R2 is an ordinary 120 ohm 10% or better (use 5%) 1/4W resistor. They are available almost anywhere (except RadioCrap).In the schematic Andy provided Pulse Width Modulation 2
R2 is 120R 0.25W 10% or better. I don' t have that. Can I use a "normal resistor"? Which value then?
Also, I don't have mylar film or ceramic caps, can I use electrolytic instead?
Mylar film, poly film and ceramic capacitors are available almost anywhere (except ...).