The E-LABOR needs also 115 VAC (= USA ) realized with
(a) ISOLATION-TRANSFORMER in a COOKIE-BOX ( Picture above )
(b) VARIABLE-TRANSFORMER ( Picture below )
... F O R F U N with CHILDREN of Friends & Neighbors,
these E-BUILDING-BLOCKS / "An Electro Technics Primer"
had planted the wish "to become also an ENGINEER" ...
... As HERAKLIDOS has said:
" Teaching is NOT filling Buckets - It has to SPARKLE MINDS !"