This is a re-work and size change of an original portable power supply by WB2CBA (https://antrak.org.tr/blog/usdx-sdr-ssb-sota-transceiver-battery-pack/).
It is done to fit the PSU into the same size enclosure as uSDX SOTA transceiver itself: https://a.co/d/9v3JyBe
In fact, this complete unit can be used for any purpose where 12V battery supply is needed, from that perspective it is universal.
The design was slightly modified to use different BMS unit, as the original one that Barb used is not easily available anymore. This is the example of the new BMS unit used (from Amazon): https://a.co/d/hkYq5Yx
Also, I used THD version of 18650 battery holders because they fit the new squeezed PCB design. THD Version example: https://a.co/d/5E8u6dR
Digikey version: https://www.digikey.com/en/products/detail/keystone-electronics/1043/2745669
Along with PCB versions of front and rear panels for the enclosure I am adding STL variants for those who want to print them on a 3D printer.
I designed the flex bracket to attach PSU to the tranceiver, STL file is included. I myself used two brackets. They should be printed with TPU filament, I used Praline TPU, very easy to print, does not have to be super flex.
Many thanks to Barb (WB2CBA) for sharing original KiCad files that made this job possible.
Enjoy and 73!
Sardar (AC8L, 4K6SA).
