i've successfully built a O_C T4.1 based on o_c_3_cpu_new_jlc.zip and o_c_3_analog_new_jlc.zip, so many many thanks for your contribution to this project ! i fully understand you need a break now and hope that someone in the community is willing...
Final followup to this old thread.
O_C T4.1 was released as open source with everything for DIY building in February 2025.
In August 2025, the design was converted to KiCad by Beau Seidon, and a zener diode (D6) was added to protect against...