Then why bother with a specialised IC when a cheap comparator and transistor will do most of the time?
Here's a version made with discrete components, it' isn't as efficient but it's cheaper.
I don't understand the question or how it relates to this circuit.
What do you mean collapse a coil? A sledgehammer will easily do that.
It's possible if you make a couple of modifications, you can either lower the reference voltage or reduce R1. R2 needs reducing to allow enough current to saturate Q1.
Your best option is to use a comparator with a push-pull output and a MOSFET.
If you must go for a BJT then use a good quality one like the ZTX753 or the 2SA1943. It needs to have a low saturation voltage, high beta at 1A and fairly fast Ft >20MHz.
Hi,
I just googled and came to know that switched mode power supply for LEDs is much efficient than directly hooking them up with powr source and LEDs are much brigher as well. I was looking for switched mode LED driver circuit and saw this thread
I have an LED pannel in an emergency light in which 60 LEDs are connected in parellel, they are driven through a 6 volt 4.5AH battery with one 2ohm 5watt resistor in series. They best operate when 1A current is flowing.
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