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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Building a Douglas Self design preamp
Building a Douglas Self design preamp
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Old 1st November 2017, 11:53 AM   #41
calpe is offline calpe  Gibraltar
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As Geoff mentions above: -

Farnell cable 6713 BK005 - Wire, Stranded, Hook Up, EcoGen™ EcoWireŽ, MPPE, Black, 22 AWG, 0.32 mm˛

22AWG wire = Dia. 0.0253 (in) - 0.644 (mm) - 0.326 (mm2)

24AWG wire would be: -

Dia. 0.0201 (in) - 0.511 (mm) - 0.205 (mm2)

Last edited by calpe; 1st November 2017 at 12:16 PM. Reason: add text
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Old 1st November 2017, 06:08 PM   #42
geoffw1 is offline geoffw1  United Kingdom
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Quote:
Originally Posted by calpe View Post
Thanks for that Geoff.

It would be interesting to view your Preamplifier?

Rear & Front panels and the wiring?
http://www.diyaudio.com/forums/attac...1&d=1509559583
http://www.diyaudio.com/forums/attac...1&d=1509559583
http://www.diyaudio.com/forums/attac...1&d=1509559583
http://www.diyaudio.com/forums/attac...1&d=1509559583
Attached Images
File Type: jpg front panel switches.jpg (401.5 KB, 296 views)
File Type: jpg rear panel.jpg (374.8 KB, 271 views)
File Type: jpg interconnect wiring.jpg (453.0 KB, 272 views)
File Type: jpg finished article.jpg (315.0 KB, 266 views)
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Old 2nd November 2017, 09:15 AM   #43
calpe is offline calpe  Gibraltar
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Great finish Geoff! Looks superb!

A few questions if you don't mind.

What case did you use?

What Mains power switch did you use?

How did you manage to drill the holes for the Rear Panel pcb's?

What monster do you have underneath the Preamp?

Any advise on the construction, wiring etc?

Thanks

Last edited by calpe; 2nd November 2017 at 09:35 AM. Reason: add text
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Old 2nd November 2017, 03:12 PM   #44
geoffw1 is offline geoffw1  United Kingdom
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Quote:
Originally Posted by calpe View Post
Great finish Geoff! Looks superb!

A few questions if you don't mind.

What case did you use?
It's the HiFi2000 Slimline 2U. It could easily have gone into something smaller but I wanted it to match the 100W power amp I was building at the same time.

Quote:
Originally Posted by calpe View Post
What Mains power switch did you use?
The front panel mains power switch is a Schurter MSM L19 2 pole single throw illuminated switch (Farnell o/n 1637578)

Quote:
Originally Posted by calpe View Post
How did you manage to drill the holes for the Rear Panel pcb's?
All the rear panel holes were done for me on a Water jet machine. The through holes (for knobs, switches and LED) were also cut on the waterjet machine. I had to drill the blind holes for mounting the front panel switch pcb on a pillar drill (thank you to my next door neighbour for use of it) and hand tapped them to suit M3 mounting posts.
I drew the panels up with a CAD package. I used LibreCAD 2D software at first, then switched to FreeCAD 3D software as my waterjet guy mentioned that most CNC machine shops prefer to receive 3D drawing. As a starting point for the panels, HiFi2000 have the case drawings available on their website.

Quote:
Originally Posted by calpe View Post
What monster do you have underneath the Preamp?
It's a 100W class B (Doug Self Load-Invariant design).
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Old 2nd November 2017, 04:15 PM   #45
calpe is offline calpe  Gibraltar
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I chose an Modushop by Hi-Fi 2000 | Contenitori per Elettronica | Electronic Enclosures | Hi Fi Chassis all black Dissipante case for the Elektor Q-Watt i built. 145W - 8 Ohms / 220W - 4Ohms. Great quality cases!

For the Elektor Preamplifier 2012 i down scaled the case and chose an RS | PF-19 Ventilated Rackmount Enclosure with Handles, 2U, 84 HP, 245mm Deep |

I recently took my case to a company to get it Water Jet Drilled. They are currently working on their AutoCad program and will advise next week.

Any advise you can pass on about the wiring and construction?
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Old 14th November 2017, 02:29 PM   #46
calpe is offline calpe  Gibraltar
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geoffw1, can you give any advise on how you hope to label your front and rear panels?

My case is black http://uk.rs-online.com/web/p/rackmo...36353737313926

Not too sure how i can do mine.
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Old 16th November 2017, 04:09 PM   #47
geoffw1 is offline geoffw1  United Kingdom
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Quote:
Originally Posted by calpe View Post
geoffw1, can you give any advise on how you hope to label your front and rear panels?

My case is black | PF-19 Ventilated Rackmount Enclosure with Handles, 2U, 84 HP, 245mm Deep |

Not too sure how i can do mine.
I used water slide transfers to do the labelling of the back panel. I tried this on a reject piece of front panel material but I (and especially the wife) wasn't happy with the results so I haven't labelled the front panel at all. It's not really a problem as once everything is set up to match power amp / speaker / room, the only controls being adjusted are volume (it has a larger diameter knob than rest) and the source select rotary switch.

If I was doing the panels again, I would get them engraved or laser printed at the same time as being CNC drilled.
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Old 8th January 2018, 11:22 AM   #48
calpe is offline calpe  Gibraltar
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I'm looking for something to label two black Powder Coated Aluminium panels.

Ideally, i'm looking to label the Volume, Balance, Input, Output etc.

Can anyone advise what i could use?

With thanks
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Old 2nd February 2018, 10:20 AM   #49
calpe is offline calpe  Gibraltar
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I have finally been able to get back to this project build after so long.

Can anyone please give me any advise and steps that i should take and be aware of when doing the wiring?

Are there straight forward guides available of all the connections, including the d.c. connections?

With thanks
Calpe
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Old 2nd February 2018, 10:55 AM   #50
geoffw1 is offline geoffw1  United Kingdom
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Quote:
Originally Posted by calpe View Post
Can anyone please give me any advise and steps that i should take and be aware of when doing the wiring?

Are there straight forward guides available of all the connections, including the d.c. connections?

With thanks
Calpe
Wiring list is attached. Lengths and colours are what suited my case /internal board positioning.
Wire size, headers, crimps I used are detailed in previous posts (#35 - 39, if I remember correctly).
Interconnect.pdf
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