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-   -   Doug Self Preamp from Linear Audio #5 (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a.html)

HaroldHill 15th May 2016 04:30 PM

Quote:

Originally Posted by georgebrooke (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4714282.html#post4714282)
Hi,
I am really looking forward to getting my panels cut professionally. I will send feedback as soon as I can this all set up. Thanks for the contribution

Thanks, George. I'd appreciate any input you can offer.

I'm relatively confident in the front panel. It was an easy lift; I just scaled Carl's original bitmap version and traced over it in a vector drawing program.

The back panel (for the Enhanced I/O board) involved a lot of back and forth, tweaking to get the drawing to match the reality of the board.

I'm planning on using 3mm thick aluminum plate. Hopefully, that'll do the trick.

still4given 15th May 2016 06:50 PM

Did you find your rear panel layout much different from the one I posted in post #444? I haven't checked them to see if there is a difference.

anystereo 17th May 2016 11:12 PM

How are you guys sourcing the ribbon cable?

drpro 18th May 2016 02:06 AM

eBay and Amazon is where I made my purchases for ribbon cables

HaroldHill 20th May 2016 10:30 PM

Quote:

Originally Posted by still4given (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4714634.html#post4714634)
Did you find your rear panel layout much different from the one I posted in post #444?

Still, I'll check this this weekend. Sorry for the slow response. I didn't realize you'd posted templates already!

still4given 21st May 2016 12:14 AM

Yours is nicer. It has silk. I just wondered if they have been compared.

georgebrooke 6th June 2016 12:46 PM

Front Panel Printing
 
Anyone wanting to make a DIY front panel might be interested in a product called Lazertran. It allows you to print onto a transparent layer (reversed mode) and then to bake the toner images onto a metal surface.

See Waterslide Decal Paper, Image, Transfer Paper, Iron On, Decals and https://www.muffwiggler.com/forum/vi...543feb691e8ff9 for excellent examples.

This should give me something like the quality that I want.. especially the baking aspect.
One warning. This print material does not take kindly to modern high-speed laser printers. They use high levels of heat (for faster printing). Lazertran lists laser printers that are acceptable on their website and there are companies which will provide a printing service at reasonable rates. It seems to be worth the effort as the results do look very good indeed.

forr 7th June 2016 05:13 PM

7 Attachment(s)
Almost finished, already working all right from the point of view of measures.
The case comes from my junk box, the front face, full of holes, needs cosmetic surgery.
Checking that everything was OK was a good opportunity to familiarize myself with Clio Pocket I purchased some time ago.

Self preamplifier,
'A low-noise preamplifier with variable frequency tone controls'
Linear Audio, volume 5, 2013-04
PCB by Carl Huff, built and measured by Forr
2016-06-07
--------------------------------------------------------------------------------
input signal 1 Vrms
R = Right, L = Left

TONE CONTROL
============

01. extreme frequencies and gains
иииииииииииииииииииииииииииииииии
bass lowest frequency, -10 dB -> red
bass lowest frequency, +10 dB -> white
bass central frequency, -10 dB -> green
bass central frequency, +10 dB -> yellow

02. central frequencies, extreme gains
ииииииииииииииииииииииииииииииииииииии
treble highest frequency, -10 dB gain -> red
treble highest frequency, +10 dB -> white
treble central frequency, -10 dB -> green
treble central frequency, +10 dB -> yellow

03. central and extreme frequencies, extreme gains
ииииииииииииииииииииииииииииииииииииииииииииииииии
bass lowest frequency, -10 dB +
treble highest frequency, -10 dB -> red
bass lowest frequency, +10 dB +
treble highest frequency, +10 dB -> orange

bass central frequency, -10 dB +
treble central frequency, -10 dB -> green
bass central frequency, +10 dB +
treble central frequency, +10 dB -> blue

04. comparison between channels, central frequencies, extreme gains
ииииииииииииииииииииииииииииииииииииииииииииииииии иииииииииииииииии
bass central frequency, -10 dB +
treble central frequency, +10 dB R -> red
bass central frequency, -10 dB +
treble central frequency, +10 dB L -> blue

bass highest frequency, +10 dB +
treble lowest frequency, -10 dB R -> green
bass highest frequency, +10 dB +
treble lowest frequency, -10 dB L -> orange

05. comparison between channels, extreme frequencies, extreme gains
ииииииииииииииииииииииииииииииииииииииииииииииииии ииииииииииииииииии
bass lowest frequency, -10 dB +
treble highest frequency, +10 dB R -> red
bass lowest frequency, -10 dB +
treble highest frequency, -10 dB L -> blue

bass lowest frequency, +10 dB +
treble highest frequency, -10 dB R -> green
bass lowest frequency, +10 dB +
treble highest frequency, -10 dB L -> orange

VOLUME CONTROL
==============

06. level differences between channels at various volume settings
ииииииииииииииииииииииииииииииииииииииииииииииииии иииииииииииииии
tone controls off

+10.2 R -> orange
L -> yellow

+4.8 dB R -> white
L -> sky blue

0.0 dB R -> red
L -> green

-4.8 db R -> white
L -> grey

-10.2 dB R -> purple
L -> blue

Tone control : when the pots are set to get a flat response, there was no significant level difference
(about 0.01 dB or less) when on or off.


PJN 7th June 2016 05:45 PM

Nice measures, I'm really enjoying mine, really nice piece of gear.

PJN

Carl_Huff 7th June 2016 05:59 PM

Nice job forr. Thank you!

And Kudos to Doug Self for making this available to the DIY community.


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