Thanks, I already understand the part why the PNP suddenly got itself turned off.audioguru said:Hi Freeskier,
You are very confusing because you don't attach the schematic that you are talking about.
You linked to an LED Flasher circuit but you seem to be talking about the flip flop circuit at the end of the page. Just copy then upload the circuit that you are talking about.
The charge on the capacitor stays for a while. When the transistor saturates and grounds the + end of the capacitor, then the - end of the capacitor is driven to a negative voltage which cuts-off the other transistor. Then the capacitor is slowly discharged by the 10k resistor then begins charging a little in reverse.
Now I'm building one, and actually, which is more important in influencing the LED blink rate? Is there a formula too for these?
edit: For the LED flasher, is it okay if I use CS9013 and CS9012 instead of the BC transistors? Found out in some hobby kits that they actually use these too. What do you think?