I've been searching for a working soft start current circuit, my voice cards frequently lock up/start self oscillating on startup and I want to try this to see if it helps.
I found a working example on stack exchange, see KarlKarlsom's answer here: https://electronics.stackexchange.com/questions/294061/p-channel-mosfet-inrush-current-limiting
It is simulated here:
https://www.circuitlab.com/editor/#?id=n2hgzw3r66hb
Circuit cellar has a very similar design with explanation here:
https://circuitcellar.com/cc-blog/issue-304-eq-answers/
I created a version for -12V as well, with the help and misguidance of Claude Opus 4.6. Here is the result:
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Output from 2s square wave, red and blue are the outputs:
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