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

Doug Self Preamp from Linear Audio #5
Doug Self Preamp from Linear Audio #5
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Old 8th February 2016, 05:01 AM   #421
cobar53 is offline cobar53  Australia
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Default Power Supply Resistors

Unless dyslexia has struck, I seem to have a difference between the Power Supply BOM and the Board.
Namely, the BOM refers to 12k resistors for R7 and R8.
My Board has positions for R7 and R6. It looks like 6 is 8

Wayne
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Old 8th February 2016, 05:13 AM   #422
Carl_Huff is offline Carl_Huff  United States
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Quote:
Originally Posted by cobar53 View Post
Unless dyslexia has struck, I seem to have a difference between the Power Supply BOM and the Board.
Namely, the BOM refers to 12k resistors for R7 and R8.
My Board has positions for R7 and R6. It looks like 6 is 8

Wayne
Yup, evidence of how late some of my nights have been! Resistors 6 & 7 on the PCB are both 12K.
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Old 8th February 2016, 06:50 AM   #423
jan.didden is offline jan.didden  Europe
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I can't agree to that. If you check all dimensions from the plug data sheet, measure carefully the distances on the PCB (which I must admit is easier if you lay out the PCB yourself, then you can measure in the CAD) it's not that difficult.

Front Panel Express has predefined hole patterns for connectors and you can position them extremely accurate.

In my case, it ALWAYS comes out exactly as it should. YMMV

Jan
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Old 8th February 2016, 02:42 PM   #424
DualTriode is offline DualTriode  United States
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Smile A screw in every hole.

Jan,

It is like assembling an Ikea chair. You know that all the parts fit together, however you do not tighten any of the screws until there is a screw in every hole.

DT
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Old 9th February 2016, 03:09 AM   #425
Halauhula is offline Halauhula  United States
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We really should develop a pdf resource of construction hints, including case layout and machining, and mechanical assembly. What forum would this be best posted in? Tools and techniques?

I would be willing to post an draft outline, and the text could be done in a wiki fashion, with people contributing, but DIY Audio would have to agree.
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Old 9th February 2016, 08:29 PM   #426
sasha70 is offline sasha70  United Kingdom
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Good evening all.
Sorry for silly question, just would like to confirm.
I saw a post by Terry about C47L and C47R capacitors, but cant find this cap on schematic,
Is it marked as C21 on volume-control schematic?
Could you please confirm it is 220uF 35V, mouser No 647-UES1V221MHM, same as C15, C18, C19?
Best regards.
Sasha.
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Old 10th February 2016, 04:47 PM   #427
mik000000 is offline mik000000  Canada
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got my IO board. thanks Carl

on an unrelated question, if i want a line out for a sub woofer, do i tep into the regular output? does this cause a problem?
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Old 10th February 2016, 04:48 PM   #428
georgebrooke is offline georgebrooke  United Kingdom
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Location: Cambridge, UK
Default Me too

Hi Carl,
Arrived yesterday and looks great.... will start soon

George
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Old 10th February 2016, 08:47 PM   #429
sasha70 is offline sasha70  United Kingdom
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Good evening all.
Another silly question about C40L and C40R.
I have PCB v1.2d,
According BOM C40 is 470 uF @35V 12,5mm dia x 5mm LS but on PCB LS is 7,5mm.
My question: can I use Bi-Polar capacitor, same as C8 and C16 (Mouser No 647-UES1V471MHM)?
Best regards.
Sasha.
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Old 11th February 2016, 06:02 PM   #430
drpro is offline drpro  United States
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Doug Self Preamp from Linear Audio #5
A question for Carl, I am still waiting on a longer ribbon cable for the input selector. If that is not connected will the preamp default to input one or do I need to wait on the cable.
Thanks
David
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