skipped reading the silkscreen … it says Q1 on the lowermost package but the other three are diodes. so could also be a forward converter or something similar.
user134450
joined 2 years ago
no i was just adding that to explain that grub needs special steps to work with secure boot enabled. if secure boot is off you can ignore that part.
i searched for the exact phrase used "robot which uses plasma torches" and found a few news articles for a start-up that uses such a concept in commercial tunnel drilling.
so i guess we do have tunneling robots that use plasma torches.
is secure boot enabled in the firmware? ~~It is possible that you have a signed grub binary installed but the module signing is not yet rolled out.~~ Edit: my mistake: if you are using grub with shim then all the necessary modules need to be baked into the grub binary. maybe grub was not installed correctly?
indeed it looks like a Royer oscillator in there (because there are transistors before AND after the transformer).
i did not see any text that mentioned the guided variant but i saw a video that showed supposedly a UA gunner in a PzH2000 with a programming adapter on a shell like they are used with Vulcano ammo. (looks like a round copper ziggurat)
Edit: just read the description of those shells by the manufacturer and i i think i misunderstood programmable shell to mean guided shell. the programming could also be for setting the fuse.
They have guided Vulcano ammo in that caliber too.
i think the mine was successfully removed. so, mission accomplished?
just found this post: https://mstdn.social/@deaidua/111308908881071433
so they are possibly Sonobot 5's
Acording to the datasheet the TDA7294 uses -V~s~ and +V~s~ in the block diagram so i would assume it is intended to be used with DC power. If the module is specced for use with AC as well as DC, then this just means what you already suspected: it has an integrated bridge rectifier and most likely some sort of low pass for the rectified power (read: a bunch of big capacitors).
You could just go with a big transformer core that powers them all at the same time; many commercial amps do that and it works fine in general, provided you have enough margin for power spikes and the modules will not influence each other when connected in parallel to power.
In my opinion using separate transformers would be paranoid but it would work of course.
Edit: dont forget that this thing will produce heat. If you really go with an 800W transformer then you have to be able to cool about 400W in the worst case (going by the data sheet power dissipation of the chip and assumed transformer + rectifier efficiency of 90%).
instead of putting a grub config in /boot/grub you could also try embedding it directly with grub-mkimage. you would need to point to the grub config that you have with -c and add all the needed modules as extra arguments at the end.
it is possible that the grub image you installed is just not looking for the config file at the right place.
or maybe try putting the grub.cfg in the same directory as the grubx64.efi