I don't use primary optics which are not made by myself.
9 Integrating battery and battery charger with my project - I never want to remove batteries from this device for charging, how do I do that? mar 23 '12
4 Home-built machine: how to make the 110 V AC electrical installation part “by the book”? (safety, “code”) oct 29 '13
3 circuit breaker for 1/4 HP 115V AC motor? aug 13 '13