Failed repair of a salvaged MikroTik RouterBOARD 750GL.
I repaired a pair of salvaged speakers.
Testing a PAM8403 Class-D amplifier module with a pair of salvaged speaker drivers
Salvaging 18650 li-ion cells from dead battery pack of a laptop.
My previous post about the Mystery Transformers wrongly assumed which ones were the primary and secondary windings.
I bought two used transformers. They were broken.