"Equal Opportunity" MM Pre

[billshurv]

That's a little strong for a first post. Care to Clarify?

 

[Joel Wesseling]

@? No matter how I look at it, it's free..

I hope to obtain X2 stereo sets of PCB's for this design..

 

[billshurv]

surely x4 as 2 would only do you a mono channel?

 

[Joel Wesseling]

Edited.. Thanks!

 

[Brinkman]

Or this one. I never have that problem so not sure how to fix it -)

Jan

According to OSH Park, this is the file naming convention used for their gerber uploading service.

boardname.GTL Top Layer
boardname.GBL Bottom Layer
boardname.GTS Top Soldermask
boardname.GBS Bottom Soldermask
boardname.GTO Top Silkscreen
boardname.GBO Bottom Silkscreen
boardname.GKO Board Outline
boardname.XLN Drills

But it is no matter, when the time comes I will just discuss it with customer assistance.

Thanks a ton SY and Jan!

 

[jgf]

I recently read the linear audio articles for this preamp, and am considering building one in the semi-near future. (I suppose I should finish the phono pre I'm working on now, first!) If there's a board order happening, I'd like to go in on it...!

 

[jackinnj]

I can do a board, as I did for the Impasse, His Majesty's Noise and Dick Marsh's HA -- sell them at cost which should approximate $3 -- but can't get them turned around until early October. Why cost? It's Stu's IP.

FWIW, there will be a new HMN board sometime in the fall.

 

[billshurv]

If you do I will take 8. No rush so end of year works for me.

 

[jgf]

I also would be in for 4 or 8. No rush either. Speaking of HMN preamp, I'm borrowing the balanced heater regulator from that design for my current phono preamp build, so if there are boards anywhere for that, I'd like to get one. This build is an exercise in getting a 2-12ax7 preamp as quiet as possible. This will provide a baseline for comparison to a balanced phono.

 

[Joel Wesseling]

I'd be pleased and thankful to obtain 12

Thanks!

I'm in no hurry..

 

[jackinnj]

SY -- R53, 54, 55 appear on the BOM and PCB illustration, but not on the schematic...

 

[SY]

They're on the PCB schematics. I'll email those to you.

 

[billshurv]

They are on the PSU side http://linearaudio.net/sites/linearaudio.net/files/SY-TEO-v2.1 power supply.pdf

 

[JP]

They're on the PCB schematics. I'll email those to you.

Me too please.

 

[jan.didden]

According to OSH Park, this is the file naming convention used for their gerber uploading service.


But it is no matter, when the time comes I will just discuss it with customer assistance.

Thanks a ton SY and Jan!

My CAD (Labcenter's Proteus) generates no separate board outline layer, but there is an outline on the top silk screen layer. I went back to my fab house, Eurocircuits and you're right, they post a warning in the board analysis results but nevertheless turn out perfect boards...

Jan

 

[SY]

Me too please.

Use the link Bill posted (I've been waiting for that pun). It's more up to date than the pdf I have at hand.

Jan, when you did up the dummy values, you didn't change some of them on the schematics. The grid and gate stoppers should be 100R, not 10k.

 

[jackinnj]

Here's a suggestion input stage, filter and buffered output on one card measuring 3.5 x 8.0

 

[billshurv]

Ah didn't know you were considering a respin. Is there anything wrong with the existing layout?

 

[jackinnj]

The board Jan designed contains the regulators...thus you have 4 sets of regulators. I have a different idea.

Will also use Mouser's BOM tool for the RN55, RN60 resistors, MOSFETs, WIMA caps etc -- this will, thankfully, get me out of the parts business. Just download the CSV file and send it into Mouser. You'll have to get your JFETs from the DIYAUDIO store.

I can't find the work I did on the noise of 2N5460 vs J74, drat.

 

[billshurv]

ah ok. Makes sense, although I want to have a few of the standard board as they could be useful for non-RIAA duties...