Available in blue, red, green, and yellow, a family of LED panel monitors can replace incandescent lamps in 120-Vac applications. The IP67-rated 3- and 5-mm devices fit in holes ranging in size from 0 ...

144 LEDs total. Three sets of 48 in series connected in parallel. My problem is I don't know what value to use for R1. I'm thinking 600 ohm, but I really don't know how to calculate this. I'm making ...

MR16 halogen lamps normally operate from a low-voltage AC source typically generated by a low-frequency AC transformer or by a high-frequency electronic transformer. In most MR16 applications, the ...