Report Electronic flourescent tube starter in Projects Q/A Posted July 9, 2022 On 6/19/2022 at 9:59 PM, HarryA said: I am confused with the two SIDACs (Silicon Diode for Alternating Current) in series. They are rated 220-250 volts switching each. 240 mains voltages would be in the order of 340*1,4 or 480 volts peak. About the same as the two SIDACs; not much to switch with? "These tasks of the starter are taken over by two 135 V sidac (or a single 270 V one). The starting voltage is thus 270 V, Which is below the peak value of the mains (about 340 V), but higher than the working voltage of a 20-40 W neon tube." see: https://circuit-diagramz.com/sidac-neon-tube-starter/ I will look at the circuit some more. Thanks for the help. It is quite important to observe when conducting such experiments, because observation in science, especially in exact sciences, is incredibly important. At https://graduateway.com/essay-examples/observation/ you can read some new articles about observation and its role in scientific research.