[PTC resettable Fuses problem]

 

 Time plays a big factor with PTCs;

26. Recovery time: The recovery time after PTC thermistor action should not exceed 60S.

see: https://www.ntcsensors.com/Technical_parameters_of_PTC_resettable_fuse/#:~:text=Under limited conditions%2C the highest voltage that the,may be broken down and cannot be recovered.

Also there is an interesting video that discusses PTCs here: https://www.youtube.com/watch?v=eeaqyD3ZYjI/geometry dash

Thank you for sharing!

[DIY - NodeMCU Development Board]

Thanks for the information. It really helped me!

fireboy and watergirl

[Electronic flourescent tube starter]

 

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/drift hunters

I will look at the circuit some more.

Thanks!