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Second GB "Little Helpers"
Second GB "Little Helpers"
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Old 6th October 2017, 07:04 AM   #1
JPS64 is offline JPS64  Germany
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Second GB "Little Helpers"
Default Second GB "Little Helpers"

Here two "Little Helpers" boards IŽll order end of next week.

If someone is interested?

JP
Attached Images
File Type: png SMPS-FILTER.png (662.2 KB, 468 views)
File Type: png DC-BLOCKER_001.png (940.1 KB, 463 views)
Attached Files
File Type: pdf SMPS-FILTER_SCH.pdf (14.5 KB, 62 views)
File Type: pdf SMPS-FILTER_PCB.pdf (60.4 KB, 20 views)
File Type: pdf SMPS-FILTER_TOP.pdf (14.4 KB, 11 views)
File Type: pdf SMPS-FILTER_BOT.pdf (15.3 KB, 14 views)
File Type: pdf DIY-LH-NR002_SCH.pdf (18.2 KB, 61 views)
File Type: pdf DIY-LH-NR002_PCB.pdf (17.9 KB, 14 views)
File Type: pdf DIY-LH-NR002_PBA.pdf (19.1 KB, 11 views)
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Old 6th October 2017, 07:30 AM   #2
potepuh is online now potepuh  Slovenia
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And the price is?
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Old 6th October 2017, 07:38 AM   #3
JPS64 is offline JPS64  Germany
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Second GB "Little Helpers"
Estimated for 2mm thickness, 2 oz Cu < 6EUR without shipping (30 pcs batch).

JP
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Old 6th October 2017, 09:19 AM   #4
levistubby is offline levistubby  United Kingdom
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This is a prime example of a thread title being totally useless.
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Old 6th October 2017, 04:25 PM   #5
bk856er is offline bk856er  United States
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Second GB &quot;Little Helpers&quot;
JP, if you're taking requests it would be great to have a little board to retrofit a three-element CRC snubber near the transformer for PS designs that don't already include that. Part values would come from the popular Quasimodo jig: Simple, no-math transformer snubber using Quasimodo test-jig


BK
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Old 6th October 2017, 04:51 PM   #6
JPS64 is offline JPS64  Germany
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Second GB &quot;Little Helpers&quot;
@bk856er

simple sketch on paper should be helpfull (Quasimodo jig is a long thread).

JP
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Old 7th October 2017, 10:53 AM   #7
JPS64 is offline JPS64  Germany
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Second GB &quot;Little Helpers&quot;
CRC Snubber...

JP
Attached Images
File Type: png CRC-SNUBBER_PCB.png (183.0 KB, 353 views)
File Type: png CRC-SNUBBER_001.png (598.6 KB, 341 views)
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File Type: pdf CRC-SNUBBER_V1.pdf (13.6 KB, 23 views)
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Old 7th October 2017, 11:12 AM   #8
wintermute is offline wintermute  Australia
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Second GB &quot;Little Helpers&quot;
Quote:
Originally Posted by levistubby View Post
This is a prime example of a thread title being totally useless.
Agree!! Hopefully I've now made it at least a little more meaningful, though I'm not 100% certain on that....
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Old 8th October 2017, 08:02 PM   #9
bk856er is offline bk856er  United States
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Second GB &quot;Little Helpers&quot;
Quote:
Originally Posted by JPS64 View Post
CRC Snubber...

JP


Nice! The trimmer might be a bit superfluous, but doesn't occupy much space if someone doesn't want to populate it. Quick scan of the recommended EPCOS B32529 caps at Mouser doesn't show any parts longer than 7.8mm and all are 5mm LS, so perhaps that overall footprint could be scaled back. MJ's two suggested values are ~3mm wide. Only my $0.02...


Would it unwise to mount the PCB at the large center bolt used for the typical toroid? Always seems to be some free vertical space there, at least in my builds, and it gets the snubber close to the transformer which is more optimal. And sometimes dual secondary transformers.


BK
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Old 9th October 2017, 08:34 PM   #10
JPS64 is offline JPS64  Germany
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Second GB &quot;Little Helpers&quot;
... CRC Snubber modified, mountig hole added.

JP
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File Type: png CRC-SNUBBER_PCB_002.png (247.1 KB, 243 views)
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