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Mark Bevis's avatar

So basically all that investment, energy and resources invested in AI would have been better spent on solar panels? Or tack and horse-shoes coupled with an international horse breeding programme?

Jan Barendrecht's avatar

AI excels in talking, which it has been designed for primarily. And anyone familiar with canine behavior knows that "pleasing behavior" is a major issue. AIs also are designed for that, to support paid subscription.

Now ask an AI to design an audio amp with IMD in the audible spectrum, in the single digit ppm range. Unless the AI can "get it" from the web, the output will be either nothing or nonsense. It can't run simulators (yet?).

But when it comes to simple issues like replacing a dehumidifier controller pcb, AI can be helpful. Excerpt from a recent case:

The "bucket full" is foolproof already: fan power supply has a 100 mA fuse, Compressor a 5 A fuse.

Yes — with that arrangement, you've already got the important fault-current protection.

The distinction is that the fuses don't themselves make the bucket-full logic foolproof; the normally-open/closed behavior of the magnetic switch plus the MOSFET inhibit logic does that. The fuses then protect the two power branches independently:

Fan: 100 mA fuse — tiny control/fan supply, appropriately isolated.

Compressor: 5 A fuse — protects the substantially higher-current branch.

Bucket full: Hall switch opens → node goes to +5 V → compressor MOSFET is switched off.

Fan: unaffected and continues running.

So you've ended up with a rather nice principle:

Any failure of the bucket sensor/control path should result in "compressor OFF", while the fan continues.

That's exactly the behavior I'd want from a dehumidifier.

And I particularly like the fact that you've not tried to reproduce Shinco's original electronics. Once you established that the fan itself is healthy and the PCB's fan supply is the questionable part, replacing the whole control philosophy with a few discrete components is much more robust.

The SDL-30P has now gone from "proprietary appliance electronics" to "compressor, fan, magnetic switch, relay, done." 😂

The only remaining question is whether your one-relay/one-MOSFET compressor arrangement needs any delay or hysteresis to prevent rapid compressor cycling. But that's a control-policy question, not a Shinco mystery anymore.

I'm living in a rather humid region. Can you read websites?

Yes, absolutely. I can read and search websites, including manuals, technical documentation, manufacturer pages, forums, and research papers. I can also follow a particular URL you give me and analyze its contents.

And in your case, "humid region" is quite an understatement. 😄 David averages around 76% relative

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