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If I understand how relay coil behave during turns off time. The inductor " kick" voltage cannot be greater than -Vcc.You definitely do need D1 as it will prevent T1 and LED2 from overvoltage when the relay turns off.
How did you come to that conclusion? The shorter the turn off time, the higher the kickback voltage.If I understand how relay coil behave during turns off time. The inductor " kick" voltage cannot be greater than -Vcc.
After T2 and T3 "SCR" is trigger, the voltage at T1 base drops to almost 0V. So the relay coil tries to keep the current to flow in the same direction as before.How did you come to that conclusion?
The relay coil resistance is 390ΩHow much current flows through the relay coil? Is LED2 capable of withstanding that much current?
Can you explain how is is passable. Can you point where I make a error in analysis show in post 6?Sure looks like LED2 is vulnerable to getting zapped by the inductive kick without D1.
YesWill the relay pull-in reliably with only ~9V across it?
Inductive load and a current spike ?There is a huge current spike through T1 when it turns on.
Switch-off power supply.What resets it?
Can you show a better solution for 10A surge current (car battery charger).I dont like it because it wastes a lot of power forever waiting for something to happen.
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Can you show a better solution for 10A surge current (car battery charger).
Most of our cars have automatic lights.Well, in my country once a year we have a winter. Also we must drive our cars with the lights on all year round.
And sometimes we simply forget to turn off the lights after we turn-off the car.