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0039 Current Source Power Supply Hack



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Pete modifies a Longwei power supply to make a 5A, 32V variable current source instead. Along the way fixing the dangerous wiring and protective earth and adding current/voltage previews and output isolation.
Not bad for 3 op amps and a tiny perfboard. After testing Pete discusses the impact of the opamp choices
See the supply in use https://youtu.be/RxdziO7kb8Q

00:00 - Intro
00:16 - recap the review
01:28 - Overview - sketches, as-is
04:00 - The plan
08:16 - Set-points on display not just actuals
11:12 - Need measurements
13:13 - The data found
14:00 - The build and review schematics and simulation
25:06 - Buzzing out
25:37 - power-up and add op amps one by one
25:58 - First test and thoughts
27:31 - Op Amp choices and implications
31:06 - Here it is finished and working (ok so board hanging out)
31:09 - safety improvments etc
31:42 - it didn't fit!
32:19 - possible improvments and precision improvments
36:06 - wrap-up, summary and outro

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Related Information

The teardown and review https://youtu.be/VGTBzYbCbo4
https://odysee.com/@MOR:9/Teardown-Longwei-LW-K305D-power-supply-lbry:a
Guthub with Microcap simulation files (schematic) https://github.com/pshersby/longwei-current-source-mod

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