It's DIY so I'm not expecting it to be particularly fast, but do you have any hashrate figures on these self-built stuff?

I'd be content if it can pump a few hundred GHash/s. It's ASIC tech after all, even USB miners with small chips can output such speeds.

hi nullama!

I saw your reply over on reddit. I'm not sure why r/BitcoinMining is deleting legit posts -- that's pretty annoying.

I was banging my head the last few days as to why the bitaxe was only working erratically. I finally got it under the microscope and discovered that the pin pitch on the PCB footprint I had made was 0.03mm off from the actual chip. Doesn't sound like much, but it really looks like a few of the BM1387 pins were not making contact. I have fixed this, updated the GitHub repo and ordered some new PCBs to give it a try.

I think it would be amazing to make this work with the BM1397! It looks like the BM1387 and the BM1397 have the same chip package size and pin configuration.

Does anyone know if the BM1387 and the BM1397 pinout is the same?

That's so crazy. I carefully measured it, and then just assumed I was off and it was really 0.45mm. oops! I've ordered a v2 PCB with the footprint changed to 0.48mm -- hopefully that works. It's also a tricky DFN package because the pins don't extend all the way to the side, so you can't see if it's soldered correctly.

I don't suppose you have a pinout for the BM1397? Has anyone made one of those poorly translated "repair guides" for the S17?

No worries! Thanks for your help so far.

The Compac F looks really sweet, BTW. I can't help but notice there are a lot of them for sale on eBay for $300+ in essentially unopened packaging... That's the same price a 13.5TH Antminer S9 goes for. People are craving this home bitcoin mining experience.

I’m glad to see the miner pricing falling a bit! Hopefully that will get this scalping that has been happening under control..

I found the S17 repair guide that sidehack mentioned. I've put together a BM1397 version of the bitaxe -- the bitaxeMAX?? naming things is hard. Check it out and let me know what you think; https://github.com/skot/bitaxe/tree/pro

I haven't gotten PCBs back to test yet, so be careful!

I think a double, or even a triple BM1397 miner would be sweet! I’ll give it a try once I verify that the single works.

I've mentioned this in another thread here some time ago, but given this is a new hardware project from scratch it might be worthwhile repeating it here.

It would be interesting to use a USB-C connector for the miner. This would allow a lot more power to be delivered, using the standards, and not relying on non-standard power delivery like the current generation of USB miners.

There are some chipsets that might make this a bit easier.

For example from Texas Instrument: https://www.ti.com/interface/usb/type-c-and-power-delivery/overview.html



You could get 3A@5V (15W) without dealing with power delivery.

I finally got the PCBs back from the fab and got a chance to build them up yesterday. It looks like the new footprint is good! The BM1387's are mining nicely..