer build I am looking do does not need a fader, only the option to mono sum pairs. I would just need to know if there are some already calculated values for resistors to get unity through the circuit. Maybe on the backside I could wire the output transformer to be 1:2 if I wanted more gain. Would anybody here like to share what they did for summing mixers built with this PCB?

Thanks!

Paul

 

[MountCyanide]

At least 2 here.

 

[API]

So if i understand it correctly, this is a B283 card with a gain trim?

 

[madriaanse]

So if i understand it correctly, this is a B283 card with a gain trim?

Yes, It's the entire line input/output of a 1073. It has the 7 line input gain settings from the original schematic and the option to accommodate a (trim) fader. I ended up using a 10K, 104mm Penny and Giles fader for this purpose. The idea is to use it as a colorful, transformer coupled front end to a passive summing mixer, or use it as an upgraded balanced line driver/receiver for gear with mediocre inputs/outputs. (Revox A77 anyone?)

I've created an updated BOM for this project: https://s3.amazonaws.com/EZ1290/LN72BOM13.xls

CJ, my man, are you gonna wind us some 31267's!?  Let me know and I'll put your info into the BOM. Wire leads would be preferred.

Since many people have expressed interest, I'm going to do a run of 50 for now. Boards will be $16.00 each + shipping. To reserve PCBs, please send me an email at: 1290preamp at gmail dot com

Original schematic here: http://www.technicalaudio.com/neve/neve_pdf/1073-fullpak.pdf

This board lets you build: T2 -> EK20033 -> BA183AV ->T3

For assembly instructions, this guide should get you 99% there: https://s3.amazonaws.com/EZ1290/assembly6.pdf The only difference is that the assembly guide is for the mic pre version of this project: http://www.groupdiy.com/index.php?topic=22828.0

Best,

M.

 

[CJ]

Marcelo at Chameleon Labs says he could sell the line in xfmr for $45 a pop,

told him we want another option besides PC mount and he mocked something up with solder pins,

this is just a proto type idea>

 

[CJ]

here is the pc mount version which features a mu can,

let me know if you want the footprint for an either/or option on the board,

you could have bigger holes for wire attached to the pc mount traces,

 

[madriaanse]

Nice work CJ, as always. That's about $20 cheaper than the Carnhill equivalent. Would it be possible to stick it in a pretty green St. Ives themed can? 

M.

 

[CJ]

you could buy the Carnhill if you want the classic package,

where do you get Carnhill stuff in the US?

came up with 78 bucks from AML which is in the UK,

Carnhill is using 80 Ni for their line inputs, which is a mistake IMHO,

these line in's are 50 Ni so saturation is not a problem for hot inputs,

BTW, not making any $$ off this, just providing another choice for DIY'ers,

 

[madriaanse]

you could buy the Carnhill if you want the classic package,

where do you get Carnhill stuff in the US?

came up with 78 bucks from AML which is in the UK,

Carnhill is using 80 Ni for their line inputs, which is a mistake IMHO,

these line in's are 50 Ni so saturation is not a problem for hot inputs,

BTW, not making any $$ off this, just providing another choice for DIY'ers,

Nice! How did you arrive at using 50% Ni for the line-ins?

M.

 

[kosi]

also interested in 2

 

[drask]

would it be possible to add an insert point?
Thanks

 

[madriaanse]

would it be possible to add an insert point?
Thanks

It's already onboard. (Between P and L) 

M.