F5X -- the EUVL Approach - The Build Thread - Page 4 - diyAudio
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Old 4th April 2012, 06:53 AM   #31
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Hi Westley,

Thank you for bringing this to our attention. This is the only error we are currently aware of from the original BOMs posted in the main thread.

We are reviewing the power BOM and Cascode options BOM among the group and will post them here once review is complete. We have also reached out to the moderators to remove the BOMs from the original thread so that this will be the only source for the BOM to minimize confusion.

For reference I want to point out the the BOMs in this thread are revision controlled. The "1.0D" indicates that the BOM is for PCB revision 1.0 and it is the D or fourth incremental version of the BOM. Future changes if necessary will increment the letter only. If the PCB were to change for some reason, the "1.0" would change in the BOM title to match.


I appreciate everyone's patience as we better understand the implications and potential pitfalls of supporting a major project here.

Dave
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Old 4th April 2012, 01:55 PM   #32
Westley is offline Westley  United States
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The only other question I have spotted is on the regulator boards, a 18V, 500mW zener is specified. The supplied part # is for a 5.1V, 500mW zener.

Quite a project undertaking. Thanks to all.

Rick
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Old 4th April 2012, 02:26 PM   #33
Westley is offline Westley  United States
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One final question. Should R14A, R15A, R27A, R28A be 1K ohm as R14B,R15B, R27B, R28B will be determined and replaced after the bias is set?
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Old 4th April 2012, 04:49 PM   #34
Horio is offline Horio  United States
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Quote:
Originally Posted by Westley View Post
One final question. Should R14A, R15A, R27A, R28A be 1K ohm as R14B,R15B, R27B, R28B will be determined and replaced after the bias is set?
I was wondering this too, when I started to populate the boards. It seemed like it might be backwards in the BOM.

Last edited by Horio; 4th April 2012 at 04:51 PM.
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Old 4th April 2012, 05:36 PM   #35
EUVL is offline EUVL  Europe
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I do not have the Gerber next to me, so I cannot check the suffix a,b,c.
But next to the Trimmer, there are space for 2 resistors.
One should be 1k (R14b in BoM), the other 1.5k (R14c in BoM).

And when you are done with adjusting output bias, you may (but do not have to) replace the trimmer by a fixed resistor of the same value.
For Mark (who is less skilled in electronics), I left the trimmers on.

Hope it is clear.

Dave will clean up the mistakes later. Apologies.


patrick
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Last edited by EUVL; 4th April 2012 at 05:39 PM.
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Old 4th April 2012, 05:52 PM   #36
Horio is offline Horio  United States
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Thanks Patrick. No apologies necessary. This is all part of the beta building process.
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Old 5th April 2012, 09:03 PM   #37
alazira is offline alazira  United States
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Quote:
Originally Posted by Westley View Post
The only other question I have spotted is on the regulator boards, a 18V, 500mW zener is specified. The supplied part # is for a 5.1V, 500mW zener.

Quite a project undertaking. Thanks to all.

Rick
Hi,
I can't find the regulator board BOM. Can someone point me to its location?
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Old 5th April 2012, 10:45 PM   #38
EUVL is offline EUVL  Europe
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Please give fitzfish a chance to tidy things up.
He will post everything in this thread after correcting any errors.


Patrick
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Old 6th April 2012, 08:28 AM   #39
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All,

The moderators were kind enough to remove the original pre-release BOMs from the main thread. Thank you. This will now be the only source for this information and hopefully will avoid some confusion down the road.

The updated power supply BOM is attached.

Dave
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File Type: pdf F5X_Power_BOM_1.0D.pdf (23.7 KB, 383 views)
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Old 6th April 2012, 08:30 AM   #40
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All,

One cascode option has been tested by a test team member to ensure the PCBs are correct. Other cascode types have not yet been tested. We also have not measured or done any comparative critical listening to know if a cascode is worthwhile on the standard build with 16V rails. Because of this and our desire to "do no harm" we will not be publishing the BOM or other details until we have it completely checked out.

Dave
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