I have not really reflected over required specs, but I ordered TO263 packaging (without actually realizing). It is a bit big, but it works fine and I was able to mount it by cutting/modifying its pins. I ordered this:
https://a.aliexpress.com/_mrw0AGb
He-he, came to think about that name while I was exercising on my bike in the rain😉 I’t not a Klarstein, but I suppose they are not that different. This is a BB30 Automatic, that I believe was maybe just sold in Norway. I bought it with broken electronics for this purpose. You can see it here:
Yes, I obviously replaced the very minimalistic all-in-one electronic board (with on-board PSU and relays) with a separate 12V PSU and 2 SSR relays, whereof the one to the heating elements is with heat sink. I fixed it all to the side of the base. I’m still connected to the physical pump switch...
I just finalized BrewManiac for my all-in-one system, and I have connected 2x 1250w elements in parallel. It was however just finalized, so I have not been able to test it yet. If you decide to do it, I have created an enclosure to be 3D-printed. You can find this here: BrewManiac Control Box by...
To close this, I did find the resolution. I used the wrong port PCF8574AP port expander, but replaced it with PCF8574N. Both were purchased as PCF8574P on AliExpress and EBay, but the actual versions were different. I believe the addressing between the circuits differ.