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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Old 13th July 2018, 03:32 AM   #131
funch is offline funch  United States
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I vote for separate.
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Old 13th July 2018, 03:53 AM   #132
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Yes, separate BOMs would make things clear, but is more work for Jwarch. Let me and JP know if you have any questions about a particular part. I am terrible at making BOMs because 90% of the stuff I have on hand in my drawers already or I grab the nearest alternative. There are some specific things for the PSU of this amp though that are not run of the mill items, like the 4uV LDO voltage regulators and dual rail DC-DC converter. I am really excited about this PSU, and can see how it can be useful for a lot of other preamp/HPA projects as it presents a convenient way to get ultra-clean (battery-like) dual rail +/-18v power at moderate current of 310mA from a 12v wall wart.
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Old 13th July 2018, 05:09 AM   #133
jwjarch is offline jwjarch  United States
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Thanks for the vote funch. I would agree with the separate BOMís but I havenít populated all the parts yet from the initial list. Once I have that done Iíll see how much extra work it is to separate and back check each BOM.

Thanks X. I think Iíll have a few questions once I get to the last 10-15 parts. I have to say though, Iíve been getting pretty good at this BOM stuff over the last year or so. So good that I have parts lined up for about 10 projects now.
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Old 13th July 2018, 01:25 PM   #134
yourownbuzz is offline yourownbuzz
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This was in this month's electronics magazine. Didn't search up the cost of the Ics but the title was "using two cheap ICs to generate +-15V" (intended to be used for amps).
What do you guys think?
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Old 13th July 2018, 04:42 PM   #135
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Quote:
Originally Posted by yourownbuzz View Post
This was in this month's electronics magazine. Didn't search up the cost of the Ics but the title was "using two cheap ICs to generate +-15V" (intended to be used for amps).
What do you guys think?
Thanks for this - sort of what JP and I were already thinking. We have in fact, implemented the following in another project as a +15v source, and were looking to make a dual rail version. I did not know that you can the output of two units from same input to get a dual rail. The output must be isolated from the inputs for this to work.

Simple High Performance DC Coupled Class A HPA with sub PPM THD-dc-dc-15v-converter-png

The PCB's have completed manufacturing and have been shipped. I should have them by Monday.
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Last edited by xrk971; 13th July 2018 at 04:47 PM.
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Old 13th July 2018, 06:45 PM   #136
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
JPS6 4 just found this nice +/-15v DC-DC design from TI:
http://www.ti.com/lit/df/tidreq7/tidreq7.pdf

BOM is about $14 ea.
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Old Yesterday, 01:54 AM   #137
yourownbuzz is offline yourownbuzz
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cool! would either of those designs be suitable for this amp? Presumably with some tweaking the output of the 15V designs could be increased to match the 18V of the already designed PSU..?
Just seeing if there's other options for a PS from single rail.
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Old Yesterday, 06:29 AM   #138
jwjarch is offline jwjarch  United States
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Default SHPA BOM - First Pass - DO NOT USE YET

Hi X,

Here's the first pass on the BOM for your review. I took a few liberties here and there. Also a few things have already gone out of stock in the last two days. I have already selected comparable components in most cases. The items in RED need still need some attention. Also, this is the full BOM. It has not been separated yet.

-Jon
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Last edited by jwjarch; Yesterday at 06:59 AM.
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Old Yesterday, 07:36 AM   #139
icsaki is offline icsaki  United States
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xrk971: I'd like a pair of boards if they are still available.
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