When I complete my rebuild I had no time to test all parts of it and I recently found out that my speaker is not working. I also could not find original schematic from which I copied part for speaker and I was unable to make it work in any way, so I decide to make new revision.
This revision is completely same as first one, except buzzer instead of speaker and few diodes which were not needed.
Here as small test of it (sorry for bad video quality):
FW need a lot of work as for now, there is not much what it can do.
As i have some spare boards, I will probably try to sell them on Tindie, so if anyone is interested look there or send me a message.